Betting Odds Converter

An odds converter translates betting odds from one format to another — American (moneyline), decimal, and fractional — so you can compare odds across different sportsbooks regardless of the format they use. It also calculates the implied probability and potential payout for your wager.

For positive American odds (e.g. +200): decimal = (American / 100) + 1. For negative American odds (e.g. -110): decimal = (100 / |American|) + 1. So -110 American equals 1.9091 decimal, and +200 equals 3.00 decimal.

First convert American to decimal, then subtract 1 to get the fractional value as a ratio. For example, +200 American = 3.00 decimal = 2/1 fractional. Negative odds like -110 = 1.9091 decimal ≈ 10/11 fractional.

Divide the numerator by the denominator, then add 1. For example, 5/2 fractional = (5 ÷ 2) + 1 = 3.50 decimal. This represents your total return per unit staked, including your original stake.

If decimal odds are 2.00 or higher: American = (decimal - 1) × 100 (positive). If decimal odds are below 2.00: American = -100 ÷ (decimal - 1) (negative). For example, 1.9091 decimal = -110 American, and 3.00 decimal = +200 American.

Implied probability tells you the likelihood of an outcome as implied by the odds. For decimal odds: probability = 1 / decimal × 100. For American positive odds: probability = 100 / (American + 100) × 100. For American negative odds: probability = |American| / (|American| + 100) × 100.

Payout is the total amount returned to you if your bet wins, including your original stake. Profit (or 'to win') is just the winnings on top of your stake. For example, a $100 bet at -110 returns a $190.91 payout, but the profit is $90.91.

American odds are standard in the US, fractional odds are traditional in the UK and Ireland, and decimal odds are used across Europe, Australia, and Canada. Each format conveys the same information — just presented differently. Decimal odds are generally considered the easiest to use for calculating payouts quickly.