Tools

Free sports betting calculators

Pure-math utilities that work without an account. Stripped-vig probabilities, Kelly bet sizing, and odds conversion — the same math powering our live edge tables across NBA, NFL, MLB, NHL, EPL, MLS, UCL, and PGA Tour.

No-vig calculator

Strip the vig out of sportsbook prices to see the true implied probability of each side. The standard reference for cross-book and Kalshi comparisons.

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Kelly criterion calculator

Compute optimal bet size given your edge, the price, and your bankroll. Full Kelly + fractional (¼, ½) Kelly recommendations.

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Odds converter

Convert between American (-150), decimal (1.67), fractional (2/3), and implied probability (60%) instantly. The Rosetta Stone for betting math.

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Parlay calculator

Compute parlay payout and see the compounded vig cost. 2-12 legs, real-time fair-value comparison so you know exactly what the book is charging you.

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Need definitions? See the sports betting glossary for plain-English explanations of every term used in these calculators.