Bookmaker margin (overround) calculator

Calculate the margin baked into a bookmaker's prices. Lower margin = sharper book.

Sharp book
Sum of inverses0.9890
Margin (overround)-1.10%
Effective payout per €1€1.0111

How it works

Margin = (sum of inverse odds − 1) × 100. Pinnacle: ~2-3%. Soft books: 5-10%. Player props can hit 15%+.

Step by step

  1. Enter the bookmaker's odds, For all outcomes.
  2. Calculate, See margin and effective bookmaker payout.

FAQ

What is a low margin?

Below 4% is sharp. 5-7% is competitive. Above 8% is soft.