Expected Value (EV) Calculator
Quick Facts
- Calculates expected value and ROI.
- Inputs: odds, your probability, stake.
- Outputs: EV per outcome and overall.
How to use
Steps
Add odds and your estimated probability for each outcome. Set a stake to see EV and ROI per outcome and in total.
Formula & definitions
Formula: EV = Stake × (p × odds − 1)
- Expected Value
- Long-run average profit/loss per bet.
- ROI
- EV as a percentage of stake.
Expected Value (EV) Calculator
| Odds | Your Probability | EV (Profit) | ROI | |
|---|---|---|---|---|
0.00 | 0.00% | |||
0.00 | 0.00% |
What is Expected Value (EV) in Sports Betting?
The EV Calculator is your essential tool for finding +EV (positive expected value) bets—helping you bet smart, not just for fun! Instantly see the mathematical edge of your bet based on your probability and the odds offered by the sportsbook.
How Does the EV Calculator Work?
Expected Value (EV) is the long-term average profit or loss you can expect from a bet if you placed it many times. Our calculator lets you enter your odds (decimal, American, or fractional), your estimated probability (as % or decimal), and your stake amount.
- Find +EV bets to compare value versus the market
- Calculate ROI (Return on Investment) for every outcome
- Great for sports trading, value betting, and bankroll growth
How to Use the OddsX EV Calculator
- Enter the odds for each outcome (choose your preferred format).
- Enter your probability for each outcome (e.g. 0.52 or 52%).
- Set your stake per bet.
- See your expected profit (EV) and ROI per bet and in total!
+EV bets are the fastest way to grow your bankroll long-term!
Updated 03 Apr 2026 SAST
Why it matters
Use the Expected Value (EV) Calculator to sanity-check prices, remove guesswork, and make faster decisions when odds move.
Example
Example: Odds 2.20, win probability 55%, stake ZAR 100. EV ≈ 21.0, ROI ≈ 21%.
Who it's for
Ideal for online sports betting analysis when you want to rank value and +EV bets.
Use cases
- Score value across sports betting apps using your own probability.
- Compare expected value between sports betting sites for the same fixture.
Practical tips
- Verify the odds are still live before relying on the output.
- Treat the results as guidance, not a guarantee.
- Compare multiple sportsbooks to validate value.
FAQs
What’s +EV?
A positive expected value; on average beneficial long-term.
Can I enter % or decimals for probability?
Yes—both 52 and 0.52 are supported.
Does EV guarantee profit?
No—EV is an average over many trials, not a promise.
How does EV help with sports betting?
It helps you compare value, not just the highest odds.