Coin Flip & Dice

Flip a coin or roll up to 6 dice instantly. Perfect for quick decisions, board games, or settling debates.

Coin Flip

0% Heads50/50100% Heads

Dice Roller

How the Coin Flip & Dice Roller Works

Click to flip the coin or roll up to 6 dice. Results use crypto.getRandomValues() — the same cryptographic RNG browsers use for HTTPS — so outcomes are statistically indistinguishable from true randomness. In other words, it's not just Math.random().

The coin section logs your last 10 flips with a running heads/tails count. The dice section shows the last 5 rolls with individual die faces and totals.

Tips for Fair Decision Making

  • Assign outcomes before flipping. Decide which side means which outcome before you flip, not after — post-hoc assignment defeats the purpose entirely.
  • Notice your reaction. The moment the result appears, pay attention to how you feel. Disappointment reveals your true preference more honestly than extended deliberation.
  • Two dice = 7 is most likely. With two d6, 7 can be made 6 ways out of 36 combinations. 2 and 12 each have only one way — six times rarer. Useful to know for board games.

More flips, a tally, and a weighted-coin slider

History now keeps your last 20 flips — up from 10 — with a live tally: Heads X (Y%) / Tails Z (W%). The percentages track back toward 50/50 as you add more flips, which is satisfying to watch after a lucky streak. The multi-flip SegmentControl lets you throw 1, 5, 10, or 100 coins at once. Flip 100 to run a quick informal probability check; the tally will land close to 50/50 within a few batches.

The weighted-coin slider defaults to 50 % and lets you bias it — say 70/30 — for tabletop game scenarios or to simulate an unfair coin. No rigging mode that auto-picks a winner, no sound effects. Both the coin and dice still use crypto.getRandomValues(), including when the coin is weighted.

Frequently Asked Questions

Is the result actually random or just pseudo-random?
It's cryptographically random. Results use crypto.getRandomValues() — the same RNG browsers use for HTTPS. It's statistically indistinguishable from true randomness and can't be predicted or reproduced.
If I got 5 heads in a row, is tails more likely next?
No. Each flip is completely independent. Thinking otherwise is the gambler's fallacy — after 10 heads in a row, the next flip is still exactly 50/50. The coin has no memory.
Can I flip multiple coins at once?
The coin section flips one at a time. For multiple simultaneous results, use the dice roller — roll one die per "coin" and treat odd as Heads, even as Tails.

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