Odds Value Calculator

Calculate expected value (EV) for your snooker bets and convert between odds formats.

Expected Value Calculator

Implied Probability
40.0%
From the odds
Expected Value
+£1.25
12.5% per unit
EV Verdict
+EV (Bet)
Edge in your favour
Kelly Stake
8.3%
Of bankroll (full Kelly)

Odds Converter

Decimal
2.50
Fractional
3/2
American
+150
Implied probability: 40.0% | Potential return on £10: £25.00 (profit: £15.00)

How to Use This Calculator

Enter the bookmaker's decimal odds for a selection, then enter your estimated probability that the outcome occurs (as a percentage). The calculator will tell you whether the bet has positive expected value (+EV) and suggest an optimal stake using the Kelly Criterion.

What Is Expected Value?

Expected value (EV) measures the average profit or loss per bet if you placed the same bet many times. A positive EV means the odds are in your favour — the bookmaker has priced the outcome too generously. Professional bettors only place bets with positive EV.

Odds Conversion

The converter supports three formats: Decimal (e.g., 2.50), Fractional (e.g., 3/2), and American (e.g., +150). UK bookmakers typically show fractional odds, while exchanges like Betfair use decimal.