Calculators

Matched betting

Back stake: the amount placed with the bookmaker. Enter decimal odds for the same selection at the bookmaker and exchange.

Commission: your exchange’s rate. Liability: the balance needed to cover your lay bet.

Free bet: choose whether the promotional stake is returned as cash. Free-bet results exclude any earlier qualifying cost.

The calculator balances both outcomes and rounds the lay stake to the nearest penny. The headline cost or net result uses the lower outcome, after commission. Exchange settlement rounding may differ.

Both bets must be fully matched with compatible settlement rules. Commission assumes no other bets on that exchange market. Check offer terms and available prices.

2Up early payout

The initial back-and-lay position is balanced. The ordinary result uses the lower net outcome, after commission.

A double win requires an eligible early payout and the team then drawing or losing. The extra result is conditional, not an expected return.

Assumes no further trades, fully matched bets and compatible settlement rules. Check offer terms. No in-play cash-out is modelled.

Odds converter

Decimal: 2.50 · Fractional: 3/2 · American: +150 · Probability: 40%.

Implied probability is the break-even win rate in the price, including bookmaker margin. It is not a prediction. Fractional and American results are approximate.

Expected value

EV = stake × (offered odds ÷ fair odds − 1).

Your fair odds are an estimate. EV is the modelled average across repeated bets, not this bet’s payout. Fees and offer conditions are excluded.

Kelly stake model

A mathematical stake based on your estimated win probability and chosen Kelly fraction. A zero stake means no positive Kelly allocation.

The model assumes an accurate probability and one bet, with no fees or correlated positions. Small probability errors can change the result substantially. The output is not a safe stake or a guaranteed return.

Two-outcome split

Splits a budget between two mutually exclusive outcomes covering every result. Rounded stakes add up to your budget.

A win/draw/win market has three outcomes and is not covered. Both bets must be accepted at these odds with compatible settlement rules. Fees and voids are excluded.