Weighted Coin Flip
Heads · Tails0 · 00 flips
1 coin
Always tailsAlways heads
About this tool
A weighted coin isn't a fair 50/50 — you decide the chance of heads. Slide the odds anywhere from 0% to 100% and flip. It's a simple, visual biased-coin simulator for exploring probability or settling a not-quite-even bet for fun.
How to use it
- Set the chance of heads with the slider.
- Choose how many times to flip.
- Tap Flip and watch the tally build.
- Change the odds and flip again.
Frequently asked questions
- What is a weighted coin?
- A weighted (or biased) coin is one where heads and tails aren't equally likely. This simulator lets you set that bias to any value — handy because, famously, you can load a die but you can't actually bias a real coin flip.
- Can I use it to teach probability?
- Yes — set the odds, flip many times, and watch the running tally converge on the probability you chose. It's a clear, visual probability demo.
- Can I make it land heads every time?
- Yes — set the chance of heads to 100% (or 0% for always tails).
- Is each flip independent?
- Yes. Every flip uses the same odds and is independent of the last one.
- Is it free and private?
- Completely free, no sign-up. Everything runs in your browser, so nothing you type is uploaded.