🎯 Betting Calculator

How do I calculate my bet returns online?

Use the odds calculator to model your payout before you place a bet. Enter your stake, select the odds format used by your bookmaker (fractional, decimal, or American), and add any settlement modifiers such as each-way terms, Rule 4 deductions, or dead-heats when relevant. The tool applies UK settlement logic, so it’s ideal for racing, football, and general sports markets.

Odds calculator single: how do I enter stake, odds and each-way?

A single is one selection with one outcome. If you add each-way (EW), it becomes two equal stakes: one on the win and one on the place part at the stated place terms.

• Stake: Enter your total unit stake for the bet. For each-way, remember the total outlay doubles (stake on win + stake on place).

• Odds format: Choose fractional (e.g., 5/2), decimal (e.g., 3.50), or American (e.g., +250). The calculator will convert internally. Each-way toggle: If applicable, switch on each-way and set the place terms exactly as offered (e.g., 1/5 odds, places 1–3). The calculator will:

• Split the stake equally between win and place parts.

• Reduce the odds on the place part by the stated fraction (e.g., 1/5 of 10/1 becomes 2/1).

• Result: Select whether the selection won, placed, or lost (and apply any Rule 4 or dead-heat only if they occurred).

Formulas for a single (fractional odds a/b, stake S):

• Win-only return (no R4, no dead-heat): Return = S × (a/b) + S; Profit = S × (a/b). Each-way return if the selection wins:

• Win part return = (S × (a/b)) + S

• Place part return = (S × (a/b × place_fraction)) + S

• Total return = sum of the two; total outlay = 2S

Each-way return if the selection only places:

• Win part loses
• Place part return = (S × (a/b × place_fraction)) + S
• Total return = place part only; total outlay = 2S

Worked examples (UK settlement):

• Win single: £10 at 5/2 (2.5/1) returns £10 × 2.5 + £10 = £35 (profit £25). Each-way single: £10 EW at 10/1, 1/5 odds, places 1–3 (total outlay £20)

• If it wins: Win return £10 × 10 + £10 = £110; Place odds 10/1 × 1/5 = 2/1 ⇒ Place return £10 × 2 + £10 = £30; Total return £140; Profit £120.

• If it places only: Win part loses; Place return £30; Loss £20 – £30 = -£-? Wait: Profit = £30 - £20 = £10.

Should I choose fractional, decimal or American odds?

Choose the format you’re most comfortable with or that matches your bookmaker. Fractional is traditional in the UK and shows profit relative to a £1 stake. Decimal is popular for clarity in multiples (the number is the total return per £1, including stake). American (moneyline) shows plus for underdogs and minus for favourites.

• Fractional (a/b): Natural for UK racing and each-way terms; quick to see profit per unit.
• Decimal (d): Easiest for accumulators; total return per £1 is d; implied probability = 1/d.
• American (+x or -y): Common on US books; converts cleanly once you know the rules.

Conversion formulas (exact): Fractional a/b → Decimal = a/b + 1; Implied probability = b / (a + b). Decimal d → Fractional = d − 1 (expressed as a rational fraction); Implied probability = 1 / d. American +x → Decimal = 1 + x/100; Implied probability = 100 / (x + 100). American −y → Decimal = 1 + 100/y; Implied probability = y / (y + 100).

Rule 4, dead-heat and voids: when should you apply them?

Apply these modifiers only when they actually occur and exactly as stated by the bookmaker at settlement time.

Rule 4 (R4) deductions — horse racing non-runners after the final declarations: A fixed deduction (e.g., 20p in the £) is applied to winnings only, not the stake. The rate depends on the withdrawn horse’s price at the time of withdrawal and may vary by firm; always use the announced rate on your bet.

• Example: £20 win single at 4/1 with a 20p R4. Winnings before R4 = £20 × 4 = £80. Deduction = 20% of winnings = £16. Adjusted winnings = £64. Total return = £64 + £20 stake = £84.

Dead-heat — two or more selections tie for a finishing position:

Win market: Divide the stake by the number of tied runners, then settle that portion at full odds; the remainder is treated as lost.

• Example: £10 at 6/1 in a two-way dead-heat for first. Effective stake = £10 ÷ 2 = £5. Return = £5 × 6 + £5 = £35.

Each-way place part: If your selection dead-heats for the last paid place, divide the place stake by the number tied, then settle at the place odds.

• Example: £10 EW at 10/1, 1/5 odds, places 1–3; your runner dead-heats for 3rd with one other and does not win. Place stake halves to £5; place odds = 10/1 × 1/5 = 2/1. Place return = £5 × 2 + £5 = £15 (win part loses).

Voids/pushes — selection does not run or market rules refund:

• Singles: Stake is returned (no win, no loss) when the selection is void.
• Accumulators: A void leg is treated as odds 1.00 (decimal), leaving the rest of the acca unchanged.
• Example acca: £10 on three legs at 2.00, 1.80, 1.50 with one additional void leg. Effective multiplier = 2.00 × 1.80 × 1.50 × 1.00 = 5.40. Return = £10 × 5.40 = £54.00.
• Markets with push outcomes (e.g., Draw No Bet, Asian Handicap 0): A push refunds that leg as void per market rules.

Notes: Always match each-way terms, Rule 4 rates, dead-heat counts, and market rules to your bookmaker’s settlement. The calculator mirrors these inputs precisely; small rounding differences may occur between firms.

How do I work out acca, doubles, trebles and system bets?

An accumulator (acca) multiplies the decimal price of each winning leg; doubles and trebles are simply 2- and 3-leg accumulators. System bets (e.g., Yankee, Lucky 15, Heinz) place multiple combinations at once, so you can still get a return even if not all selections win. The calculator handles all of these: you enter stake, choose odds format, add legs, and select the bet type. Voids are treated as decimal 1.00, dead-heats and Rule 4 apply to affected legs only, and each-way is available where relevant (mainly racing).

Odds calculator acca: 4-fold to 20-fold made simple

Accas require all included legs to win (unless a leg is void, which counts as odds 1.00). For decimal odds, the total return equals stake multiplied by every leg’s decimal price. For fractional or American, the calculator converts to decimal behind the scenes, applies any leg-specific adjustments (e.g., R4, dead-heat), and multiplies. You can add anywhere from a 4-fold to a 20-fold; the logic is identical regardless of length.

• Select acca and set your total stake (the acca is a single bet).

• Add each leg with its market odds. If a leg is void, set its settlement to “void” (treated as 1.00).

• Optional: apply per-leg adjustments only if they actually occurred (e.g., Rule 4 in racing).

• Calculate: Return = Stake × Π(decimal odds of all settled legs).

• Example 4-fold (decimal): Stake £10 on 1.80, 2.10, 1.95, 2.50 ⇒ Product = 1.80 × 2.10 × 1.95 × 2.50 = 18.4275 ⇒ Return ≈ £184.28.

• Example 6-fold with a void: Stake £5 on 1.70, 1.90, 2.40, 1.50, 1.80, void ⇒ Product = 1.70 × 1.90 × 2.40 × 1.50 × 1.80 × 1.00 = 20.9304 ⇒ Return ≈ £104.65.

Notes: Most UK books round to the nearest penny on settlement. Early cash-out, bonuses/insurance, or rule-specific pushes (e.g., some handicaps) alter returns and should be modelled via the calculator’s bonus/void fields rather than changing the odds themselves.

What’s the difference between acca, Yankee, Lucky 15 and Heinz?

An acca is one bet that needs every leg to win. System bets spread your risk across combinations of doubles/trebles/folds, so you can still get paid if only some selections win. Lucky bets add singles; Yankees and Heinz do not. The table below compares the popular UK types.

Key takeaways: Choose an acca for maximum payout when confident all legs will win; choose Yankee/Heinz to keep some return alive with partial success. Lucky versions include singles, improving the chance of a small return but increasing total stake (since each component is a separate bet).

Odds calculator football: add legs and apply bonus or insurance

For football accas (1X2, BTTS, Over/Under, handicaps), add each leg with its market odds and ensure settlement rules match 90-minute markets unless noted (extra time and pens do not count for standard 1X2). If a leg is a push (e.g., Asian Handicap 0) it settles void (decimal 1.00). Many UK bookmakers offer acca bonuses (extra % on winnings) or insurance (refund if exactly one leg loses). The calculator models these by applying a bonus to the winnings portion or by flagging an insurance outcome.

• Bonus application: Bonus% applies to winnings only (base return − stake). New return = base return + (base return − stake) × Bonus%.

• Insurance: If exactly one leg loses, cash return is usually £0 and the stake is refunded as a free bet; model this as “insurance refund” rather than a cash return.

• Void legs: Treat as 1.00; the rest of the acca stands.

• Bonus example (5-fold): Stake £10 at 1.60, 2.00, 1.83, 2.20, 1.50 ⇒ Product = 19.3248 ⇒ Base return ≈ £193.25; Winnings ≈ £183.25. With a 10% bonus ⇒ Bonus ≈ £18.33 ⇒ Total return ≈ £211.58.

• Insurance example (5-fold): If one leg loses under an insurance offer, the calculator shows £0 cash return and a £10 free-bet refund (exact value depends on the offer’s terms).

Tip: For mixed-football markets (e.g., BTTS + Over 2.5) ensure each leg’s settlement window matches the market rules. Always enter official prices and any boosts as odds (not as a bonus) unless your bookmaker explicitly labels it a separate bonus.

Free bet calculator: do returns exclude the stake?

Most UK “free bets” are stake not returned (SNR): if your pick wins, you receive only the profit portion, not the value of the free stake itself. Some offers (rare) are stake returned (SR), paying as if it were cash. The calculator lets you toggle between SNR and SR so returns reflect the actual promo terms. Enter your odds, choose SNR or SR, and the tool applies the correct formula automatically; voids typically return the free bet as a token (not cash), which you should record separately.

How do I toggle free bet stake not returned (SR/SNR)?

Set the free bet mode before calculating. SNR (stake not returned) outputs only winnings; SR (stake returned) includes the free bet value in the payout. For decimal odds d and free bet value F:

• SNR return = F × (d − 1). Stake is excluded from the return.

• SR return = F × d. Stake is included in the return.

• Cash stake return (for comparison) = S × d, where you pay S in cash.

• Select “Free bet” and set value (e.g., £10).

• Choose SNR (typical UK free bet/bonus bet) or SR (rare promo that returns the stake).

• Enter the odds in your preferred format (fractional/decimal/American).

• Calculate. If the selection loses, return is £0 for SNR/SR; if void, most firms reissue the free bet (not cash).

Tip: SNR value scales with (decimal odds − 1). For the same free bet, higher odds increase expected cash return if the selection wins. Always match the calculator mode to the exact promo wording.

Each-way with a free bet: is it ever worth it?

Using a free bet each-way (EW) splits the free stake equally between the win and place parts, and both parts follow the free-bet rule (usually SNR). Because the place part uses reduced place odds (e.g., 1/5, 1/4), win potential drops sharply versus a straight win. This makes EW with SNR generally less efficient than win-only—unless your strategy values hedging or the race has unusually generous place terms.

• Structure: A £10 free bet EW becomes £5 SNR win + £5 SNR place at the stated place fraction.
• If your selection wins: You get SNR winnings on both parts.
• If it places (does not win): Win part returns £0; place part returns SNR winnings at reduced place odds.

Example (SNR): £10 free bet EW at 10/1 (dec 11.00), 1/5 odds, places 1–3.

• Win-only (for comparison): £10 SNR at 10/1 ⇒ Return = 10 × (11.00 − 1) = £100. EW, selection wins:

• Win part: £5 × (11.00 − 1) = £50

• Place part: Place odds = 10/1 × 1/5 = 2/1 (dec 3.00) ⇒ £5 × (3.00 − 1) = £10

• Total SNR return = £60 (lower than £100 win-only)

EW, selection places (no win):

• Win part: £0
• Place part: £10
• Total SNR return = £10

When might EW be considered with SNR?

• Enhanced place terms (e.g., extra places) where place odds/frequency meaningfully improve.

• If you prioritise variance reduction over maximum upside.

• Guideline: For pure value from an SNR token, win-only on bigger prices typically yields higher potential return than EW. For SR tokens (rare), the trade-off is less severe but the same logic applies.

Can the calculator model boosts, moneyback or cash-out?

Yes—treat each mechanic according to how it pays out. Price boosts change the odds themselves; winnings boosts add a percentage to the profit; insurance and moneyback offers usually refund your stake as a free bet if a condition triggers; cash-out replaces settlement with a fixed cash figure offered pre‑result.

Price boost (new odds): Replace the original odds with the boosted odds and calculate normally.

• Example: Boost from 2.80 to 3.10, £20 cash stake ⇒ Return = £62.00 (vs £56.00 pre-boost).

Winnings boost (% on profit): Apply to the winnings portion only.

• Formula (cash stake S, decimal d, boost B%): Base return = S × d; Winnings = Base − S; Bonus = Winnings × B%; Total return = Base + Bonus.
• Example: £10 at 5.00 with +20% boost ⇒ Base = £50; Winnings = £40; Bonus = £8; Total return = £58.

Acca bonus/insurance:

• Bonus: Apply B% to winnings portion of the successful acca (same formula as above).
• Insurance (e.g., “one leg fails”): If exactly one leg loses, cash return is £0 and stake is refunded as a free bet; record as non-cash credit rather than a cash return.

Moneyback specials:

• If the trigger occurs (e.g., “0–0 correct score, moneyback”), the stake is refunded as cash or free bet per terms. Model cash refunds as return = stake; model free-bet refunds as a separate credit (not cash).

Cash-out:

• If you accept cash-out, your return equals the offer amount, and the bet is settled regardless of the final result. Enter the cash-out amount as the final return; do not also settle the legs.

Worked acca bonus example: Stake £10, legs at 1.60, 2.10, 1.95, 2.40 (all win). Product = 1.60 × 2.10 × 1.95 × 2.40 = 15.7248. Base return = £157.25; Winnings = £147.25.

• With +10% acca bonus: Bonus = £14.73; Total return ≈ £171.98.

• Insurance example: 5-fold, one leg loses under “acca insurance.” Cash return = £0; stake refunded as a free bet per offer terms (record as credit, not cash).

Reminder: Always mirror the exact promo rules—percentage applies to winnings only unless the bookmaker states otherwise; “moneyback” may be cash or a free bet; and voids typically return the free bet token rather than cash.

Percentage to odds: how do I convert probability into prices?

To convert a percentage chance (implied probability) into betting odds, first decide the target format. Decimal odds are the simplest: odds = 1 / probability. Fractional odds represent profit per unit stake and equal decimal − 1 expressed as a fraction. American (moneyline) odds use + for underdogs and − for favourites, derived from the same probability. The calculator can convert both ways so you can compare “fair” prices to bookmaker lines.

Implied probability from fractional, decimal and American

Implied probability is the chance the price implies, before any bookmaker margin is removed. Use these exact formulas:

• From decimal D: Probability p = 1 / D.

• From fractional a/b: Decimal D = 1 + a/b; Probability p = b / (a + b). From American moneyline M:

• If M > 0: p = 100 / (M + 100).

• If M < 0: p = |M| / (|M| + 100).

Examples:

• Fractional 5/2 ⇒ D = 3.50 ⇒ p = 1/3.50 = 28.57%.
• Decimal 1.80 ⇒ p = 1/1.80 = 55.56%.
• American +250 ⇒ p = 100/(250+100) = 28.57%.
• American −150 ⇒ p = 150/(150+100) = 60.00%.

What odds map to 40%, 55% and 2% chances?

Here are the “fair” odds (no margin) for the given probabilities, with exact or nearest-standard representations and clear rounding where needed.

Reading the table: Start from your assessed chance, take the decimal as 1/p, then subtract 1 and rationalise for fractional, or apply the moneyline formula (round to the nearest whole number) for American.

Fair odds vs bookmaker margin: why can results differ?

Bookmakers add an overround (margin), so the sum of implied probabilities across all outcomes exceeds 100%. Your “fair” odds from a model (no margin) will often be longer than listed prices. To compare like-for-like, either add a target margin to your fair prices or remove the margin from the bookmaker’s quotes.

Overround example (1X2 football): Prices 2.35 (Home), 3.20 (Draw), 3.10 (Away).

• Implied probabilities: 1/2.35 = 42.553%, 1/3.20 = 31.250%, 1/3.10 = 32.258%.
• Sum = 106.061% ⇒ Overround ≈ 6.06%.

Removing margin (normalisation):

• Compute each qᵢ = 1/Dᵢ and sum S = Σqᵢ.

• Fair pᵢ = qᵢ / S; Fair decimal = 1 / pᵢ.

• Using the example: S = 0.42553 + 0.31250 + 0.32258 = 1.06061.

• Fair p(Home) = 0.42553 / 1.06061 = 0.4019 ⇒ Fair D ≈ 2.487.

• Fair p(Draw) = 0.31250 / 1.06061 = 0.2947 ⇒ Fair D ≈ 3.392.

• Fair p(Away) = 0.32258 / 1.06061 = 0.3040 ⇒ Fair D ≈ 3.289.

Why listed odds differ:

• Built-in margin and risk management by the bookmaker.
• Market moves (supply/demand) shifting prices away from “fair.”
• Settlement rules and promotions (e.g., refunds, boosts) effectively alter value.

Practical tip: If your estimated fair probability exceeds the bookmaker’s implied probability (after removing margin), the price may represent positive expected value. Always confirm market rules (e.g., 90 minutes only in football) before comparing.

Is a bet calculator accurate compared to your bookmaker?

Yes—if your inputs match the bookmaker’s rules exactly. A bet calculator reproduces standard UK settlement logic, but any mismatch in odds format, free-bet mode (stake returned or not), each-way terms, Rule 4, dead-heats, void/push handling, bonuses, or rounding can produce different numbers. Always mirror the exact terms shown on your bet slip and the market’s settlement window (e.g., 90 minutes only in football unless stated otherwise).

What input mistakes most often skew your payout?

Most discrepancies are input-related rather than calculation errors. Check these before comparing to your bet slip or settlement page.

• Odds format mismatch: Entering 5/2 as 2.50 instead of 3.50 (decimal) under- or overstates returns.
• Free bet mode: Using cash settlement when the token is SNR (stake not returned) changes the outcome materially.
• Each-way terms: Wrong place fraction (e.g., 1/5 vs 1/4) or place count alters the place part heavily.
• Rule 4 not applied: Racing non-runners trigger published deductions on winnings only; omitting them overstates payout.
• Dead-heat handling: Forgetting to divide stake by the number of tied runners gives an inflated result.
• Void/push legs in accas: A void leg should be decimal 1.00; removing the leg or changing odds distorts the product.
• Incorrect market window: Football 1X2 is 90 minutes only by default—extra time and pens do not count unless the market specifies.
• Bonuses/insurance: Acca bonuses apply to winnings (not stake); insurance may refund as a free bet, not cash—model accordingly.
• Rounding: Books settle to the nearest penny; entering truncated (not rounded) decimals can create small differences.

Settlement quirks in UK football markets (90 mins, ET, pens)

By default, UK football markets settle on 90 minutes (regulation time plus injury time), excluding extra time and penalties, unless the market name explicitly includes them (e.g., “To Qualify,” “Lift the Trophy,” “Penalty Shootout Winner”). Asian lines have push/refund mechanics on whole/quarter lines that differ from fixed 3-way markets. Use the table to map common markets to typical settlement rules.

Always read your bookmaker’s market rules on the event page—labels such as “To Qualify,” “90 mins only,” or “Asian” determine whether pushes, voids, or extra-time events apply.

Built for UK punters: fractional-first, acca bonus and EW terms

The calculator is designed around UK settlement conventions and racing/football use-cases, so you can reproduce bookmaker results when your inputs match the slip.

• Fractional-first workflow: Enter 5/2, 10/3, 4/7 directly; the tool converts to decimal internally for accurate products in accas.
• Each-way accuracy: Configure place fraction (e.g., 1/5, 1/4) and place count exactly as offered; the tool splits stakes and settles win/place parts separately.
• Rule 4 and dead-heat handling: Apply published R4 deductions to winnings only; in dead-heats, stakes are divided by the number of tied runners before settlement.
• Acca features: Add 4–20 legs; void legs default to decimal 1.00; optional acca bonus applies to the winnings portion; insurance outcomes can be recorded as free-bet refunds where applicable.
• Football defaults: 90-minute settlement as standard; supports Asian lines (push/refund logic on whole and quarter lines), BTTS, O/U, and 1X2.
• Rounding and pennies: Outputs are rounded to the nearest £0.01 to reflect typical UK settlement.

Best practice: Before calculating, confirm market type and promo terms on your bet slip, match each-way and Rule 4 inputs to the listed terms, and mark void/push outcomes correctly. This alignment yields calculator results that match bookmaker settlements within rounding tolerances.

Frequently Asked Questions

How do I calculate an each-way accumulator (EW acca) return?

Split the total stake into equal win and place accumulators, then multiply each by the relevant decimal prices per leg; winners count for both parts, placed-only legs count for the place part only. The total payout equals win-acca return plus place-acca return, and the total outlay is doubled because you have two separate accas. Example: £10 EW (total £20) on three horses at 10/1, 6/1 and 5/2 with 1/5 place terms gives win decimals 11.00, 7.00 and 3.50, and place decimals 3.00, 2.20 and 1.50. If all three win, the win-acca return is £10 × (11.00 × 7.00 × 3.50) = £2,695.00 and the place-acca return is £10 × (3.00 × 2.20 × 1.50) = £99.00, so the combined return is £2,794.00 from a £20 outlay; if any leg only places, the win acca fails while the place acca continues provided every leg at least places.

How are multiple Rule 4 deductions combined on the same bet?

Add the published pence-in-the-pound deductions for all relevant non-runners and apply the total percentage to winnings only, usually capped at 90p in the £ by UK firms. For instance, a £40 win at 3/1 has £120 winnings pre‑deduction; two withdrawals at 20p and 10p create a 30% deduction, so adjusted winnings are £120 − £36 = £84 and total return is £84 + £40 = £124; if combined deductions reached 95p, many books cap at 90%, so £120 − £108 = £12 winnings and a £52 return. Always use the rate(s) quoted on your bet, because firms publish the exact combined deduction at settlement.

How does a dead-heat affect an accumulator leg?

Treat a dead-heat for the win as dividing the leg’s effective decimal price by the number of tied runners, because only that fraction of stake advances. Example: a two-way dead-heat on a leg priced 2.50 inside a double with a second leg at 3.00 gives an effective product of (2.50 ÷ 2) × 3.00 = 1.25 × 3.00 = 3.75, so a £10 stake returns £37.50; for a place dead‑heat on the last paid place, use the place decimal for that leg and divide it by the number tying for those remaining places before multiplying through.

Are UK betting winnings taxed for individuals?

No. UK individuals pay 0% income or capital gains tax on betting and gaming winnings, so the calculator’s return is your net payout. Operators, not customers, pay the applicable gambling duties to HMRC, so if your return is £1,000 you receive £1,000; there is no personal tax deduction on top.

How do bookmakers round returns, and how can I match it?

Most UK bookmakers round the final settlement to the nearest penny after all multiplications and adjustments. To mirror this, round the final figure to two decimals using standard half‑up convention, for example a computed return of £34.295 rounds to £34.30 and £34.294 rounds to £34.29; differences of 1–2p can occur if you round per leg rather than at the end.

When is cashing out mathematically better than letting the bet run?

Compare the cash-out offer to the expected value of continuing: the break‑even success probability equals cash_out ÷ potential_return. Example: if the potential return is £210 and the offer is £84, the break‑even probability is 84 ÷ 210 = 0.40; if your estimated chance that all unresolved outcomes win is above 40%, the EV of continuing exceeds the cash‑out, otherwise the cash‑out is superior on EV.

Does Rule 4 apply to ante-post bets and NRNB markets?

Rule 4 does not apply to ante‑post bets; ante‑post non‑runners are settled as losers unless the market was Non‑Runner No Bet (NRNB), in which case the stake is refunded. For day‑of‑race or after final declarations, Rule 4 deductions apply to the winnings portion at the published rate; for example, a £20 ante‑post at 10/1 on a non‑runner returns £0, while the same price under NRNB refunds £20, and on the day of the race a 20p Rule 4 would reduce a £200 winnings portion by £40 to £160.

How do I enter Asian handicap quarter lines like -0.25 or +0.75 in a calculator?

Split the stake equally across the two adjacent half or whole lines, then settle each part by its rule. For -0.25 at 1.90 with a £20 stake, treat it as £10 on 0.0 at 1.90 and £10 on -0.5 at 1.90; if the team draws, the 0.0 leg voids and returns £10 while the -0.5 leg loses for a £10 total return, and if the team wins both parts win for £10 × 1.90 + £10 × 1.90 = £38.00.

What happens to a free-bet accumulator if a leg voids or the whole bet voids?

A void leg settles at decimal 1.00, so the rest of the acca stands; with SNR tokens the payout excludes the free stake value, while with SR tokens it includes it. Example: a £10 SNR free-bet 3‑fold at 2.00, 2.00 and a void leg yields a product of 4.00 and an SNR return of £10 × (4.00 − 1) = £30; if every leg voids, most firms reissue the free‑bet token rather than pay cash, so the cash return is £0 and the token is returned per the offer terms.

How is an each-way dead-heat for first place settled?

The win stake is divided by the number of winners and settled at full win odds, while the place part is paid in full at the place terms because winners also place. Example: £20 EW at 8/1 with 1/5 terms dead‑heats two‑way for first; the win part becomes £10 at 8/1 returning £10 × 8 + £10 = £90, and the place part remains £20 at place odds 8/1 × 1/5 = 8/5 (decimal 2.60) returning £20 × 1.60 + £20 = £52, for a combined £142 from a £40 outlay.

How are ties settled when more runners share the last paid place than places remaining?

Apply an r/k factor to the place stake, where k runners tie for r remaining paid places, and settle that fraction at place odds. Example: if three runners tie for two remaining places (r = 2, k = 3) and your place decimal is 3.00 with a £15 place stake, the adjusted return is £15 × (2/3) × 3.00 = £30.00; the remaining one‑third stake is treated as lost.

What is the expected value of an SNR free bet, and which odds maximise it?

For a single selection, EV(SNR) = p × F × (d − 1), where p is your win probability, F is the token value, and d is decimal odds; higher d raises EV if you maintain the same edge. Example: with F = £10 and p = 0.40 at d = 2.50, EV = 0.40 × 10 × 1.50 = £6.00, while p = 0.60 at d = 1.80 gives EV = 0.60 × 10 × 0.80 = £4.80; with equal perceived edge across candidates, longer prices tend to yield higher SNR EV.

Can I include a Bet Builder in an acca, and how do voids affect settlement?

Where permitted, treat the Bet Builder as a single composite leg with its own decimal price; firm policies differ on voids, with many voiding the entire builder if any component voids. For calculation, use the builder’s composite decimal when all components stand, and replace the builder leg with 1.00 if the operator voids it; for example, a 4‑leg acca with one builder voided multiplies the remaining three legs by 1.00, leaving the product unchanged apart from that leg.

What are Trixie, Patent and Round Robin bets, and how are returns calculated?

A Trixie is 4 bets from 3 selections (3 doubles and 1 treble), a Patent is 7 bets from 3 selections (3 singles, 3 doubles and 1 treble), and a Round Robin is 10 bets from 3 selections (3 doubles, 1 treble and 6 single‑stakes‑about). Each component is settled at its own odds and summed; with a £1 unit stake the total outlays are £4 for a Trixie, £7 for a Patent and £10 for a Round Robin, and the minimum winners for any return are 2 for Trixie, 1 for Patent and typically 2 for Round Robin because SSAs require another selection to win to generate a return.

Can the calculator model Best Odds Guaranteed (BOG) settlements correctly?

Yes, compute two returns—one at the early price and one at SP—and take the higher, then apply any Rule 4 to the winnings portion of the chosen price. Example: £10 at EP 4/1 (dec 5.00) versus SP 11/2 (dec 6.50) would pay £50 at EP or £65 at SP; with a 15p Rule 4 on the winning selection, the SP winnings of £55 are reduced by 15% to £46.75 and the total return is £56.75, which still exceeds the £50 EP outcome.