Coin Flip Streak Calculator
Probability of getting a streak of heads (or tails) of a given length in a number of coin flips.
Compare Your Options And Get Clear Answers
Probability of getting a streak of heads (or tails) of a given length in a number of coin flips.
Coin Flip Streak Estimator
Enter your numbers below for an instant estimate.
How It Works
Key concepts behind this calculator
Enter Values
Fill in each field with your own numbers.
Calculate
Results update as you change the inputs.
Review
Read the breakdown and the explanation.
Adjust
Change values to compare scenarios.
Coin Quick Guide
Typical values for reference.
| Flips | Streak | p(heads) | Chance |
|---|---|---|---|
| 20 | 4 | 0.5 | 47.80% |
| 50 | 5 | 0.5 | 55.19% |
| 100 | 6 | 0.5 | 54.61% |
| 200 | 8 | 0.5 | 31.97% |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Coin Flip Streak Calculator FAQ
Answers to common questions about this calculator.
Yes. In 100 flips, a run of 6 heads or tails is likely.
No, flips are independent.
Dynamic programming over sequences with no run of k heads.
It is an estimate based on the inputs you enter. Check real quotes, labels or official guidance for important decisions.