Tools

Calculators that do the market math.

Last updated 2026-07-03

Free, no signup, no ads. Each tool runs entirely in your browser and shows the API call that does the same job programmatically.

Odds Converter

American, decimal, fractional, and implied probability. Type any one, get the other three.

No-Vig Fair Odds Calculator

Strip the bookmaker margin from any two-way or three-way market to find the true implied probabilities and the hold percentage.

Arbitrage Calculator

Check whether two or three prices across books form an arb, and split your stake for equal profit on every outcome.

Closing Line Value (CLV) Calculator

Compare the price you took against the closing line to measure whether you beat the market.

Parlay Calculator

Combine up to eight legs into true parlay odds, payout, and implied probability. See how the book's parlay price compares.

Doing this at scale? Every number these tools compute is available programmatically: live odds from 50+ books via /odds/, vig-removed fair prices via /intelligence/fair-odds, and precomputed cross-book edges via /edges/. Free key in minutes.