Odds ⇄ Probability Converter + EV Calculator
Convert decimal odds to implied probability, compute break-even win rate and expected value (EV) against your own probability estimate.
Also available in 한국어
The amounts you entered are included in the link. Anyone with the link sees the same result.
Expected value (EV)
0.00% ($0)
- Implied probability
- 50.00%
- Profit if you win
- 10원
How it was calculated
- 50.00%01Implied probability = 50.00%
1 ÷ 2 — 1 ÷ odds — win probability baked into the odds (before margin)
Basis: Decimal odds definition (odds = 1/p)
- 50.00%02Break-even win rate = 50.00%
Minimum win rate to break even long-term — your true rate must exceed this for positive EV
Basis: Probability where EV = 0
- 0.00%03Expected value (EV) = 0.00% of stake
EV = p×(odds−1) − (1−p) = 0.5 × 1.00 − 0.50
Basis: Expected net profit per unit staked
- 04Payout structure
If you win: total payout 20 (stake 10 + profit 10); if you lose: −10
Reference simulation only, not tax advice. Verify with official sources before filing or paying.