Free calculators

Math you can read, not math you have to trust.

Four small, free tools for the math behind a bet: expected value, no-vig fair odds, odds conversion, and parlay combining. No account, no email, no affiliate link — every result shows the formula that produced it.

EV Calculator

Enter your own win-probability estimate and a price. See the expected value per dollar staked, and exactly where the breakeven probability sits.

The math

EV = p × decimal − 1

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No-Vig Calculator

Strip the bookmaker's margin out of a two-way (or n-way) market and see the fair, no-vig probability on each side, plus the hold percentage.

The math

fair_i = (1/odds_i) / Σ(1/odds_j)

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Odds Converter

American, decimal, and implied probability, all from one input. Type a price in either format and see all three update together.

The math

decimal = 1 + A/100 (A > 0)

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Parlay Calculator

Combine two or more legs into a parlay's total decimal price, American price, and implied probability, assuming independent legs.

The math

combined = odds₁ × odds₂ × ... × oddsₙ

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Why these are free

Same posture as the rest of the site.

Free, not affiliate bait

No email wall, no account, no download. A lot of odds converters exist to funnel you toward a sportsbook signup link; these don't carry any partner links at all.

The formula is always visible

Every result sits next to the exact formula that produced it, in plain math notation. Nothing is a black box, and nothing here claims to predict an outcome.

Judgment calls are named, not hidden

Where more than one honest convention exists — the no-vig method, how a parlay's legs are assumed to combine — the page says so in a one-line note next to the result.

Want to see the model these formulas feed?

These calculators are generic — the same math anyone can run by hand. Our methodology page explains how the pick engine itself reads the board.

Read the methodology Today's board

Sports wagering is real risk. Only stake what you can afford to lose without changing your week. If you or someone you know has a gambling problem, call 1-800-GAMBLER.