Convert odds, remove a bookmaker margin, and calculate theoretical arbitrage stakes in your browser.
Use the odds converter for decimal, American, and fractional formats. Use the no-vig calculator to normalize implied probabilities across a complete market. Use the arbitrage calculator for theoretical equal-payout stakes.
Calculations run in your browser. Enter your own prices. The calculators use the arithmetic described on each page.
Convert decimal, American, and fractional odds and see their implied probability. Free, with no signup.
Explore →Remove the overround from two-way or three-way decimal odds using proportional normalization.
Explore →Calculate theoretical stakes, equal payouts, and net results from two or three decimal prices.
Explore →Explore the API reference and register interest in the private developer beta.