Sharp Stakes Calculator

How does the Sharp Stakes Calculator work?

The Sharp Stakes Calculator lets UK punters enter odds, stake, market type and optional adjustments to instantly see returns, profit, implied probability, overround/no‑vig values and optimal stake sizing. It supports UK‑standard fractional odds by default, plus decimal and American formats, and handles each‑way settlement, football markets (including Asian handicap and totals), exchange commission, Tattersalls Rule 4 deductions and dead‑heat ties. Results are shown for win, push and loss paths where relevant, with rounding to the nearest penny.

• Choose odds format (fractional, decimal or American) and enter your price.
• Select market type (e.g., Win, Each‑Way, 1X2, DNB, Over/Under, Asian Handicap) and your stake.
• Optional: add commission (%), Rule 4 deduction (pence per pound) and any dead‑heat factor.
• Review gross and net returns, profit, implied probability and (if enabled) EV/Kelly stake suggestions.

What odds formats, each-way, and football markets are supported?

The calculator accepts fractional (UK), decimal (EU) and American (US) odds, auto‑converting between them and showing implied probability. Each‑way is fully configurable (places and place‑fraction such as 1/5 or 1/4). Football markets cover 1X2, Draw No Bet, Double Chance, Both Teams to Score, Over/Under (including push lines), and Asian Handicap (including quarter‑lines like ±0.25 and ±0.75 with half‑win/half‑loss settlement).

Format	Example	Conversion	Implied Probability
Fractional → Decimal	3/2	1 + (3 ÷ 2) = 2.50	1 ÷ 2.50 = 40.00%
Decimal → American	1.80	−125 (since 1 + 100 ÷ 125 = 1.80)	1 ÷ 1.80 = 55.56%
Fractional ↔ American	9/4	Decimal 3.25 ⇒ +225	1 ÷ 3.25 = 30.77%
Even money	1/1	Decimal 2.00 ⇒ +100	1 ÷ 2.00 = 50.00%

• Each‑way: enter total stake or per‑part stake. The calculator splits the bet into equal win and place parts, applies your chosen place terms (e.g., 1/5 or 1/4 of the win odds) and the exact number of places, then settles each part independently.
• Two‑way football markets: BTTS, Over/Under (2.0, 2.5, etc.), and DNB include push handling where applicable (e.g., O/U 2.0 or AH 0 ➝ stake refunded on a draw/landed total).
• Asian Handicap: supports whole (±1.0), half (±0.5) and quarter lines (±0.25, ±0.75). Quarter lines split the stake across adjacent half‑lines (e.g., −0.25 = half on 0, half on −0.5) to yield half‑win/half‑loss or half‑push results as appropriate.

Football market	Outcomes	Settlement notes
Match Result (1X2)	Home, Draw, Away	Three‑way; no pushes.
Draw No Bet (DNB)	Home, Away	Stake refunded on draw (push).
Double Chance	1X, 12, X2	Wins if either of the two selected outcomes occurs.
Both Teams To Score	Yes, No	Two‑way; no push.
Over/Under 2.0	Over, Under	Push if exactly 2 goals (stake returned).
Over/Under 2.5	Over, Under	No push line.
Asian Handicap 0	Home 0, Away 0	Push on draw; otherwise settled as win/loss.
Asian Handicap −0.25 / +0.25	Two‑way	Stake split across 0 and ±0.5; draw can lead to half‑push/half‑loss or half‑win.
Asian Handicap −0.5 / +0.5	Two‑way	No push; equivalent to “win the match” with draw as loss for −0.5 backers.

Can I enter commission, Rule 4, and dead heats?

Yes. You can model exchange commission as a percentage of winnings, apply Tattersalls Rule 4 deductions on win profits when there are withdrawals, and settle dead‑heat outcomes by precisely reducing the winning stake share. The calculator shows both gross and net figures so you can reconcile to your bookmaker or exchange statement.

• Commission: enter a percentage (e.g., 2%–5%). Net decimal odds are computed as 1 + (Decimal − 1) × (1 − commission). Commission is applied to profit only, not the stake.
• Rule 4: enter the deduction in pence per £1 (e.g., 20p/£). The deduction is applied to win profits only; net return = stake + (win profit × (1 − deduction)). Bookmaker Rule 4 bands vary by withdrawn price; always use the figure shown on your bet slip.
• Dead heats (win): if T runners tie for a winning place, return = (stake ÷ T) × decimal odds. The non‑winning portion of the stake is lost.
• Dead heats (place): if T tie for R remaining places, the fraction R/T of the place stake is settled at the place odds; the remainder loses.

Scenario	Inputs	Calculation	Net return
Exchange commission	£10 at 3.00, 5% commission	Profit = £20; commission = £1; net profit = £19	£29.00 (net decimal 2.90)
Rule 4 deduction	£10 at 4/1 (5.00), 20p/£	Win profit = £40; deduction = £8; net profit = £32	£42.00 (net decimal 4.20)
Dead heat (win), two‑way tie	£10 at 4/1 (5.00), T = 2	Return = (10 ÷ 2) × 5.00 = £25.00	£25.00
Dead heat (place), tie for final place	Place stake £10 at 4/1, place terms 1/5, T = 4 tie for R = 3 places	Winning stake = £10 × (3 ÷ 4) = £7.50; place decimal = 1 + (5.00 − 1) × 0.20 = 1.80; return = £7.50 × 1.80	£13.50

Notes: rounding is to the nearest penny. Some exchanges apply additional fees beyond base commission; those are not included. Always verify Rule 4 and settlement notes on your bet receipt for the specific event.

Is there a free app and betting tracker for mobile?

Yes. You can use the calculator free in your mobile browser, or install the Progressive Web App (PWA) to get offline access and a built‑in betting tracker. The tracker records each bet (market, odds, stake, commission, Rule 4, dead‑heat factors), computes P&L, ROI, hit rate, CLV (closing line value) and optional Kelly guidance, and exports to CSV for spreadsheets.

• Installable PWA: Add to Home Screen on iOS and Android for app‑like performance, offline caching and background updates.
• Tracker metrics: net profit after commission/R4, ROI, EV, CLV, average odds, average stake, longest win/loss streaks.
• Data control: local storage by default; optional encrypted cloud sync if you enable it.
• Exports and audit: one‑tap CSV export with timestamps for reconciliation to bookmaker or exchange statements.

Feature	Mobile web	PWA (installed)	Notes
Offline use	Limited	Yes	PWA caches calculator and recent logs for no‑signal use.
Add to Home Screen	No	Yes	App‑icon launcher with full‑screen UX.
Push notifications	No	Yes (Android), Limited (iOS)	Subject to user permission and OS capabilities.
CSV export	Yes	Yes	Includes stake, odds, commission, Rule 4 and dead‑heat fields.
Tracker analytics	Yes	Yes	ROI, CLV, EV and Kelly (optional) across custom date ranges.
GBP default	Yes	Yes	Set currency to £ by default for UK users; multi‑currency available.

The app and tracker are free to use. No account is required for local tracking; create an account only if you want multi‑device sync.

Multiples made easy: doubles, trebles, accumulators

Use the multiples engine to build and price combinations from your shortlists. Enter your selections and choose “All doubles”, “All trebles” or a custom accumulator; the calculator explodes them into the correct number of bets, applies your stake model (level stake per bet or split a total budget evenly), and returns per‑bet and total returns, profit and effective odds. Voids are correctly treated as pushes (odds 1.00) within a multiple, and rounding is to the nearest penny for UK users.

Doubles and trebles calculator (free) overview

This tool prices two‑leg and three‑leg combinations across any sport or market that settles win/push/loss. It supports both win‑only and each‑way (where applicable), and handles pushes (void legs), partial pushes on Asian lines, and non‑runner consolidation. Use it to compare the risk/reward of doubles versus trebles from the same shortlist.

• Select bet type: Double (2‑leg) or Treble (3‑leg), or choose “All doubles/All trebles” to perm across N selections.
• Enter odds in fractional, decimal or American formats; the calculator auto‑converts and multiplies decimals for combined pricing.

Choose stake mode:

• Level stake per bet (e.g., £1 on each double/treble), or
• Total budget (e.g., £60 split across all trebles).

• Review outputs: per‑bet return and profit, total return and profit across the perm, and effective combined decimal and fractional odds.

Settlement rules:

• Win‑only double return = stake × d1 × d2; treble return = stake × d1 × d2 × d3 (where d = decimal odds).
• Void leg inside a multiple is settled at 1.00; a double with one void becomes a single, a treble with one void becomes a double.
• Pushes on two‑way markets (e.g., DNB, O/U 2.0, AH 0) act as voids.

Worked examples:

• Double: £10 at 2.50 and 1.80 → return £10 × 2.50 × 1.80 = £45.00; profit £35.00.
• Treble: £5 at 2.00, 2.20, 3.00 → return £5 × 2.00 × 2.20 × 3.00 = £66.00; profit £61.00.

How many trebles in 10 or 12 selections today?

The count of distinct trebles from N selections is the combination C(N, 3) = N × (N − 1) × (N − 2) ÷ 6. This is the exact number of three‑leg bets created by “All trebles”.

Selections (N)	All doubles C(N,2)	All trebles C(N,3)	All 4‑folds C(N,4)
6	15	20	15
10	45	120	210
12	66	220	495

Quick answers for today’s perms: 10 selections produce 120 trebles; 12 selections produce 220 trebles. If you set a total budget (e.g., £60) for “All trebles”, the per‑bet stake is the budget divided by the number of bets (e.g., £60 ÷ 120 = £0.50 per treble for N = 10).

How many 4 timers in 6 selections?

“4 timers” are 4‑fold accumulators. From 6 selections, the number of distinct 4‑folds is C(6,4) = 15. With level stake per bet, placing £2 on each 4‑fold would require £30 in total (15 × £2). If you prefer a single budget (e.g., £15 total on “All 4‑folds”), the calculator splits it evenly to £1 per bet and aggregates returns across all 15 combinations.

• Sanity check: from 6 selections, the high‑order counts are C(6,5) = 6 five‑folds and C(6,6) = 1 six‑fold, consistent with standard combination maths.
• Voids inside a 4‑fold reduce it to a 3‑fold at odds ×1.00; multiple voids reduce further accordingly.
• Effective odds for a perm are computed from total return ÷ total stake, letting you compare different staking plans fairly.

What is a no-vig calculator and how do you size sharp stakes?

A no-vig (zero-margin) calculator removes the bookmaker’s overround from market odds to reveal fair probabilities and fair odds. By normalising the inverse odds across all outcomes so they sum to 100%, you get a “vig-free” baseline for value assessment. The Sharp Stakes Calculator also translates your edge into stake sizing via Kelly (full or fractional) or flat staking, so you can balance growth and volatility based on confidence and bankroll.

No-vig (zero margin) odds: remove the overround

Overround is the sum of implied probabilities from the quoted odds; it usually exceeds 100% because it includes the bookmaker margin. To de-vig a market with outcomes i = 1..k:

• Implied probability per outcome: pi,imp = 1 / di (where d is decimal odds).
• Overround: R = Σ pi,imp. If R > 1, margin is (R − 1) × 100%.
• No‑vig probability: pi,nv = pi,imp / R. These now sum to 1.00.
• No‑vig odds: di,nv = 1 / pi,nv.

Market	Quoted odds	Implied probs	Sum implied (overround)	No‑vig probs	No‑vig odds
Two‑way (symmetrical)	1.91 / 1.91	52.356% / 52.356%	104.712%	50.000% / 50.000%	2.000 / 2.000
Two‑way (asymmetrical)	1.83 / 2.00	54.645% / 50.000%	104.645%	52.240% / 47.760%	1.915 / 2.094
Three‑way (1X2)	2.50 / 3.40 / 3.10	40.000% / 29.412% / 32.258%	101.670%	39.343% / 28.934% / 31.723%	2.541 / 3.456 / 3.153

• Interpretation: prices shorter than no‑vig odds imply negative value; prices longer than no‑vig odds imply potential value (given your own probability estimates).
• No‑vig is descriptive, not predictive. Compare your model probability to pnv to determine edge before you size a stake.

Kelly vs flat staking: when to use each?

Kelly maximises long‑run logarithmic growth when your edge and probabilities are correctly estimated; flat staking keeps volatility predictable and is robust when estimates are noisy. The calculator supports full Kelly and fractional Kelly (e.g., 1/2, 1/4) alongside flat “unit” staking.

• Kelly fraction (decimal odds): let b = d − 1, p = your win probability, q = 1 − p. Then f* = (b·p − q) / b. If f* ≤ 0, do not bet.

Use Kelly when:

• You have a tested, calibrated edge model (e.g., back‑tested forecasts, out‑of‑sample validation).
• You can tolerate drawdowns; consider fractional Kelly (1/2 or 1/4) to reduce variance.

Use flat staking when:

• Edge confidence is low or unproven, or markets are highly correlated.
• You need simple bankroll control (e.g., fixed £10 per bet) or are pursuing promos with caps.

Case	Decimal odds (d)	Win prob (p)	EV% on stake	Kelly f*	Full‑Kelly stake (£1,000 roll)	Quarter‑Kelly stake (£1,000 roll)
A (value even)	2.00	0.55	+10.00%	0.10	£100	£25
B (big price)	3.00	0.40	+20.00%	0.10	£100	£25
C (negative edge)	1.90	0.50	−5.00%	−0.0556 (bet 0)	£0	£0

• Risk control: cap maximum stake per selection/event and aggregate exposure across correlated bets to avoid over‑staking.
• Reality check: fractional Kelly (e.g., 25%–50% of f*) materially reduces drawdowns while preserving most growth in practice.

What edge, EV, and stake units does the tool show?

The calculator displays market‑derived and user‑derived metrics side by side so you can verify price quality, expected return, and position size. You can choose outputs in currency (£), bankroll percentage, or “units” (a user‑defined flat amount).

• Implied probability from price: pimp = 1 / d.
• No‑vig (fair) probability/odds: pnv, dnv as defined above.
• Price edge (probability points): Δp = pest − pnv (percentage points).
• Price edge (% vs fair odds): (d − dnv) ÷ dnv × 100%.
• Expected value (EV% on stake): 100 × (pest · d − 1).
• Kelly stake suggestions: full, 1/2, 1/4 Kelly as bankroll %, optionally rendered as £ or units.

Metric	Definition	Units	Example
Implied probability	1 / d	%	d = 2.05 → 48.78%
No‑vig fair odds	1 / (pimp ÷ Σ pimp)	Decimal	Two‑way 1.95/1.95 (104.10%) → 2.03/2.03
Edge (probability points)	pest − pnv	pp (percentage points)	pest = 54%, pnv = 50% → +4.00 pp
Edge (% vs fair odds)	(d − dnv) ÷ dnv × 100%	%	d = 2.05, dnv = 2.00 → +2.50%
EV% on stake	100 × (pest · d − 1)	%	p = 0.54, d = 2.05 → 10.70%
Kelly fraction	f* = ( (d − 1)·p − (1 − p) ) ÷ (d − 1)	% of bankroll	p = 0.54, d = 2.05 → f* ≈ 10.19%
Stake units	User‑defined fixed unit or % of bankroll	£ / % / units	1 unit = £10; 1/4‑Kelly on £1,000 at f* = 10% → £25 (2.5 units)

• Configuration: set your “1 unit” size and bankroll once; outputs update live as odds and pest change.
• Good practice: sanity‑check EV% and Kelly stake against no‑vig odds to ensure the edge is not solely due to an outlier price or stale line.

Historical context: from paper perms to smart calculators

Before digital tools, UK punters relied on ready reckoners, newspaper coupon tables and hand-written slips to build perms and settle bets. That workflow was slow and fragile: multiplying prices across dozens of combinations, adjusting for non‑runners, Rule 4 deductions and dead heats, then reconciling to a bookmaker or exchange statement often led to compounding errors. Modern calculators replaced those manual steps with exact combinatorics, deterministic settlement rules and auditable logs, making multiples faster to construct and far easier to verify.

Why were manual perms and tables error-prone?

Paper tables and pocket calculators were fine for a single double, but they broke down at scale. As soon as you perm across 6–12 selections, the number of bets explodes and small arithmetic slips cascade into material settlement errors.

• Combinatorics at speed: choosing the correct count of combinations is non‑trivial under time pressure. For example, all doubles from N selections is C(N,2) and all trebles is C(N,3). Miscounting causes under‑ or over‑staking.
• Rounding drift: repeatedly multiplying decimals and rounding “on the fly” creates penny drift across hundreds of lines; without fixed‑point settlement, the total can be off by pounds.
• Voids and non‑runners: a void leg turns a treble into a double at odds ×1.00. Missing a single void adjustment misstates both the number of live bets and total return.
• Each‑way place terms: mixing 1/5 and 1/4 place fractions or the wrong number of places (e.g., enhanced vs standard) is a common manual error.
• Rule 4 and dead heats: Tattersalls deductions apply to win profits only; dead heats split stake or settlement fractionally. Both are easy to misapply by hand.
• Budget splits: allocating a total pot evenly across 120 trebles or 210 four‑folds often leaves rounding remainders; deciding where extra pennies go needs deterministic rules.
• Audit gap: without time‑stamped logs, it’s hard to replicate how totals were derived when disputing a settlement or tracking P&L over time.

Which dead ends failed: naive martingale, all-in accas, overbetting?

Several staking “hacks” became popular precisely because manual workflows were slow and opaque. They look attractive on paper but fail under realistic bankrolls, line movement and limits.

Naive martingale (double after loss):

• At even money (d = 2.00), required stakes grow as powers of two; a modest losing streak forces huge exposure. With finite bankroll or stake limits, the strategy collapses at the first long run of losses.
• Even with true 50/50 outcomes, the probability of 10 straight losses is 1/1024 ≈ 0.098%; rare but inevitable over time—and catastrophic when it occurs.

All‑in accumulators:

• Compounds bookmaker margin and correlation risk; one losing leg zeroes the bankroll. Even with positive EV singles, concentration pushes variance beyond most risk tolerances.
• Kelly theory recommends smaller fractions as odds rise and legs correlate; “all‑in” violates that principle.

Overbetting a real edge:

• Betting above Kelly (especially >2×) reduces long‑run growth and increases risk of large drawdowns.
• Ignoring correlation (e.g., multiple markets on the same match) inflates effective stake on a single outcome path.

Loss streak (k)	Next stake at d = 2.00 (£1 base)	Cumulative outlay incl next (£1 base)	Next stake (£10 base)	Cumulative outlay incl next (£10 base)
0	£1	£1	£10	£10
1	£2	£3	£20	£30
2	£4	£7	£40	£70
3	£8	£15	£80	£150
4	£16	£31	£160	£310
5	£32	£63	£320	£630
6	£64	£127	£640	£1,270
7	£128	£255	£1,280	£2,550
8	£256	£511	£2,560	£5,110
9	£512	£1,023	£5,120	£10,230
10	£1,024	£2,047	£10,240	£20,470

Interpretation: to guarantee a £1 net profit at even money after 10 losses, you must risk £2,047 in total (or £20,470 on a £10 base). In practice, bankroll limits, maximum stakes and price changes make this path infeasible long before such streaks occur.

How did modern calculators fix speed, accuracy, and audit?

Smart calculators replaced manual friction with deterministic engines and reproducible outputs, improving decision speed and record‑keeping for both recreational and sharp users.

Speed:

• Instant perm expansion using exact combinations C(N, r) and efficient iterators for thousands of lines.
• Real‑time recalculation on price updates, voids and place‑term changes.

Accuracy:

• Fixed‑point currency math (penny‑accurate) to prevent rounding drift across large perms.
• Codified settlement: pushes → odds 1.00, dead‑heat stake fractions, Tattersalls Rule 4 on win profits only, exchange commission on profit only.
• Deterministic stake‑split rules for total‑budget perms so every penny is allocated once.

Audit:

• Time‑stamped logs of inputs (odds, stakes, place terms, deductions) and outputs (per‑bet and aggregate returns).
• CSV export for reconciliation to bookmaker or exchange statements, plus filters by event, market and date range.
• Versioned calculator logic so historical results can be reproduced exactly for disputes or analysis.

The other side: why not trust a stakes calculator?

A stakes calculator is arithmetic, not an edge. It can multiply odds, remove overround, and suggest stake sizes—but it cannot tell you the true probability of an outcome, nor can it manage bookmaker rules, limits, or market dynamics for you. The strongest risk is misplaced confidence: if your inputs (odds, probabilities, place terms, commission, deductions) are wrong or incomplete, the outputs will look precise yet be decisively wrong. Use the tool as a settlement and planning aid, not as a substitute for pricing models, market knowledge, or responsible bankroll control. For responsible gambling guidance in Great Britain, see the UK Gambling Commission at [gamblingcommission.gov.uk](https://www.gamblingcommission.gov.uk) and advice from [begambleaware.org](https://www.begambleaware.org).

What’s the strongest argument against using this tool?

Calculators turn inputs into tidy numbers, but betting outcomes depend on true probabilities you can’t observe directly. If your estimated edge is off by just a few percentage points, Kelly sizing can over‑ or under‑stake dramatically, and no‑vig comparisons can flag “value” that isn’t there. Common pitfalls include correlated bets that inflate risk, stale or boosted prices that vanish before placement, settlement nuances (Rule 4 bands, dead heats, push handling) differing by bookmaker, and human data‑entry errors. The core argument against blind trust is this: precision without accuracy is dangerous—mathematically correct transformations of incorrect inputs still produce poor bets.

• Model risk: small probability errors lead to large stake errors under Kelly.
• Execution risk: prices move; limits and max payout caps truncate theoretical returns.
• Settlement variance: bookmakers can differ on deductions, place terms, and rounding.
• Correlation: multiple markets on the same fixture amplify variance beyond plan.
• Cognitive bias: tidy outputs may encourage overconfidence and overbetting.

Sharp Stakes vs Wager Sharp and SharpBetting: what’s different?

These brands all address “calculate my bet” needs but emphasise different workflows. Sharp Stakes (this tool) focuses on no‑vig normalisation, EV/Kelly sizing, and perm expansion for doubles/trebles/accas with audit‑ready outputs for UK settlement conventions. Third‑party sites provide their own calculators and content; features, scope and pricing are determined by their operators and can change. Always review the current feature lists on each site before choosing a workflow.

Aspect	Sharp Stakes (this tool)	Wager Sharp	SharpBetting
Primary focus	No‑vig odds, EV/Kelly sizing, UK multiples (doubles/trebles/accas), Rule 4/dead‑heat handling	Provides betting calculators and resources; verify scope on site	Provides betting tools/content; verify scope on site
Multiples (all doubles/trebles)	Yes, with exact C(N, r) counts and budget split options	See calculators page: wagersharp.com	See site: sharpbetting.co.uk
No‑vig (overround removal)	Yes; normalises implied probabilities to 100%	Check feature availability on site	Check feature availability on site
Stake sizing	Flat, full Kelly, fractional Kelly	Check feature availability on site	Check feature availability on site
Tracker and export	Built‑in log, CSV export for audit/reconciliation	Check site for tracking/export features	Check site for tracking/export features
Settlement conventions	UK‑centric: Rule 4 on win profit, voids as 1.00, dead‑heat fractions	Implementation varies—see site	Implementation varies—see site

Tip: before committing to any tool, run the same small test perm (e.g., three selections at known prices with a known void) across platforms and compare per‑bet and total returns. Consistency and transparency matter more than feature lists.

When is a simple on-site bet calculator enough?

A bookmaker’s basic calculator is often sufficient when you only need quick arithmetic for straightforward bets and no advanced adjustments. If you do not require no‑vig analysis, EV/Kelly sizing, permutation expansion, or audit logs, a simple on‑site tool saves time.

• Singles or a single double/treble at fixed odds, no commission, no Rule 4, no dead‑heat concerns.
• Pre‑bet sanity checks: “What’s my potential return if this wins?” without stake optimisation.
• Low‑correlation, recreational staking with fixed £ stakes and minimal record‑keeping needs.
• Fast confirmation of returns that already appear on the bet slip, using the same bookmaker’s settlement rules.

• Use a simple calculator if you care only about gross return and basic profit.
• Use an advanced tool when you need fair odds (no‑vig), EV, Kelly sizing, UK settlement nuances, or to perm across many selections with a fixed budget.

Frequently Asked Questions

Is this the official Sharp Stakes Calculator for 2026 and is it free?

Yes. The 2026 edition is the official Sharp Stakes Calculator and it is free to use on web and as an installable PWA, with no account required unless you enable sync. It supports UK‑standard settlement (fractional odds by default, Rule 4 on win profit, dead‑heat handling), football markets including Asian handicap, and analytic outputs such as no‑vig fair odds, EV and Kelly.

How do I build a Yankee, Lucky 15, Heinz or Goliath with this tool?

Use the perm options to replicate named bets by combining singles and All-folds exactly matching the bet’s composition, then split a total budget or apply level stakes. Counts are fixed: Patent = 7 bets (3 singles, 3 doubles, 1 treble), Trixie = 4 bets (3 doubles, 1 treble), Yankee = 11 bets (6 doubles, 4 trebles, 1 fourfold), Lucky 15 = 15 bets (adds 4 singles to a Yankee), Canadian/Super Yankee = 26 bets (10 doubles, 10 trebles, 5 fourfolds, 1 fivefold), Heinz = 57 bets (15 doubles, 20 trebles, 15 fourfolds, 6 fivefolds, 1 sixfold), Super Heinz = 120 bets (for 7 selections), and Goliath = 247 bets (for 8 selections).

How do I calculate EV and Kelly after both commission and a Rule 4 deduction?

Convert the price to a net decimal first, then compute EV and Kelly on that net price. If d is decimal odds, commission c is a fraction on profit and Rule 4 r is a fraction on win profit, the net decimal is d_net = 1 + (d − 1) × (1 − c) × (1 − r); the break‑even win probability is 1 ÷ d_net; EV% = 100 × (p × d_net − 1) and Kelly fraction f* = ((d_net − 1) × p − (1 − p)) ÷ (d_net − 1). Example: at d = 5.00 with c = 5% and r = 20p/£ (r = 0.20), d_net = 1 + 4 × 0.95 × 0.80 = 4.04, break‑even p = 24.75%; if your p = 28%, EV% = 13.12% and f* ≈ 4.31% of bankroll.

Can I mix fractional, decimal and American odds in one multiple?

Yes. The calculator normalises all legs to decimal internally and multiplies them, so you can mix formats safely. For example, a treble at 3/2, 1.80 and −110 becomes 2.50 × 1.80 × 1.909 = 8.591; a £5 stake would return £42.96 after penny rounding.

How do pushes and voids change returns inside doubles and trebles, including Asian quarter lines?

Inside a multiple, any push settles at 1.00 for that leg so a double with one push becomes a single and a treble with one push becomes a double. For Asian −0.25 or +0.25, half the stake is on the 0 line and half on the ±0.5 line, so a draw on −0.25 yields half‑push and half‑loss, which is an effective leg factor of 0.50; for example a double at 2.00 and AH −0.25 at 2.00 that draws on the handicap returns stake × 2.00 × 0.50 = stake.

How are dead heats settled in each‑way and how does that flow through a multiple?

For a win dead heat with T tied runners, the winning stake share is stake ÷ T at the win odds, and only that return rolls to the next leg; the non‑winning share is lost. Example: a £5 win part at 4/1 (5.00) dead‑heats two‑way returns £12.50, which becomes the stake for the next leg; if the second leg wins at 3/1 (4.00), the win‑win path returns £12.50 × 4.00 = £50.00 on the win part, while the place part is settled independently using the place fraction and any place dead‑heat ratio.

How should I use no‑vig fair odds to decide if a price is value?

Compare your estimated win probability to the no‑vig probability, or compare the market price to the no‑vig fair odds and look for the price to be longer than fair. Example: if a two‑way market 1.91/1.91 implies 104.71% overround, the no‑vig fair is 2.00 each; backing 2.05 requires only 48.78% to break even while fair is 50.00%, so an estimate p = 52% yields EV% = 52% × 2.05 − 100% = +6.6% and a positive Kelly fraction.

Why do my results differ by 1p from a bookmaker’s calculator and how is rounding applied?

Differences usually come from when rounding is applied (per‑bet vs aggregate), how voids and dead‑heat fractions are sequenced, or which Rule 4 band the bookmaker used. The calculator rounds each bet to the nearest penny and treats pushes at 1.00 per leg before aggregation; for instance two doubles each returning £12.495 will round to £12.50 per bet and sum to £25.00, while a tool that rounds only at the aggregate might show £24.99.

How big a perm can I compute on mobile without it timing out?

The practical limit is driven by the combinatorics, not just the device, so estimate counts before expanding. As reference points, All doubles count is C(N,2) so 30 selections produce 435 doubles, All trebles count is C(N,3) so 20 selections produce 1,140 trebles, and All 4‑folds count is C(N,4) so 12 selections produce 495 fourfolds; checking counts first prevents accidental multi‑thousand‑line expansions on a small device.

Can I import odds from a bookmaker automatically or model cash‑out and bonuses?

Automatic slip import and cash‑out ladder modelling are not supported; inputs are manual and calculations are for settled results. You can export full logs to CSV, and you can approximate free bets by valuing them as stake‑not‑returned, i.e., treat the effective decimal as (d − 1) so a £10 free bet at 5.00 is worth £40 gross rather than £50.

How does the tracker handle my data and GDPR in the UK?

By default your data is stored locally in your browser or PWA and no account is needed; optional multi‑device sync is encrypted and opt‑in. You can export or delete records at any time, and because no personal account is required for local mode, data remains on your device unless you enable sync, which aligns with GDPR principles of data minimisation and user control.

Can I model taxes or non‑UK deductions in the results?

UK punters have no tax on winnings, but you can mimic foreign taxes or fees by using the commission input as an effective rate on profit. For example, at decimal 3.50 with a 15% tax modelled as commission, the net decimal becomes 1 + (3.50 − 1) × (1 − 0.15) = 3.125 and the break‑even probability rises from 28.57% to 32.00%.

How should I cap Kelly stakes when my selections are correlated?

Treat correlated outcomes as a single exposure and cap the combined stake at a chosen bankroll percentage or fractional Kelly. If full‑Kelly suggests 10% on each of two markets that both mainly win when the same team wins, a conservative cap is to limit combined exposure to 5% of bankroll (half‑Kelly total) or less, so a £1,000 roll would risk at most £50 across both rather than £200.

What input mistakes most often produce wrong outputs and how do I sanity‑check them?

The most common errors are entering fractional odds inverted, forgetting that Rule 4 applies only to win profit, leaving commission on when pricing fixed‑odds, and mixing place terms across legs. Quick checks are to confirm that even money 1/1 equals 2.00, that a 20p/£ Rule 4 on 4/1 reduces net decimal from 5.00 to 4.20, that a push leg becomes 1.00 in a multiple, and that EV% at p = 1 ÷ d is exactly 0.00%.