Seven sports-betting math tools that run entirely in your browser. Price a parlay, convert odds, remove the vig, measure a book's hold, size a Kelly stake, check for an arb, and compute expected value.
No signup. No email. Nothing you type leaves your device; every calculation runs client-side.
Use it to price a multi-leg bet: combine 2 to 12 legs into one price, payout, and combined implied probability.
/tools/parlay-calculatorUse it when a price is in the wrong format: American, decimal, fractional, and implied probability, all in sync.
/tools/odds-converterUse it to find the fair price: strips the bookmaker margin from a 2-way or 3-way market to get no-vig probabilities and odds.
/tools/no-vig-calculatorUse it to compare how expensive books are: enter every side of a market and see the hold percent, vig, and overround.
/tools/hold-calculatorUse it to size a bet: turns your edge and the odds into an optimal stake fraction, with half and quarter Kelly for risk control.
/tools/kelly-calculatorUse it when two books disagree: checks whether the prices lock in a guaranteed profit, with the exact stake split.
/tools/arbitrage-calculatorUse it to judge one bet: compares your price to a fair probability and shows the expected value in percent and dollars.
/tools/ev-calculator