Calculators
Odds calculator: convert American, decimal, fractional, %
Type a price in any format: American, decimal, fractional or percentage. The odds calculator shows the other three formats, the implied probability and the payout of your stake in CAD.
40.0% implied chanceabout 40 in 100
A $10.00 bet at 2.50 (+150) returns $25.00 if it wins: your $10.00 back plus $15.00 profit. The 40.0% chance comes from the price, so it still includes the bookmaker’s margin.
How it is calculated
You typed american +150 → decimal1 + 150 ÷ 100 = 2.50
Decimal → American+100 × (2.50 − 1) = +150
Fractional = profit per 1 staked2.50 − 1 = 3/2
Implied chance1 ÷ 2.50 = 40.00%
Total return = stake × decimal odds$10.00 × 2.50 = $25.00
One price, four formats
| Price | American | Decimal | Fractional | Implied chance |
|---|---|---|---|---|
| Underdog | +150 | 2.50 | 3/2 | 40.0% |
| Even money | +100 | 2.00 | evens | 50.0% |
| Favourite | −200 | 1.50 | 1/2 | 66.7% |
A $10.00 bet at +150 returns $25.00. At −200 it returns $15.00. Both amounts include the stake.
American odds to decimal
Plus price: 1 + odds ÷ 100. Minus price: 1 + 100 ÷ odds (ignore the minus sign).
Example: +150: 1 + 150 ÷ 100 = 2.50. −200: 1 + 100 ÷ 200 = 1.50.
Decimal odds to implied chance
Implied chance = 1 ÷ decimal odds. Multiply by 100 for a percentage.
Example: +150 is 2.50: 1 ÷ 2.50 = 40.0%. −110 is 1.91: 1 ÷ 1.91 = 52.4%.
Plus odds vs minus odds
Plus (+): underdog
- Shows the profit on a $100 stake
- +300 profits $300.00 on $100
- Decimal odds above 2.00
- Implied chance below 50.0%
Minus (−): favourite
- Shows the stake needed to profit $100
- −110: risk $110.00 to profit $100
- Decimal odds below 2.00
- Implied chance above 50.0%
- Same price on both sides: neither is the favourite
Terms on this page
- Implied chance
- The probability a price suggests, margin included. Same as implied probability.
- Evens
- Even money: +100 = 2.00. Profit equals the stake. More in how betting odds work.
- Favourite
- The side the price rates more likely: minus American odds, decimal below 2.00. When both sides have the same price, neither is the favourite.
- Underdog
- The side the price rates less likely. Plus American odds, decimal above 2.00.
- American odds
- Prices with + or −, based on $100. All common prices are in the printable odds chart.
Questions
How do I convert American odds to decimal?
For a plus price, divide by 100 and add 1: +150 becomes 2.50. For a minus price, divide 100 by the number and add 1: −200 becomes 1.50.
How do I convert decimal odds to American?
At 2.00 or above: (decimal − 1) × 100, with a plus sign. Below that: 100 ÷ (decimal − 1), with a minus sign. For example, 1.50 becomes −200.
How do I convert odds to a percentage?
Convert the price to decimal, then divide 1 by it. −110 is 1.91, so the implied probability is 52.4%. This number includes the bookmaker's margin.
What do minus odds mean?
The stake needed for $100 profit. At −110 you risk $110.00 to profit $100. A $10.00 bet returns $19.09, stake included.
How do fractional odds compare to decimal odds?
Fractional odds show the profit per unit staked. Decimal odds add the stake back: decimal = fraction + 1. For example, 3/2 equals 2.50.