Flip a Coin
Need to choose between two options? Flip a coin for a fair heads or tails result, or add your own decision labels.
Make your next decision
Ready when you are
One flip. Two possibilities.
Tap the coin or press Space
Your session
- Total flips
- 0
- Heads
- 0
- Tails
- 0
- Longest streak
- 0
Recent flips · newest first · up to 40 shown
Your flip history will appear here.
Heads or tails, explained
Flip a coin to choose between two options
Assign one choice to heads and the other to tails, then flip the coin. You can choose who starts a game, settle a friendly tie or pick tonight’s film. Agree on the choices before tossing, or select a best-of series if you want the first side to win a majority of rounds to decide.
Start with a fair 50/50 flip. Each coin is an independent draw, including when you flip several coins together. Your previous results do not change the next outcome.
How to flip a coin online
- 1
Choose a flip mode
Use Quick flip for one to five coins, Best of for a first-to-majority series, or Simulation for a batch of up to 100,000 tosses.
- 2
Assign your choices
Keep Heads and Tails or open Custom decision labels and enter two choices, such as Pizza and Pasta. Agree on the labels before you flip.
- 3
Flip the coin
Tap the coin, select Flip coin, or press Space outside a form field. Turn on Instant results to skip the animation. Simulations always return results without a long animation.
- 4
Review or export your results
See heads and tails counts, percentages, the longest streak and recent flips. Export CSV to save every flip in the session, including its label and probability. Clear starts a new session.
A coin toss for quick decisions and bigger experiments
Private, browser-based results
Randomness, custom labels and statistics are processed on your device. No account, remote random-number service or AI is needed.
A satisfying toss, or an instant answer
Watch a gold coin rotate and land, or skip the animation. Reduced-motion preferences are respected automatically, and sound is off until you enable it.
Multiple coins and best-of scoring
Flip up to five independent coins together. For a series, the score is counted for you and a winner is announced as soon as a side reaches a majority.
Useful, exportable probability data
Run thousands of trials, compare counts with expected outcomes and save the complete session as CSV. Each exported row includes the probability used for that flip.
How random is an online coin flip?
This simulator uses Web Crypto’s getRandomValues(), a browser API for cryptographically strong pseudorandom values. It maps those values evenly to 100 possible numbers, rejecting the small remainder that would otherwise introduce bias. At 50% heads, 50 numbers mean heads and 50 mean tails.
The result is chosen before the animation begins. Clicking harder, holding the button or changing the sound does not affect it. Simulation mode can intentionally weight the coin; its current heads probability stays visible above the workspace. This is a local simulator, not an independently verified draw service.
Coin flip probability: why 100 tosses are not always 50/50
For a fair coin, the probability of heads on each toss is 1/2. In 100 tosses, 50 heads is the expected count, not a required result. Runs of heads or tails are normal. Even after five heads in a row, the next fair toss still has a 50% chance of tails.
| Event | Probability |
|---|---|
| Heads on one flip | 1/2 = 50% |
| Two heads in two flips | 1/4 = 25% |
| Exactly one head in two flips | 1/2 = 50% |
| Five heads in five flips | 1/32 = 3.125% |
Try 100 flips, then 10,000 in Simulation. Larger samples tend to bring the observed proportion closer to the chosen probability, although the difference does not shrink on every run. Set heads to 70% to compare a weighted coin with a fair one. Clear the session between experiments if you want separate totals.
When to use a heads or tails coin toss
- Games and team selection. Decide who starts a board game or which team chooses a side.
- Everyday choices. Assign two meals, films or activities to heads and tails.
- Classroom probability. Compare expected and observed frequencies, explore independence and record streaks.
- Friendly tie-breakers. Agree on best of 3, 5 or 7 before starting, then let the score settle the result.
Choosing among more than two names? Use the random name picker .
Flip a Coin FAQs
Is this coin flip simulator really 50/50?
Quick flips and best-of series give heads and tails equal probabilities. Each result uses the browser's cryptographic random number generator with unbiased integer mapping. Simulation mode lets you change the heads probability, and weighted odds are clearly labeled. Equal probabilities do not guarantee equal counts in a short run.
Can I flip a coin 100 or 1,000 times at once?
Yes. Open Simulation and select 100, 1,000 or 10,000, or enter any whole number from 1 to 100,000. Run simulation returns counts and percentages immediately. A session holds up to 100,000 total flips; export and clear it to run more.
How does a best-of-3 coin flip work?
Choose Best of and leave the series length at 3. Flip once per round. The first side to win two flips wins, so the series finishes after two or three tosses. Best of 5 needs three wins and best of 7 needs four. Flip again after a winner to begin a new series.
Can I use a coin flip for a yes-or-no decision?
Yes. Open Custom decision labels and choose Use Yes / No, or type your own two options. Labels change the meaning of each side without changing its probability. Assign both choices before the first toss.
Does the coin flipper work offline, and are my results saved?
Once this page has fully loaded, coin flips, statistics and CSV export work without an internet connection. The simulator sends no labels or results to a server. Results live only in the current tab and are cleared when you reload or close it, so export first if you want to keep them. The surrounding website may make requests for ads or analytics.