Interpreting EV: What Does 120% Expected Value Really Mean?
You’ve seen the EV% column on vibeodds. You know that anything above 100% is "good." But what does a figure like 120% EV actually mean for your bottom line?
Understanding this number is crucial for trusting the process and managing your expectations.
The Definition of EV%
EV (Expected Value) is the ratio of the payout you get vs. the payout you should get based on the true probability.Decoding the Number: ROI
The easiest way to interpret EV is to look at the Return on Investment (ROI).
Formula:ROI = EV% - 100%Example: 120% EV
If you see a bet with 120% EV, it implies a theoretical 20% ROI.This means:
You expect to make £20 profit on average, over the long run*.
It does not mean you will win this specific bet. It means the price is 20% better than it should be.
Visualizing the Edge
Imagine a coin toss (50/50 chance).
If you flip that coin once, you either win £14 or lose £10.
But if you flip it 1,000 times, you are mathematically guaranteed to make huge profits because of that 20% edge.
Why Higher Isn't Always Better
You might think, "I'll only bet on 150% EV or higher!"
Be careful. Extremely high EV figures (e.g., 180%+) can sometimes indicate:
1. Market Error: The bookie has posted a palpable error (e.g., swapping odds for two horses).
2. Missing Info: The horse might have just thrown its jockey at the start, and the bookie hasn't updated the odds yet.
3. High Variance: Often, high EV comes from longshots (e.g., 50/1 odds). These lose 98% of the time, making the variance painful.
A "sweet spot" of 105% to 130% often provides the most sustainable, steady growth.
The Role of Volume
A 20% edge (120% EV) is massive, but only if you place enough bets.
This is why tools like vibeodds are essential—they help you find enough volume to let the EV realize itself.
Conclusion
When you see 115% EV on the [Live Odds page](/), read it as: "This bet offers a 15% expected return on my stake."
It’s an investment metric, not a crystal ball.
To learn more about the foundational math, revisit our Expected Value Guide. Then use the [Value view](/value) to find those edges live, and the [Results view](/results) and [Selections view](/selections) to see how your EV decisions actually performed.