Coin flip online
Press Flip: the coin lands on heads or tails, with exactly a one-in-two chance. Getting heads 3 times in a row only happens 1 time in 8.
- Checked on thousands of cases
- Sources: W3C
- Updated November 6, 2026
Result
Press Flip.
Drawn at random on your device; nothing is saved.
Quick challenge
Streak 0Best 0
Test yourself: every answer is computed by the tool, and the wrong choices are the most common traps.
How it works
Formula: Chance of k heads in a row = (1/2)ᵏ
Each flip uses the browser's secure random generator (crypto.getRandomValues), the same one used for passwords. The tool discards the rare values that would tip the balance, so heads and tails have exactly the same chance. Flips are independent: the coin has no memory of earlier results. Nothing is sent or saved.
Worked examples
3 heads in a row
1 chance in 8, or 12.5%.
Exactly 5 heads in 10 flips
Only 24.6%: 252 ways out of 1,024.
2 coins: one heads and one tails
50%: 2 cases out of 4 (heads-tails and tails-heads).
Common mistakes
Thinking tails is due after 5 heads in a row.
Each flip is independent: 50% every time.
Expecting 10 flips to always give 5 heads and 5 tails.
Exactly 5 and 5 happens only 24.6% of the time.
Adding chances: 3 heads in a row = 3 × 50%.
Multiply them: ½ × ½ × ½ = 1 chance in 8.
What the calculation leaves out
- The draw happens on your device and is not recorded: it does not replace an official draw in front of witnesses.
Chance of heads on every flip
| Flips in a row | Chance |
|---|---|
| 1 | 1 in 2 (50 %) |
| 2 | 1 in 4 (25 %) |
| 3 | 1 in 8 (12.5 %) |
| 4 | 1 in 16 (6.25 %) |
| 5 | 1 in 32 (3.125 %) |
| 6 | 1 in 64 (1.563 %) |
| 8 | 1 in 256 (0.391 %) |
| 10 | 1 in 1,024 (0.098 %) |
Frequently asked questions
Is a coin flip really 50/50?
Yes: the tool draws with the browser's secure generator and discards values that would create a bias. Over many flips, the share of heads gets close to 50%.
Which side is heads?
Heads is the side with the portrait or main design; tails is the back, often showing the coin's value.
After 5 heads in a row, is tails more likely?
No: each flip is independent, so it is always one chance in two.