Statistics & Probability

Instant, private, and free

Decimal Odds Calculator.

Convert an implied probability to decimal odds.

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Set your values

Results update as you type.

Decimal odds: 2.5

Decimal odds

2.500000
Net payout per unit: 1.5

Net payout per unit

1.500000
Implied probability: 0.4

Implied probability

0.400000

Results update automatically as you type.

Use Cases

Convert probability to betting odds

If you have a probability estimate for an event, this calculator converts it to decimal odds, helping you compare with bookmaker odds.

Example: If you estimate a 25% chance, the decimal odds are 4.00.

Check fair odds for a bet

Determine the fair decimal odds for a given probability to assess if a bet offers value.

Example: A 20% probability implies fair odds of 5.00.

Frequently Asked Questions

What are decimal odds?
Decimal odds represent the total payout per unit staked, including your original stake. For example, odds of 2.50 mean you receive $2.50 for every $1 bet, including your $1 back.
How do I use this calculator?
Enter the implied probability as a percentage (e.g., 40 for 40%). The calculator instantly computes the corresponding decimal odds using the formula: decimal odds = 100 / implied probability.
What is implied probability?
Implied probability is the likelihood of an outcome as derived from odds. It is expressed as a percentage. For decimal odds, it is calculated as 100 divided by the decimal odds.

Tips & Common Mistakes

Tips

  • Enter the implied probability as a number between 0 and 100. For example, 50 means 50%.
  • The calculator updates instantly as you type, so you can see results without pressing a button.
  • Decimal odds are commonly used in Europe, Australia, and Canada. They are also called European odds.
  • Remember that decimal odds include your stake, so the profit is odds minus 1.

Common Mistakes to Avoid

  • Entering the probability as a decimal (e.g., 0.5 instead of 50). The calculator expects a percentage.
  • Confusing decimal odds with fractional or American odds. This calculator only works with decimal odds.
  • Forgetting that a probability of 100% would give odds of 1.00, which is not a valid betting scenario.

Last updated: August 13, 2026