Convert favorable outcomes and total outcomes into a probability, percentage and odds.
Convert favorable outcomes and total outcomes into a probability, percentage and odds.
Enter values above and click Calculate — results will appear here with the formula explained.
Classical probability assumes every outcome is equally likely. Count how many outcomes match your event, divide by how many outcomes exist in total, and the result lies between 0 (impossible) and 1 (certain).
Probabilities of complementary events always sum to exactly 1, so the chance something does not happen is one minus the chance it does. Odds restate the same idea as a ratio of success to failure rather than a fraction of the whole.
Advertisement
AdSense ready — add NEXT_PUBLIC_GOOGLE_ADSENSE_PUBLISHER_ID
Classical probability assumes every outcome is equally likely. Count how many outcomes match your event, divide by how many outcomes exist in total, and the result lies between 0 (impossible) and 1 (certain). Formula: P(event) = favorable outcomes ÷ total outcomes; P(not event) = 1 − P(event)
Probability Calculator computes convert favorable outcomes and total outcomes into a probability, percentage and odds. Formula: P(event) = favorable outcomes ÷ total outcomes. Example: Drawing an ace from a standard 52-card deck has 13 favorable outcomes if we count all spades: P = 13/52 = 1/4 = 25%.
Convert favorable outcomes and total outcomes into a probability, percentage and odds. Formula: P(event) = favorable outcomes ÷ total outcomes; P(not event) = 1 − P(event)
| Field | What to enter |
|---|---|
| Favorable outcomes | e.g. 13 |
| Total possible outcomes | e.g. 52 |
All fields use the exact formulas shown below — results include step-by-step breakdowns you can verify by hand.
Classical probability assumes every outcome is equally likely. Count how many outcomes match your event, divide by how many outcomes exist in total, and the result lies between 0 (impossible) and 1 (certain).
Probabilities of complementary events always sum to exactly 1, so the chance something does not happen is one minus the chance it does. Odds restate the same idea as a ratio of success to failure rather than a fraction of the whole.
Advertisement
AdSense ready — add NEXT_PUBLIC_GOOGLE_ADSENSE_PUBLISHER_ID
Drawing an ace from a standard 52-card deck has 13 favorable outcomes if we count all spades: P = 13/52 = 1/4 = 25%. The complement — not drawing a spade — is 75%, with odds 13:39, which simplifies to 1:3.
Advertisement
AdSense ready — add NEXT_PUBLIC_GOOGLE_ADSENSE_PUBLISHER_ID