Betting calculators
Free calculators for the arithmetic behind a betting line: convert odds between formats, take the book’s margin out of a market, measure its hold, and work out the expected value of a price at a chance you estimate.
- Odds converterAmerican, decimal and fractional odds and the chance each implies, in one place.
- No-vig calculatorFair chances and fair odds from both sides of a two-way line, with the book’s hold.
- Hold calculatorHow much a two- or three-way market keeps: overround and hold from its prices.
- Expected value calculatorThe expected value of a price at your own estimate of the chance, and its break-even rate.
What they are
Each calculator works in your browser on the prices you type in and shows its formula in plain words with a worked example. They do arithmetic only: they cannot tell you how likely an outcome is, and the expected value is only as good as the estimate you give it.
Arithmetic on the numbers you enter, for research. It is not betting advice: Keel Stats sells no picks and links to no sportsbook. Responsible gaming