Soccer Over/under 2.5 goals: devig calculator
- Market
- 2-way
- Typical overround
- 3%–7%
- Sample overround
- 3.91%
- Worst-case probabilities are per-outcome minimums and do not add up to 100%.
| Outcome | Multiplicative | Additive | Powerk = 1.059 | Shinz = 0.039 | Worst case |
|---|---|---|---|---|---|
| Outcome 1 | 50.65%1.974 | 50.67%1.973 | 50.69%1.973 | 50.67%1.973 | 50.65%1.974 |
| Outcome 2 | 49.35%2.026 | 49.33%2.027 | 49.31%2.028 | 49.33%2.027 | 49.31%2.028 |
- Overround
- 3.91%
- Margin
- 3.77%
- Outcomes
- 2
Overround 3.91%
Over/under 2.5 goals is a two-way market with no push: a half-goal line cannot land exactly. Different books may quote different lines (2.5 versus 3.0), and only prices on the same line form an arbitrage.
Overround in this market
Soccer Over/under 2.5 goals has 2 outcomes (
Over 2.5, Under 2.5). Bookmakers usually price it with an overround between 3% and 7%. Sharper books sit at the low end; recreational books and multi-way fields at the high end.
Worked example
Sample prices of 1.90 / 1.95 carry an overround of 3.91% (margin 3.77%). Multiplicative devigging gives fair probabilities of 50.6% / 49.4% and fair odds of 1.97 / 2.03. The calculator above starts from these prices and shows every method side by side.
| Outcome | Odds | Implied | Fair probability | Fair odds |
|---|---|---|---|---|
| Over 2.5 | 1.90 | 52.6% | 50.6% | 1.97 |
| Under 2.5 | 1.95 | 51.3% | 49.4% | 2.03 |
Method choice
In this 2-way market, with prices this close, the methods agree closely. Differences appear when one side is a heavy favourite; then the power and Shin columns are the ones to trust for the outsider's fair price.
Frequently asked questions
What is a normal overround for Soccer Over/under 2.5 goals?
Between 3% and 7% at most bookmakers. Lower means a sharper book; multi-way fields run higher.
Which devig method should I use for Soccer Over/under 2.5 goals?
With 2 outcomes priced close together the methods agree. When one outcome is a heavy favourite or the field is large, power or Shin better model where the margin sits; worst case gives the most conservative probability.
What are the fair odds for the sample prices?
The sample prices 1.90 / 1.95 carry an overround of 3.91%. Multiplicative devigging gives fair probabilities of 50.6% / 49.4% and fair odds of 1.97 / 2.03.
Can I use the fair probability to size a bet?
Yes: enter it with an offered price in the EV & Kelly calculator, or use the devig calculator's price-check panel, which reports edge and Kelly stake for each method.