About the Coin Flip
Toss a fair virtual coin to settle a decision. The animated flip shows heads or tails, and the tally keeps count of how many of each you've thrown.
Key features
- Fair 50/50 heads or tails
- Animated 3D coin toss
- Running tally with percentages
- History of your recent flips
- Cryptographically secure randomness
- Works offline once the page has loaded
Heads or tails? Flip a coin online
No coin in your pocket? Flip a virtual one. Press the button and the coin spins and lands on heads or tails, with exactly even odds. The tally keeps track of every result, so you can play best-of-three, settle a bet or run a classroom probability experiment.
Quick decision rules
| Situation | How to use it |
|---|---|
| Two options | Assign one to heads, one to tails |
| Who goes first | Call it before the flip |
| Best of three | Flip until one side reaches 2 |
| Sports kick-off | The winner chooses ends or kick-off |
Probability of streaks
| Streak (same side) | Chance |
|---|---|
| 2 in a row | 1 in 4 (25%) |
| 3 in a row | 1 in 8 (12.5%) |
| 5 in a row | 1 in 32 (3.1%) |
| 10 in a row | 1 in 1,024 (0.1%) |
These are the chances of a specific sequence starting now. Over hundreds of flips, long streaks become very likely.
Classroom experiment
- Ask students to predict how many heads they'll get in 10, 50 and 100 flips.
- Flip and record the tally at each point.
- Notice how the percentage settles closer to 50% as the number of flips grows: the law of large numbers.
Related tools
Roll dice with the Dice Roller, pick from more options with Spin the Wheel, or generate numbers with the Random Number Generator.
How to use the Coin Flip
- Open the tool. It's ready to use immediately, with nothing to install.
- Enter your entries, numbers or settings, or keep the defaults.
- Press the main button (spin, roll, start or generate) and watch the result.
- Repeat as often as you like; results are generated fresh each time in your browser.