Free odds tools
Odds calculators and tools
Practical calculators for reading prices, comparing outcomes and planning a stake. Enter a number and see the result right away.
No-vig calculator
Remove a market's built-in margin with multiplicative and power methods.
Hedge calculator
Set a second stake to make the result the same either way.
Kelly calculator
Size a stake from price, your estimate and bankroll.
Middles calculator
See the score window where two spread or total bets both pay.
Odds converter
Move between American, decimal, fractional and implied probability.
Implied probability
Turn a price into its market-implied chance.
Parlay calculator
Combine legs and calculate total price and payout.
Prices on this page can be prefilled from the OddsLink API.
Bring live prices into your workflow.
Use the OddsLink API to get prices from the books you follow in one response shape.
Frequently asked questions
Are these tools free?
Yes. They are available without an account and run in your browser.
Do these tools place bets?
No. They only calculate from the prices and stakes you enter.
Which odds formats can I use?
The tools accept the common US and European formats where relevant, and the converter also handles fractions.
Can I use live prices?
You can enter live prices manually today. The prefill hook is ready for a later OddsLink API connection.
Why do results change as I type?
Each calculator updates immediately, so there is no submit step to wait for.