Calculators / Hold calculator
Hold calculator
How much a market charges, as the share of bets the book keeps.
Enter the prices for both sides.
How it works
Hold is 1 - 1 / (sum of implied probabilities). A standard -110 / -110 market holds 4.55%: on $100 bet across both sides, the book keeps about $4.55.
Overround is the same margin counted the other way: the implied probabilities minus 100% (4.76% for -110 / -110).
Lower hold means fairer prices. Sharp books hold 2 to 3% on main lines; props and parlays often hold far more.