Calculators

Expected Value Calculator

Use this expected value (EV) calculator to determine the average amount you can expect to win or lose on the same bet.

Expected Value Calculator

Calculate the long-term profitability of any bet. Enter your stake, the bookmaker's odds, and your true win probability to see if it's a +EV play.

Stake

Odds

Win Probability

Results

Enter stake, odds, and win probability to calculate expected value

How Does the Expected Value Calculator Work?

Our EV betting calculator runs on the universal formula for calculating expected value:

EV = (Fair Win Probability × Profit if Win) - (Fair Loss Probability × Stake)

The key distinction is between implied probability and fair win probability. Bookmakers build a margin (vig) into every market, which pushes implied probabilities above 100% across all outcomes. When you take that away, you get the fair probability, which is the number that goes into the EV formula.

Our EV betting calculator takes three inputs:

Your stake: the amount you plan to wager
Your bet odds: the decimal odds on offer at your bookmaker
Fair win probability: the true win probability after the vig is removed

When you enter all three, the calculator returns your expected value in dollars, clearly flagging whether the bet has a positive expected value (+EV) or negative expected value (-EV). It also shows EV%, which is the expected value as a percentage of your stake.

How to Use the Expected Value Calculator

Here’s a step-by-step guide on how to use our EV betting calculator

Step 1: Enter your stake.
Type in the amount you plan to wager.

Step 2: Enter your bet odds.
Input the decimal odds on offer at your bookmaker for the selection you want to bet on. Make sure these are decimal odds, for example, 2.20, not +120.

Step 3: Find your fair win probability.

You need the true probability of the outcome, with the bookmaker's margin removed. There are two ways to get it:

Manual method: Find the no-vig "fair" odds from a sharp bookmaker. Then divide 1 by those odds. For example, fair odds of 2.00 give you a fair win probability of 1 ÷ 2.00 = 50%
Faster method: Input the market odds into Betsniper's fair odds calculator. It take out the vig and gives you the fair odds and true probability automatically

Step 4: Enter your fair win probability.

Type the percentage into the calculator

Step 5: Read your result

The calculator instantly returns your expected value in dollars. A positive number means the bet is +EV and worth placing. A negative number means the bookmaker has the edge.

Example

Let’s say you want to bet $50 on a team priced at 2.20 at your bookmaker. You check a sharp bookmaker (or use our fair odds calculator), and after taking out the vig, the fair win probability comes out at 52%.

When you input those terms, the EV calculator finds that

Profit if win: $50 × 2.20 - $50 = $60
Loss if lose: $50

It automatically applies the EV formula:

EV = (0.52 × $60) - (0.48 × $50) = +$7.20 [14.40% of $50]

On a $50 stake, you can expect to profit $7.20 on average every time this bet is placed under the same conditions.

When to Use the EV Calculator

Use it before placing any bet where you think you've found an edge. Specifically:

When a bookmaker's odds look higher than what sharp books are offering
When you want a quick check that a bet is actually worth placing
When you're comparing odds across multiple bookmakers
When you want to stay away from high-vig props and parlays that eat into your bankroll quietly

Positive EV betting is the only mathematically proven long-term edge in sports betting. The EV calculator is how you identify those opportunities, one bet at a time.

Frequently Asked Questions

What is expected value in sports betting?

Expected value (EV) is the average profit or loss you can expect from a bet over a large number of repetitions. A positive EV bet is one where your estimated true win probability is higher than the probability implied by the bookmaker's odds. Positive EV bets are profitable in the long run, while negative EV bets are not.

How do I calculate expected value (EV)?

You can calculate expected value using the formula: EV = (Fair Win Probability × Profit if Win) - (Fair Loss Probability × Stake). For example, let’s assume you want to stake $100 on odds of 2.00, but your own fair win probability is 55%. The expected value would be (55% × $100) - (45% × $100), which equates to +$10. Our positive EV betting calculator helps you skip the manual calculations and get your result with just a few inputs.

Why does expected value matter?

Expected value tells you whether a bet is worth taking. Most recreational bettors place negative EV bets without realising that they're paying the bookmaker's margin on every wager. Consistently finding and placing positive EV bets is how professional bettors build a sustainable edge over time.