Free calculators

Six tools. The formula on every result.

Six free tools for the math behind a bet: expected value, fair odds without the bookmaker margin, odds conversion, parlay combining, line movement, and closing-line value. No account, no email, no affiliate link, every result shows the formula and the moment you'd actually reach for 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.

When you'd use it: Before you place anything: is this price even worth it at your number?

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.

When you'd use it: When two books disagree and you want the real fair price, not the juice.

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.

When you'd use it: Anytime a price is in a format you don't use, or you want the probability behind it.

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.

When you'd use it: Sunday morning, when a 4-leg ticket looks free and you want the real combined price.

The math

combined = odds₁ × odds₂ × ... × oddsₙ

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Line Movement

Enter an open price and a current price. See implied-probability shift, pure arithmetic, no sharp/public claims.

When you'd use it: When the number moved and you want to know by how much, in probability terms.

The math

Δimpl = impl(current) − impl(open)

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CLV Calculator

Closing-line value in basis points from your decision price vs the close. Your prices only, not a Galaxy track-record claim.

When you'd use it: After the game: did your price beat the close? That's the honest scoreboard.

The math

CLV bps = 10000 × (1/close − 1/decision)

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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

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