Expected Value Calculator
Calculate EV & Kelly Sizing

Determine the expected value of your sports bets and get Kelly Criterion recommendations for optimal bet sizing. Free tool for profitable betting.

EV Calculator

Bet Amount ($)

American Odds

Your Probability Estimate (%)

Expected Value

$0.00

+0.00%

Interpretation

This bet has zero expected value. No edge for either side.

EV Formula

EV = (Probability × Win Amount) - (1 - Probability) × Bet Amount

Kelly Criterion: f = (bp - q) / b (using 25% fractional Kelly for safety)

How to Use the EV Calculator

Step-by-Step Guide

Enter Your Bet Amount

Input how much you plan to bet in dollars

Add the Odds

Enter American odds (e.g., +150 or -110)

Estimate Probability

Enter your estimated win probability as a percentage

Review Results

Check EV, Kelly recommendation, and interpretation

Understanding the Results

Positive EV (+EV)

You have a mathematical edge. This bet will be profitable long-term.

Negative EV (-EV)

The sportsbook has the edge. Avoid this bet to protect your bankroll.

Kelly Criterion

Optimal bet size recommendation using 25% fractional Kelly for safety.

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