Free betting calculators
Odds calculator & converter
Free odds calculator: convert American, decimal and fractional odds, get the implied probability and the payout for any stake. No sign-up.
Parlay calculator
Free parlay calculator: add up to 20 legs in American or decimal odds and get the parlay odds, payout and the real chance that every leg hits.
No-vig fair odds calculator
Free no-vig calculator: enter both sides of a market and get the sportsbook margin, the fair (no-vig) probabilities and fair odds. Works for 2-way and 3-way markets.
Expected value (EV) calculator
Free EV calculator for sports betting: enter the odds and your win probability to get the expected value, EV percentage, break-even probability and fair odds.
Is your hit rate real?
Free hit rate checker for player props: enter how many times a player went over the line and the odds, and see whether the record is distinguishable from chance.