Free tools
Betting calculators
The arithmetic sharp bettors and modellers use every day, free and without sign-up. Each calculator runs in your browser, explains its formula and works with the decimal prices the PinnRadar API delivers.
No-vig fair odds calculator
Strip the bookmaker margin from any market and see the fair odds, with four de-vig methods and live Pinnacle prices to try.
Open →CalculatorOdds converter
Convert between decimal, American, fractional, implied probability, Hong Kong, Malay and Indonesian odds.
Open →CalculatorClosing line value calculator
Measure a bet against the no-vig closing price: CLV, expected value and the probability edge you took.
Open →CalculatorKelly criterion calculator
Size a stake from your price, your win probability and your bankroll, with full or fractional Kelly.
Open →CalculatorArbitrage calculator
Split a stake across two or three outcomes so every result pays the same, and see the locked-in profit.
Open →Want live Pinnacle prices for these calculators as JSON? Start on a free key: just an email, and no Pinnacle account.
Get a free key →Built around a sharp reference price
Most of these calculations need a fair price to compare against. The usual choice is Pinnacle’s, because its margin is low and it moves on informed money. You can see current prices on the live Pinnacle odds board and the biggest moves on the odds dropper, or stream all of it into your own code with the odds API.