Calculators / Overround / hold
Overround / hold calculator
Add every price in a market and see the bookmaker's margin two ways: the raw overround, and the "hold" — the share of every dollar staked the book expects to keep.
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| Selection | Odds | Implied |
|---|
Overround
Hold (margin on every $1 staked)
How it works
Overround is the sum of every side’s implied probability. A fair, two-way coin-flip market prices each side at exactly 50%, summing to 100%. Real books price every side a little short, so the sum runs over 100%. That excess is the overround.
Hold converts that into what actually matters financially: 1 − (1 ÷ overround). It is the bookmaker’s expected take from total stakes if money were bet on every side in proportion to its own implied probability. This gives you a cleaner number than the overround percentage for comparing the true cost of one market against another.
Worked example
A three-way soccer market.
| Home 2.30 | 43.5% |
| Draw 3.20 | 31.3% |
| Away 3.60 | 27.8% |
| Overround | 102.5% |
| Hold | 2.4% |
Want each side's true, vig-free probability instead of just the margin? Use the Implied probability calculator.