Free betting calculator
Odds converter
Type a price in any box and every other format updates as you type, with the implied probability and what a stake would pay. Works for American, decimal, fractional and the three Asian formats.
Enter odds in any box
Formats: American +150 or -120 · decimal 2.50 (a comma works too: 2,50) · fractional 3/2, 5-2 or evens · Hong Kong 1.50 · Indonesian 1.50 or -2.00 · Malay 0.67 or -0.50.
Show the calculation
- American +150: 1 + 150 ÷ 100 = 2.5 decimal
- American = (2.5 minus 1) × 100 = +150
- Fractional = 2.5 minus 1, as a fraction = 3/2
- Implied probability = 1 ÷ 2.5 = 40.00%
- Total return = $100.00 × 2.5 = $250.00; profit = return minus stake = $150.00
Calculations show hypothetical outcomes from the prices you enter. They do not predict results, and betting always involves risk.
How each odds format works
American odds are quoted around 100. A plus number is the profit on a $100 stake (+150 wins $150); a minus number is what you stake to win $100 (-120 means $120 to win $100). Decimal odds are the total return per 1 staked, stake included (2.50 returns $2.50 for each $1). Fractional odds are profit over stake (3/2 wins $3 for every $2).
Every format describes the same price, so the converter turns each into decimal odds first and shows the rest from there. The implied probability is 1 divided by the decimal odds.
Common prices in every format
| American | Decimal | Fractional | Implied probability | Profit on $100 |
|---|---|---|---|---|
| -500 | 1.20 | 1/5 | 83.3% | $20.00 |
| -300 | 1.333 | 1/3 | 75.0% | $33.33 |
| -200 | 1.50 | 1/2 | 66.7% | $50.00 |
| -150 | 1.667 | 2/3 | 60.0% | $66.67 |
| -120 | 1.833 | 5/6 | 54.5% | $83.33 |
| -110 | 1.909 | 10/11 | 52.4% | $90.91 |
| +100 | 2.00 | 1/1 | 50.0% | $100.00 |
| +120 | 2.20 | 6/5 | 45.5% | $120.00 |
| +150 | 2.50 | 3/2 | 40.0% | $150.00 |
| +200 | 3.00 | 2/1 | 33.3% | $200.00 |
| +300 | 4.00 | 3/1 | 25.0% | $300.00 |
| +500 | 6.00 | 5/1 | 16.7% | $500.00 |
| +1000 | 11.00 | 10/1 | 9.1% | $1000.00 |
The formulas
- American plus to decimal: 1 + odds / 100
- American minus to decimal: 1 + 100 / |odds|
- Decimal to American: (decimal minus 1) x 100 when decimal is 2.00 or more, otherwise -100 / (decimal minus 1)
- Fractional to decimal: 1 + numerator / denominator
- Implied probability: 1 / decimal
Worked example
Start from -120. It is a minus price, so decimal odds are 1 + 100 / 120 = 1.833. In American terms that is -120, and as a fraction 5/6 (profit 5 for every 6 staked). The implied probability is 1 / 1.833 = 54.55%, and a $60 stake returns $110.00: $60 back plus $50.00 profit.
What the converter can't tell you
Converting changes how a price is written, not what it is worth. The implied probability still includes the sportsbook's margin; to remove it, enter every side of the market in the no vig calculator. American odds are shown as whole numbers and fractions as the nearest simple fraction (marked ≈), so a few prices round: 1.95 shows as -105, and 1.909 as 10/11.
Related guides
Common questions
How do I convert American odds to decimal?
For plus odds, divide by 100 and add 1: +150 becomes 2.50. For minus odds, divide 100 by the number (without the minus) and add 1: -120 becomes 1.833. Decimal odds always include your stake.
What does -110 mean?
You stake $110 to win $100, so $210 back in total. As decimal odds that is 1.909, as a fraction about 10/11, and it implies a 52.4% chance of winning.
What are evens?
Evens (or even money) means you win the same amount you stake: +100 in American odds, 2.00 in decimal and 1/1 as a fraction. It implies a 50% chance.
Why does the fractional box sometimes show ≈?
Not every price has a tidy fraction. -110 is exactly 1.909 in decimal, which is 10/11 rounded; the converter shows the nearest simple fraction with a denominator up to 100 and marks it as approximate.
What are Hong Kong, Indonesian and Malay odds?
Asian formats quote profit per 1 staked. Hong Kong odds are decimal odds minus 1. Indonesian odds match American odds divided by 100 (-2.00 means stake 2 to win 1). Malay odds run from -1 to 1: positive below evens, negative above it.
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