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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.

When to Use a Coin Flip vs Other Random Tools

A coin flip is ideal for binary decisions where you want a fair, fast, no-fuss outcome — go vs. stay, A vs. B, you vs. me. The moment a third option appears, a coin stops being the right tool. Here's the decision tree:

  • 2 outcomes, equal weight. Coin flip — that's what it's built for.
  • 3 to N outcomes, equal weight. Use the Decision Wheel for visual spinning, or the List Randomizer if you want to keep all options ranked instead of picking one.
  • Number in a range. Lottery numbers, dice with custom sides, picking a random page — the Random Number Generator handles arbitrary min/max with no-duplicate options.
  • Weighted choices. If outcomes shouldn't be 50/50, use the weighted-coin slider in the widget above (set to 70/30 or whatever bias you need). For more than two weighted choices, the List Randomizer supports per-item weights.

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.
Are real coins actually 50/50?
Strictly, no. A 2007 paper by Stanford statistician Persi Diaconis and colleagues predicted a small same-side bias of about 51% — physically tossed coins tend to spend slightly more time with the starting face up, due to precession. A 2024 follow-up study collected 350,757 real flips across 48 people and confirmed the prediction empirically: coins landed on the same side they started about 50.8% of the time. This bias only matters if you're betting heavily and you can see the starting position. The digital coin in this tool is unaffected, it uses cryptographic randomness, not physics.
When should I use a coin flip vs a Decision Wheel?
A coin is faster and feels more decisive for two equally weighted options. The Decision Wheel is better when there are 3 or more options, when you want a visual spin animation, or when you want to make the moment feel like an event (group decisions, kids picking who goes first, etc.). For ranking a list rather than picking one, use the List Randomizer.

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By Bam's Thinkery — Updated