# Odds Converter and Probability Calculator

A quick, simple tool to convert fractional, decimal and American odds. Converts odds from fractional to decimal and also calculates your win/lose probability when entering back and lay odds. Can be used for bookmakers that don't offer a change in odds preference / any offer.

**To convert decimal odds to fractional**, subtract 1.00 and then find the nearest whole integer (so for example 3.75 - 1.00 becomes 2.75/1, or 11/4).

**To convert US odds to decimal**, if the US odds are positive, divide by 100 and add 1. If it is negative, divide 100 by the US odds (without the minus sign) and add 1.

**To convert fractional odds to decimal**, divide the first figure by the second figure add 1.00 (so 11/4 = 2.75, then add 1.00 = 3.75).