Coin flip
Flip one or more coins, with a running tally.
The coin flip tool flips a chosen number of coins at once and keeps a running heads/tails tally across flips in the current session — a quick way to settle something or just watch how the count evens out over time.
Tally this session
Heads 0 · Tails 0
How to use
- Set how many coins to flip at once, then click "Flip".
- Each flip is independent — the running tally just counts up heads and tails across flips in this session.
- Click "Reset tally" to zero the count without affecting the next flip.
Common use scenarios
- Settling a simple two-way decision quickly.
- Demonstrating probability or the law of large numbers for a class.
- Flipping multiple coins at once for a game that needs it.
- Just watching how heads/tails balance out over many flips.
✓Content & verification reviewed: 2026-08-25
How we verify Coin flip
How to read the result and the running tally correctly.
Each flip is independent
Every coin flip has an equal, independent chance of heads or tails — a streak of the same result doesn't make the opposite result any more or less likely on the next flip.
The tally accumulates across flips, not within one flip
Flipping 5 coins at once and getting 3 heads adds 3 to the heads tally and 2 to the tails tally — the tally is a running total across every flip you've made this session, not a per-flip count.
Resetting the tally doesn't affect the next flip's odds
The reset button only zeroes the displayed counts — it doesn't change anything about how the next flip is generated, since each flip was already independent of the tally.
Before you rely on the result
- You understand each individual coin's result is independent of past flips.
- You're reading the tally as a running total across flips, not a single-flip count.
- If you reset the tally, you know it doesn't change the fairness of future flips.
- You're using this for casual decisions, not a certified fair-gaming context.
Who this is for
- Anyone settling a quick two-way decision.
- Teachers demonstrating probability or the law of large numbers.
- People who need to flip multiple coins at once for a game.
- Anyone curious to watch heads/tails balance out over many flips.
Real-world examples
Quick decision between two options
Two people can't agree on who goes first, so they flip a coin once and go with the result.
Probability demonstration
A teacher flips 20 coins at once repeatedly to show a class how the heads/tails split tends toward 50/50 as the sample size grows.
Game mechanic
Someone playing a tabletop game that calls for a coin flip uses the tool instead of digging up a physical coin.
Limitations
- Uses Math.random(), which is fine for casual use but isn't a certified fair-gaming random source.
Frequently asked questions
Does a streak of heads make tails more likely next?
No — each flip is independent, so a streak of heads doesn't change the odds of the next flip at all; it's still a fresh 50/50 chance.
What does the tally actually count?
It's a running total of every individual coin result across all your flips this session, not a count of flip events — flipping 3 coins and getting 2 heads adds 2 to the heads tally, not 1.
Does resetting the tally change how fair the next flip is?
No — resetting only clears the displayed counts; the underlying flip is generated the same independent way regardless of the tally.
Is this suitable for a real-money bet or official drawing?
No — it uses Math.random(), which is fine for casual use but isn't a certified fair-gaming random source for anything with real stakes or legal requirements.
🔒 Runs in your browser — nothing is uploaded. Results are for reference only; see the disclaimer. Last updated: 2026-08-25
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