EV stands for Expected Value. On a Gecko Edge analysis it is the gap between the model’s fair price for an outcome and the bookmaker’s price for the same outcome, expressed as a percentage. A +5% EV means the bookmaker is offering 5% more than the fair price. A -2% EV means the bookmaker is pricing the outcome shorter than the fair price. Positive EV is the prerequisite for a result being worth a closer look; negative EV means the price is not there.
The mechanics: the model produces a probability for the outcome, say a 50% chance of Over 2.5 Goals. That probability converts to fair odds, in this case 2.00, the minimum price you would take and still be getting value. The bookmaker offers a price to compare against, say 2.10. The 5% gap between 2.10 and 2.00 is the +EV. The same logic runs across every market in the analysis, so a +EV % attaches to each side of every line.
Three things catch people out. +EV is not a certainty: it is a price-versus-probability comparison at one moment, and a +5% EV outcome can still lose; over many +EV decisions the maths is on your side, while any single result carries variance. +EV is not a stake instruction: the number says whether the price is worth engaging with, and how much to stake, or whether to act at all, stays with you. And EV moves with the market: a line at +6% three hours before kick-off can drop to +1% or go negative as the price shortens, which is why the reading current at your decision is the one that counts.
Use EV alongside Sanity. A high-EV, low-Sanity result flags a big price gap on shaky inputs. A high-Sanity, low-EV result is confident analysis the market has already absorbed. The two indicators most users look for together are Sanity 7+ and +EV 5%+.
One note on the two views: the EV in a single-fixture analysis is the most current, fixture-specific reading. Figures in a league scan can differ, because the scan is a faster comparative pass. The league-scan entry covers why, and which number to decide on.
Related articles
- What does the Sanity Score actually mean?
- The Relationship Between Market Odds and Fair Price
- Why do +EV numbers change between the league scan and the single-fixture view?
- Why does the same line move from -EV to +EV (or the other way) over time?
- Getting started: a simple strategy for your first weeks