Free Betting Calculators

Nine free tools, no signup. The same math OddsOps runs on every game we post.

Odds Converter

Free odds converter. Instantly turn American odds into decimal, fractional, and implied win probability — and back.

Free parlay calculator. Add your legs, see the combined odds and exact payout on any stake.

Free +EV calculator. Enter the odds you're getting and the fair odds to see your expected value in % and dollars.

Free no-vig calculator. Enter both sides of a market to see the book's hold and the true, vig-free fair odds.

Free bet calculator. See exactly what a sportsbook free bet is worth and its cash conversion rate at any odds.

Free hedge calculator. Find exactly how much to bet on the other side to guarantee the same profit no matter what.

Free arbitrage calculator. Split your stake across two books for a guaranteed profit — see the stakes and the arb %.

Free Kelly criterion calculator. Enter your edge and bankroll to get the mathematically optimal bet size (full and fractional Kelly).

Free break-even calculator. See the exact win rate you need to profit at any betting odds.

Every pick tiered, unit-sized, posted before games — and graded publicly when they end. Wins and losses, on the record, forever.