Convert American, Decimal and Fractional Odds Instantly.
Calculate Potential Payouts, Profit and Implied Probability.
e.g. +150 or −110
Your original bet · amounts in CAD
Includes your original stake
Winnings excluding your stake
This is the break-even probability implied by the listed odds, before accounting for the sportsbook's margin.
Displayed values are rounded. Fractional approximations are marked ≈. Precision policy
Turn your estimated chance into a break-even price.
Greater than 0% and less than 100%.
Based on your estimate, not a verified prediction. Example: a 40% estimate implies fair decimal odds of 2.50.
e.g. +150 or −110
From 0% through 100%, inclusive.
e.g. 1000.00 without a thousands separator.
EV = probability × profit if win − (1 − probability) × stake. Results depend on your estimate and describe a theoretical average, not a guaranteed outcome.
e.g. +150 or −110
e.g. −110 or +150
Enter valid prices and confirm the market relationship to show results.
“Overround” here means the total implied percentage; margin is the excess above 100%. Some sources call the excess itself overround. Proportional normalization estimates no-vig probabilities; prices alone cannot reveal actual fair probabilities or realized bookmaker profit.
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If successful, this bet returns $250 in total: your original $100 plus $150 profit. The listed price implies a 40% break-even probability.
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| Odds | Net profit | Total payout | Implied probability |
|---|---|---|---|
| +150 | $150.00 | $250.00 | 40.00% |
| −200 | $50.00 | $150.00 | 66.67% |
| −110 | $90.91 | $190.91 | 52.38% |
| 2.50 decimal | $150.00 | $250.00 | 40.00% |
| 3/2 fractional | $150.00 | $250.00 | 40.00% |
Practical guides to the maths behind the market.
Understand positive and negative prices, favourites and even money.
Explore guide →One multiplier for the full return. Learn to separate stake from profit.
Explore guide →Read the ratio, reduce the fraction and understand approximations.
Explore guide →Turn a price into a break-even chance, with its limits in view.
Explore guide →A practical walkthrough of payouts, expected value and margin.
Explore guide →Odds describe the return offered for a successful bet. American, decimal and fractional formats express the same relationship in different ways. At +150, 2.50 or 3/2, a $100 winning stake earns $150 profit.
Total payout includes your original stake. Profit is what remains after subtracting it. Multiply stake by decimal odds for payout, or by decimal odds minus one for profit.
For opposing outcomes, add the raw implied probabilities. Two prices of −110 sum to about 104.76%, an excess of 4.76 percentage points above 100%. That excess is a quoted market margin, not a guaranteed realized profit for the sportsbook.
Implied probability is 100 divided by decimal odds. It tells you the break-even success rate at a price. It does not verify an event’s actual likelihood, and bookmaker prices include margin. A lower price is no guarantee of a win.
Quick answers to the things
people want to know.
Convert the price to decimal odds. Multiply decimal odds by stake for total payout, subtract the stake for profit, and divide 100 by decimal odds for implied probability.
For positive odds, use 1 + odds ÷ 100. For negative odds, use 1 + 100 ÷ the absolute odds. For example, +150 becomes 2.50 and −200 becomes 1.50.
A successful $100 stake earns $150 profit, returning $250 including the original stake. It is equivalent to decimal 2.50 and fractional 3/2.
You need to stake $110 to earn $100 profit on a win. A $100 stake earns about $90.91 profit and returns $190.91. The implied probability is about 52.38%.
If winnings means profit, multiply stake by (decimal odds − 1). Total payout also includes your original stake. At 2.50 with $100, profit is $150 and payout is $250.
It is the break-even success rate implied by a price: 100 ÷ decimal odds. It includes the effect of the quoted price and is not a verified prediction.
They can describe the same return. Add 1 to the fractional ratio to get decimal odds: 3/2 + 1 = 2.50. Rounded conversions may only be approximate.
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