Betting Calculators

Calculator suite

This hub links to durable math tools that help organize sports betting research. Each calculator runs entirely in your browser — no account, no live odds feed, no tracking of your inputs.

Use these tools to estimate fair odds, evaluate expected value, size stakes responsibly, convert bonus bets, and plan hedges.

No-vig and fair odds

The no-vig calculator removes bookmaker margin from American odds to show normalized fair probabilities. Use two-way mode for moneylines or spreads, 3-way / multi mode for three or more outcomes, or implied mode for a single price.

Expected value (EV)

EV compares your estimated win probability to the price. Positive EV means you believe the bet is priced in your favor over many trials — but variance is real and estimates can be wrong.

Kelly criterion and bankroll limits

Kelly stake sizing uses your edge and odds to suggest a stake. Full Kelly can be aggressive; fractional Kelly (quarter or half) is usually more durable. Set bankroll ceilings before you play.

Free-bet converter

Free bets return only profit (stake not returned). Use longer odds to maximize conversion rate, or hedge to guarantee a cash payout regardless of outcome.

Hedge calculator

Basic two-way hedge math to lock in profit or minimize loss on an existing bet. This is an honest calculator — not an arb scanner or live odds feed.

FAQ

Are these free sports betting calculators?

Yes. Every calculator on this page runs in your browser without signup, account, or payment. They are client-side math tools for research.

Do these calculators guarantee profit?

No. They help you organize math. Sports betting involves risk, and nothing here guarantees outcomes or profit.