Odds Converter — Every Format, Instantly
Enter odds in any format and see the conversion across decimal, fractional, American, Hong Kong, Indonesian, and Malaysian — plus implied probability, profit, and total return.
How Odds Formats Work
Odds exist in six major formats worldwide, each showing the same information in a different way. Understanding all of them lets you compare prices across international bookmakers and spot value that others miss.
📊 Decimal Odds (Europe, Australia, Canada)
Decimal odds show your total return per unit staked, including your original stake. For example, odds of 2.50 mean a £1 bet returns £2.50 (your £1 stake plus £1.50 profit). Decimal odds are the simplest format for comparing prices across bookmakers — higher decimal odds always mean a better return.
🇬🇧 Fractional Odds (UK & Ireland)
Fractional odds show your profit relative to your stake. Odds of 3/2 ("three to two") mean you profit £3 for every £2 staked. Your total return is £5 (stake + profit). Fractional odds are traditional in horse racing and UK sports but are harder to work with when comparing prices.
🇺🇸 American Odds (United States)
American odds use positive and negative numbers based on a £100 baseline. Positive odds (+150) show how much profit you make on a £100 bet. Negative odds (-167) show how much you need to stake to profit £100. They're the standard format on US sportsbooks.
🇭🇰 Hong Kong Odds (Asia)
Hong Kong odds show profit per unit staked — they are decimal odds minus 1. For example, decimal odds of 2.50 become Hong Kong odds of 1.50. They're popular in Asian markets and make it easy to see your profit at a glance. To convert back, simply add 1.
🇮🇩 Indonesian Odds (Southeast Asia)
Indonesian odds work like American odds divided by 100. Positive Indonesian odds (+1.50) mean you profit 1.50 units per unit staked. Negative Indonesian odds (−1.67) mean you need to stake 1.67 units to profit 1 unit. They're functionally identical to American odds, just expressed differently.
🇲🇾 Malaysian Odds (Malaysia)
Malaysian odds are inverse Indonesian odds. When the odds are positive (0.50), you profit that amount per unit staked. When negative (−0.60), you need to stake that absolute amount to profit 1 unit. Malaysian odds are the opposite of Indonesian odds for underdogs vs. favorites.
Odds Conversion Reference Table
Common odds and their equivalents across all six formats, plus implied probability. Use this as a quick reference when comparing prices across international bookmakers.
| Decimal | Fractional | American | HK | Indonesian | Malaysian | Implied Prob |
|---|---|---|---|---|---|---|
| 1.25 | 1/4 | −400 | 0.25 | −4.00 | 0.25 | 80.0% |
| 1.50 | 1/2 | −200 | 0.50 | −2.00 | 0.50 | 66.7% |
| 1.80 | 4/5 | −125 | 0.80 | −1.25 | 0.80 | 55.6% |
| 2.00 | Evens (1/1) | +100 | 1.00 | 1.00 | 1.00 | 50.0% |
| 2.50 | 3/2 | +150 | 1.50 | 1.50 | −0.67 | 40.0% |
| 3.00 | 2/1 | +200 | 2.00 | 2.00 | −0.50 | 33.3% |
| 4.00 | 3/1 | +300 | 3.00 | 3.00 | −0.33 | 25.0% |
| 5.00 | 4/1 | +400 | 4.00 | 4.00 | −0.25 | 20.0% |
| 10.00 | 9/1 | +900 | 9.00 | 9.00 | −0.11 | 10.0% |
Worked Examples
Example 1: Converting Decimal 2.50
Decimal odds of 2.50 represent a 40% implied probability (1 ÷ 2.50 = 0.40).
- Fractional: (2.50 − 1) = 1.50 = 3/2
- American: Since odds > 2.00, American = (2.50 − 1) × 100 = +150
- Hong Kong: 2.50 − 1 = 1.50
- Indonesian: +150 ÷ 100 = +1.50
- Malaysian: −1 ÷ 1.50 = −0.67
- Profit on £10: £10 × 1.50 = £15 profit, £25 total return
Example 2: Converting American −200
American odds of −200 represent a 66.7% implied probability (200 ÷ (200 + 100) = 0.667).
- Decimal: (200 ÷ 100) + 1 = 1.50
- Fractional: (1.50 − 1) = 0.50 = 1/2
- Hong Kong: 1.50 − 1 = 0.50
- Indonesian: −200 ÷ 100 = −2.00
- Malaysian: 1 ÷ 2.00 = 0.50
- Profit on £10: £10 × 0.50 = £5 profit, £15 total return
Example 3: Spotting Value with Implied Probability
Bookmaker A offers 2.10 (decimal) on Team X winning. That implies a probability of 47.6% (1 ÷ 2.10).
If your own analysis says Team X has a 55% chance of winning, the bet has positive expected value because your estimated probability (55%) exceeds the implied probability (47.6%). This means the odds are higher than they should be — and you have a value bet.
Use our Implied Probability Calculator to check multiple outcomes at once, or the Overround Calculator to see the bookmaker's total margin.
Conversion Formulas
For reference, here are the exact formulas used by this converter. All conversions go through decimal odds as the intermediate format because the math is simplest that way.
| From | To Decimal | Notes |
|---|---|---|
| Fractional (a/b) | a ÷ b + 1 | Add 1 to the fraction |
| American (+X) | X ÷ 100 + 1 | For underdogs (odds > +100) |
| American (−X) | 100 ÷ X + 1 | For favourites (absolute value) |
| Hong Kong (hk) | hk + 1 | Simply add 1 |
| Indonesian (+indo) | indo + 1 | Same as HK for positive |
| Indonesian (−indo) | 1 + 1 ÷ |indo| | Invert and add 1 |
| Malaysian (+my) | my + 1 | Same as HK for positive |
| Malaysian (−my) | 1 + 1 ÷ |my| | Invert and add 1 |
Why Understanding Odds Formats Matters
If you only bet with one bookmaker in one region, you might never need to convert odds. But serious bettors who want to maximize their returns should understand all formats for three key reasons:
1. Cross-Market Arbitrage
Different bookmakers around the world set odds in different formats. A European bookmaker might price a football match at 1.80 (decimal), while an Asian exchange shows 0.80 (Hong Kong), and a US sportsbook shows −125 (American). They all mean the same thing, but you can only spot arbitrage opportunities if you can compare like with like. Our Dutching Calculator uses decimal odds to help you split stakes across outcomes.
2. Better Value Detection
Converting odds to implied probability is the first step in finding value bets. When two bookmakers price the same event at different implied probabilities, the one offering lower implied probability (higher odds) is giving you better value. This is the foundation of value betting — our guide shows you exactly how to find and exploit these gaps.
3. Understanding Bookmaker Margins
When you add up the implied probabilities for all outcomes in a market, the total exceeds 100%. That excess is the bookmaker's margin (overround). Converting to implied probability makes this visible. A market priced at 104% total has a 4% overround — meaning the bookmaker takes 4% on every bet regardless of the result. Use our Overround Calculator to measure exact margins.
💡 Pro Tip: Always Convert to Decimal
For serious betting analysis, always convert to decimal odds first. Decimal odds make calculations simpler (multiply stake by odds for returns), comparisons clearer (higher number = better price), and they're the input format for arbitrage calculators, dutching tools, and value betting models.
Common Odds Conversion Mistakes
⚠️ Mistake 1: Confusing Profit with Return
The most common error is mixing up profit and total return. Decimal odds give you total return (stake + profit). Fractional odds give you profit only. A £10 bet at 2.50 (decimal) returns £25 total — not £25 profit. Your profit is £15. Always check which format you're reading before calculating.
⚠️ Mistake 2: Forgetting Even-Money Conversion
Odds of exactly 2.00 (decimal) = Evens (1/1 fractional) = +100 (American). This is the break-even point where implied probability is exactly 50%. Many conversions fail because people try to simplify "even money" as something more complex than it is.
⚠️ Mistake 3: Ignoring the Favourite-Underdog Flip
American, Indonesian, and Malaysian odds all switch behaviour at even money (+100 American / 1.00 HK / 2.00 decimal). Above even money, positive American odds apply. Below even money, negative American odds apply. The converter automatically handles this switch, but it catches many manual calculations out.