Betting tools and calculators
Calculators for the maths of betting and tools built on our data: teams, players, scores. All free, all in your browser, nothing is sent anywhere.
Betting maths
Your odds and probabilities in, numbers out. The calculators run locally.
Odds to probability calculator
Decimal odds into implied probability, fair odds and edge.
Bookmaker margin calculator
The overround of a 1X2 and the fair prices without it.
Stake size and Kelly calculator
Stake in units with full and quarter Kelly.
Accumulator odds calculator
Combined odds, return and probability of up to six legs.
Dutching calculator
Split one stake across several outcomes so the return is the same whichever of them wins.
Arbitrage (surebet) calculator
Check 2 or 3 outcomes for a surebet and get the stake split and the locked profit.
Value bet and edge calculator
Your probability against the odds: implied probability, fair odds, expected value and the Kelly fraction.
Asian handicap calculator
Settle any Asian handicap line, including quarter lines, on a final score and see the split stake.
Poisson score and over/under calculator
Expected goals for each team in, score matrix 0-5, 1X2, over/under 0.5 to 4.5 and BTTS out.
Bankroll tracker
Log your bets, watch the balance and ROI, export CSV. Saved in your browser only, no account.
Team and player tools
Built on our own data: the weekly Power Ranking and the player Impact Ranking.
Team vs team comparison
Pick two clubs from the Power Ranking: rating, goals for and against, win/draw/loss probabilities and expected goals.
Player vs player comparison
Two players side by side: Impact Index, goals, assists, games, xG/xA where present, value, age and club.
Score predictor from the Power Ranking
Pick two clubs and get the Poisson score matrix from their ranking strengths: most likely scores, 1X2, over 2.5, BTTS.
18+ only. The tools are educational maths over your own numbers or our published data, not betting or financial advice. All tools