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Free sports betting calculators

Every calculation a bettor needs, free and without an account: convert odds, measure the vig, work out parlay and round robin payouts, hedge an open bet, split a stake across outcomes, price a bet's expected value and size it with Kelly. Pick a calculator below, enter your numbers and read the result instantly.

Frequently asked questions

Are these betting calculators really free?

Yes. Every calculator on this page works without an account and without a subscription. A free account only adds the Bet Tracker, where you can save the bets you calculate and follow your real profit.

Which odds formats do the calculators accept?

American odds by default, and decimal odds with one click. The odds converter also reads fractional odds and prediction market prices in cents, so you can compare any price you find.

Do the calculators include the sportsbook's vig?

The odds you enter already contain the vig. The no-vig calculator strips it out to show the fair price, and the EV and Kelly calculators compare your odds with the fair ones to tell you whether a bet has value.

Can I share a calculation?

Yes. Every calculator writes your numbers into the page address, so the link you copy opens the same calculation for anyone you send it to.

Do the calculators find bets for me?

No, they do the math on the prices you enter. NinjaBet's scanners are what find the prices: the Bet Finder, SureBet and ValueBet compare licensed sportsbooks live and open the calculator already filled in.