Betting Calculators -

Betting Calculators

Odds & Profit Calculator

Fractional (e.g., 5/2 or 4-1) Decimal (e.g., 2.50) American (e.g., +150 or -120) Stake (£)

Implied Probability: —

Profit (£): —

Return (£): —

How this works

Decimal → Implied prob = 1 / decimal.
Fractional a/b → Decimal: 1 + a/b.
American: +X ⇒ 1 + X/100, −X ⇒ 1 + 100/|X|.
Profit: (decimal − 1) × stake. Return = profit + stake.

Acca / Parlay Calculator

Stake (£)

Actions

Total Decimal Odds: —

Return (£): —

Profit (£): —

How this works

Each leg converts to decimal (Fractional a/b ⇒ 1 + a/b, American +X ⇒ 1 + X/100, −X ⇒ 1 + 100/|X|).
Total odds = product of all leg decimals.
Return = total odds × stake. Profit = return − stake.

Lay / Exchange Calculator

Mode Exchange Commission (%)

Back Odds (Decimal) Back Stake (£) Lay Odds (Decimal) Lay Stake (£)

Liability (£): —

Profit if Back Wins (£): —

Profit if Back Loses (£): —

How it’s calculated

Equalised lay stake: L = S × K / (O_L − c) where:
• Normal: K = O_B • SNR: K = (O_B − 1)
and c is commission as a decimal (e.g., 2% ⇒ 0.02)
Liability: (O_L − 1) × L
Back wins (normal): (O_B − 1)×S − Liability
Back wins (SNR): (O_B − 1)×S − Liability
Back loses: L × (1 − c) − S (SNR: L × (1 − c))

Each-Way (EW) Calculator

Odds Type Odds EW Terms Total E/W Stake (£)

Stake Split

Win: — • Place: —

Win Odds (Dec): —

Place Fraction: —

Place Odds (Dec): —

Outcome: WIN

Return: —
Profit: —

Outcome: PLACE Only

Return: —
Profit: —

Outcome: LOSE

Return: —
Profit: —

How EW is calculated

Your total stake is split 50/50: half on Win, half on Place.
Place odds (decimal) = 1 + (WinDecimal − 1) × placeFraction (e.g., 1/5, 1/4).
WIN outcome: Return = WinStake × WinDecimal + PlaceStake × PlaceDecimal.
PLACE-only: Return = PlaceStake × PlaceDecimal (win part loses).
LOSE: Return = £0. Profit in each case = Return − TotalStake.

Notes: No Rule 4, dead-heat, or R4/NR deductions here (can be added later). “Places paid” doesn’t affect the math beyond the place fraction.

Arbitrage Finder (Bookie vs Bookie)

Market Type Total Stake (£)

Implied Sum (%): —

Guaranteed Return (£): —

Profit (£) / %: —

How this works

Enter the **best odds** for each outcome from **different bookmakers**.
We compute pᵢ = 1/Oᵢ and Σp. If Σp < 1, it’s an **arb**.
Stakes: Sᵢ = S × (pᵢ / Σp). Each bet returns the same amount.
Return: R = S / Σp. Profit: R − S. Profit%: (1/Σp − 1)×100.
If “Not an arb”, your combined prices are ≥ 100%. Hunt better odds. 😉

Arbitrage Finder (User-Friendly)

Market Type Total Stake (£) Rounding Preserve Total Stake

Commission per Outcome?

Actions

Implied Sum (%): —

Target Equal Return (£): —

Profit (£) / %: —

How this works

Enter best odds for each outcome (Decimal / Fractional / American supported).
We compute pᵢ = 1/Oᵢ (using effective odds if commission is on). If Σp < 1 → ✅ Arb exists.
Stakes: Sᵢ = S × (pᵢ / Σp). Target equal return: R = S / Σp.
Rounding: choose increment. “Preserve Total Stake = Yes” adjusts the last leg so bankroll stays exact (returns may differ by pennies).
Commission (per outcome) reduces profit part: effective decimal = 1 + (O − 1) × (1 − c).

Tip: Use “Copy All Stakes” then paste into your notes. Always double-check bookie rules and settlement.

Please gamble responsibly

18+. Odds change. Check offer T&Cs. If gambling becomes a problem, contact the National Gambling Helpline on 0808 8020 133 or visit BeGambleAware.org. You can self-exclude at GAMSTOP.co.uk.

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