Kelly Criterion Calculator: Optimal Bet Size for Sports
Free Kelly criterion calculator for sports betting: enter your odds and fair win probability and see full, half or quarter Kelly stakes in units, plus dollars.
Free tools
Free betting calculators
The calculators sharp bettors use every day: expected value, no-vig fair odds, Kelly stakes, odds conversion and vig. No account, no sign-in, nothing sent to a server; results update as you type.
Odds Converter and Implied Probability Calculator
Free odds converter and implied probability calculator: convert American, decimal, multiplier and fractional odds instantly, with formulas and worked examples.
Betting EV Calculator: Expected Value of Any Bet
Free betting expected value calculator: enter your odds and a fair probability, fair odds or both sides of a sharp line for EV % and expected profit per bet.
No-Vig Calculator: Fair Odds by the Power Method
Free no-vig calculator: remove the vig from any 2-way or 3-way line and see fair probabilities and odds by the Power method, with other methods for comparison.
Vig Calculator: Juice, Hold and Overround of Any Bet
Free vig and hold calculator for sports betting. Enter every side of a market to see the sportsbook's overround, hold percentage and the break-even win rate.
Learn the math behind the tools
- Value Betting: How to Find Positive EV (+EV) Bets
- Arbitrage Betting: Stake Math, Examples and Real Risks
- How to Devig Odds: Vig, Hold and the 4 Devig Methods
- Parlay EV: Are Parlays Worth It? The Math Explained
- Profit Boost Strategy: Which Bets to Boost and Why
- Kelly Criterion in Sports Betting: Formula and Examples
- Implied Probability in Betting: Formula and Examples
- Sports Betting Bankroll Management: Flat vs Kelly
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