Odds to Probability Table: Probability by Odds for (favourable)
Reference table of probability for Odds to Probability across a range of odds for (favourable) values — exact, engine-computed figures you can read off at a glance.
Odds to Probability Calculator
Verified formula Updated Jun 2026 Private — runs on your device
Verified formula
Private
Probability
20.00%
For general information only — not financial, tax, legal or medical advice. Verify before you rely on it.
How to use the Odds to Probability Calculator
The Odds to Probability Calculator works out your probability in an instant. Enter odds for (favourable) and odds against and the result updates as you type — it is free, needs no sign-up, and runs entirely in your browser so your figures stay private.
- Enter the odds for (favourable).
- Enter the odds against.
- Read off your probability — the calculator updates automatically, with no button to press.
Formula
The Odds to Probability Calculator uses the formula:
Probability = Odds for (favourable) ÷ (Odds for (favourable) + Odds against) × 100
Worked example
For example, with odds for (favourable) of 1 and odds against of 4, the probability is 20.00%.
| Odds for (favourable) | 1 |
|---|---|
| Odds against | 4 |
| Probability | 20.00% |
|---|
Results are estimates for educational use, not professional advice.
Key terms explained
- Probability
- The likelihood of an event, from 0 (impossible) to 1 (certain), often shown as a percentage.
Frequently asked questions
Divide the favourable odds by the total of favourable plus against. Odds of 1 to 4 give a probability of 1 ÷ 5 = 20%.
Odds compare favourable to unfavourable outcomes, while probability compares favourable outcomes to all outcomes.
Odds of 2 to 1 in favour mean a probability of 2 ÷ 3, about 66.7%. Against, they mean 1 ÷ 3, about 33.3%.
Odds are common in betting and gaming. Converting them to a probability makes the real chance easier to understand.
The Odds to Probability Calculator uses the formula: Probability = Odds for (favourable) ÷ (Odds for (favourable) + Odds against) × 100. For example, with odds for (favourable) of 1 and odds against of 4, the probability is 20.00%.
Enter the odds for (favourable). Enter the odds against. Read off your probability — the calculator updates automatically, with no button to press.
Related guides
How to Calculate Odds to Probability: Formula, Steps & Examples
Learn how to calculate Odds to Probability — the formula explained step by step, with worked examples and a free calculator to check your answer.