Free sports betting calculators
Every calculation a bettor needs, free and without an account: convert odds, measure the vig, work out parlay payouts (with the round robin parlay calculator for system bets), 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.
Odds basics
Parlays and round robins
Hedging and arbitrage
Bonus bets and promotions
- Playthrough calculator How much to wager to unlock a bonus, and what it is really worth.
- Bonus bet converter The hedge that turns a bonus bet into cash, and how much you keep.
- Second chance bet calculator The hedge for a second chance bet, with the refund counted at its cash value.
- Profit boost calculator Boosted odds and the hedge that turns a profit boost into a fixed profit.
- Site credit calculator The hedge that turns site credit into cash, and the share you keep.
Value and bankroll
The calculators inside NinjaBet
The same engines our members use next to the live odds scanners, free to try.
- Try the free matched betting calculator Free matched betting calculator: enter your sportsbook bet and the odds of the opposite outcome to get the hedge stake and the result for every outcome. Cash, bonus bets, second chance bets, playthrough and profit boosts. Open the calculator →
- Try the free surebet calculator Free arbitrage (surebet) calculator: enter the odds of two or three sportsbooks on opposite outcomes and get the stake split, the margin and the profit of an arb. Open the calculator →
- Try the free valuebet calculator Free valuebet calculator: enter the sportsbook odds and the fair odds to get your +EV edge, the expected value and the suggested Kelly stake. Open the calculator →
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.
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