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Decimal Odds Explained
Decimal odds show the total return for every ₹1 staked, including the stake itself. They are widely used in international sports markets because the arithmetic is simple: multiply the stake by the odds and you have the full return.
- 1.50: every ₹1 returns ₹1.50, so the profit is 50 paise.
- 2.00: every ₹1 returns ₹2, which doubles the stake and is often called "evens".
- 3.50: every ₹1 returns ₹3.50, a profit of ₹2.50.
The lower the number, the more likely the market thinks the outcome is. Decimal odds are always above 1.00, because 1.00 would only return the stake.
Implied Probability = 1 ÷ Decimal Odds = 1 ÷ 2.50 = 0.40 = 40%
To turn decimal odds into a percentage quickly, divide 100 by the odds: 100 ÷ 2.50 = 40%.
Fractional Odds Explained
Fractional odds come from the British tradition and are still common in horse racing. They show the profit relative to the stake, not the total return. Read 5/2 as "five to two": for every ₹2 staked, the profit is ₹5, and the stake comes back on top.
- Odds-against (first number bigger, such as 5/2): the profit is larger than the stake, so the market sees the outcome as less likely than not.
- Evens (1/1): the profit equals the stake, which implies a 50% chance.
- Odds-on (first number smaller, such as 1/2): the profit is smaller than the stake, so the market sees the outcome as more likely than not.
Profit = Stake × Fractional Odds = ₹100 × 5/2 = ₹250
A common beginner error is reading 5/2 as a ₹250 total return on ₹100; ₹250 is the profit, and the total return is ₹350.
How to Calculate Payouts
Every payout calculation needs three inputs: the stake, the odds and the format. Always work out the total return and the profit separately.
- Write down the stake, for example a hypothetical ₹100.
- For decimal odds, multiply the stake by the odds to get the total return.
- For fractional odds, multiply the stake by the fraction to get the profit.
- Add or subtract the stake so you have both figures.
Decimal: Total Return = ₹100 × 3.50 = ₹350, so Profit = ₹350 − ₹100 = ₹250
Fractional: Profit = ₹100 × 5/2 = ₹250, so Total Return = ₹250 + ₹100 = ₹350
Odds-on: Profit = ₹100 × 1/2 = ₹50, so Total Return = ₹150 (decimal 1.50)
The first two lines describe the same price: decimal 3.50 and fractional 5/2 are one number written two ways.
Converting Odds Between Formats
Conversion rests on one rule: decimal odds equal fractional odds plus 1. The extra 1 is the returned stake, which decimal odds include and fractional odds leave out.
Fractional to Decimal: 5/2 + 1 = 2.50 + 1 = 3.50
Decimal to Fractional: 2.75 − 1 = 1.75 = 7/4
To go from decimal to fractional, subtract 1 and simplify: 1.40 − 1 = 0.40, which is 2/5. The table shows common prices side by side for a hypothetical ₹100 stake.
| Fractional | Decimal | Implied Probability | Total Return on ₹100 |
|---|---|---|---|
| 1/2 | 1.50 | 66.67% | ₹150 |
| 4/5 | 1.80 | 55.56% | ₹180 |
| 1/1 (evens) | 2.00 | 50.00% | ₹200 |
| 6/4 | 2.50 | 40.00% | ₹250 |
| 5/2 | 3.50 | 28.57% | ₹350 |
| 4/1 | 5.00 | 20.00% | ₹500 |
Memorize three anchor points (2.00 is 50%, 3.00 is about 33% and 5.00 is 20%) and you can estimate most prices in your head.
Why Implied Probability Matters
Converting odds into percentages lets you compare prices on equal terms. If the implied probabilities of every outcome add up to more than 100%, the excess is the built-in margin, often called the overround. Take a hypothetical two-way market priced at 1.90 on each side.
Margin Check = (1 ÷ 1.90) + (1 ÷ 1.90) = 52.63% + 52.63% = 105.26%
Those extra 5.26 percentage points make both prices less generous than a fair 50/50. Spotting that margin is the first step toward reading odds critically rather than emotionally.