15 Free Betting Calculators

Convert between decimal, fractional, American, and implied probability odds formats.

Calculate returns on singles, doubles, trebles, and accumulators with up to 10 legs.

Calculate the overround/margin on any market to find the best value odds.

Calculate potential returns on multi-leg bets (parlays) with up to 10 selections.

Calculate all possible 2-pick and 3-pick combinations from 3-8 selections with returns.

Calculate returns for a Trixie bet: 4 bets from 3 selections (3 doubles + 1 treble).

Calculate returns for a Yankee bet: 11 bets from 4 selections.

Calculate returns for a Lucky 15 bet: 15 bets from 4 selections.

Calculate lay stake, liability and profit for exchange betting (e.g. Betfair).

Calculate optimal stakes across multiple selections to guarantee equal profit.

Determine optimal stake size using the Kelly Criterion formula for bankroll management.

Determine whether a bet offers positive expected value based on your probability estimate.

Calculate win and place returns for each-way bets with custom terms.

Calculate flexi percentage and cost for Australian exotic bets (Trifecta, First Four, Quinella).

Compare tote dividends against fixed odds to determine which pays better.