The Lab / Odds Converter

Odds Converter

Convert between Decimal, Fractional & American odds

Implied Probability —

Odds Formats Explained

Australian bookmakers use decimal odds (e.g. 2.50), which represent your total return per dollar staked including your original stake. UK bookmakers traditionally use fractional odds (e.g. 3/2), which represent only your profit relative to your stake. American sportsbooks use moneyline odds (e.g. +150 or −200), where positive numbers show profit on a $100 stake and negative numbers show how much you must stake to win $100.

Why Implied Probability Matters

Every set of odds implies a probability. Decimal odds of 2.00 imply a 50% chance. Odds of 1.50 imply 66.7%. Understanding implied probability is the foundation of finding value — if you believe a team has a 60% chance of winning but the odds imply only 50%, you have an edge worth exploiting.

Quick Reference

Decimal 2.00 = Fractional 1/1 (Evens) = American +100. Decimal 1.50 = Fractional 1/2 = American −200. Decimal 3.00 = Fractional 2/1 = American +200.

Frequently Asked Questions

How do decimal odds work?
Decimal odds show your total return per $1 staked. Odds of 2.50 mean a $10 bet returns $25 total ($15 profit + $10 stake). To calculate profit, multiply your stake by the odds and subtract your stake.
How do I convert American odds to decimal?
For positive American odds: divide by 100 and add 1 (e.g. +150 = 2.50). For negative American odds: divide 100 by the number and add 1 (e.g. −200 = 1.50).
What is implied probability?
Implied probability is the chance of an outcome happening as suggested by the odds. Calculate it as: 1 / decimal odds × 100. For odds of 2.00, the implied probability is 50%.

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