Calculators

Hold calculator.

See how much a book keeps on a market. Under 2% is a low-hold market, the cheapest place to clear bonus rollover. Free, no sign up, and nothing leaves your browser.

01Odds

Odds converter

Type odds any way you have them. We show the other formats and the win chance they imply.

02Fair price

No-vig fair odds

Take the book cut out of a two-way market to see what each side is really worth.

03Book cut

Hold calculator

How much the book keeps on a market. Lower is better for you. Leave side C empty for two-way markets.

04Parlays

Parlay calculator

Every leg has to win. Add up to 10 legs.

05Hedging

Hedge calculator

Already have a bet open? See how much to bet on the other side so you get the same result either way.

06Arbitrage

Arbitrage calculator

Two books disagree enough that betting both sides wins either way. Enter both prices and your total.

07Bonus bets

Bonus bet converter

A bonus bet only pays the winnings. Hedge the other side with cash to lock in part of it.

Want us to find the best spot for it? Open the bonus bet finder.

08Boosts

Profit boost

A boost raises your winnings, not your stake. Add the fair price (from the no-vig tool) to see if it is worth taking.

09Promos

Second chance bet

Lose and the book gives your stake back as a bonus bet. Most people turn a bonus bet into 60 to 75% of its value.

10Stake size

Kelly stake sizer

Your win chance against the odds. We use quarter Kelly on every pick.

Calculators are for education. They do not account for limits, voids or rule differences between books.