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Flip coins or roll dice with cryptographic randomness. Single or bulk (up to 1000), full statistics, multiple die sizes.
Fun
Generated on July 8, 2026
crypto.getRandomValues for true cryptographic-quality randomness — every flip is independent (each has exactly 50/50 odds), and every die face is equally likely. No browser bias, no patterns.Flip coins or roll dice with cryptographic randomness. Single or bulk (up to 1000), full statistics, multiple die sizes.
The Coin Flip & Dice Roller produces randomized coin flips (heads / tails) and dice rolls (4, 6, 8, 10, 12, 20, or 100-sided) using your browser's cryptographically-secure crypto.
Formula
Coin: P(heads) = P(tails) = 0.5. Dice: P(face) = 1/sides for each side. Bulk results show empirical distribution that converges to theoretical with enough trials.Three classic use cases land here every day. First: you're playing Monopoly or Ludo with cousins at a family gathering and the dice have mysteriously vanished — Ludo King is on someone else's phone — and you need 2d6 right now. Second: you're a D&D player or DM and need a quick d20 check without digging out your physical dice bag. Third: you and your sibling can't agree on something trivial and need a coin flip to settle it. This tool covers all three with proper cryptographic randomness — crypto.getRandomValues, the same source security applications use, not the weaker Math.random. Single flip, bulk mode up to 1,000 coins or 100 dice, full statistics on outputs (heads/tails counts and percentages; total, average, min, max for dice), and support for every standard polyhedron from d4 to d100. The bulk mode is genuinely interesting beyond gaming — flip 100 coins and watch the heads/tails ratio converge toward 50/50, which is the law of large numbers made visible. Statistics teachers love this for class demos. One important reality check: even 100 flips of a fair coin can produce 35-65 heads about 95% of the time, so don't read patterns into small samples. Your brain pattern-matches where no pattern exists.
The Coin Flip & Dice Roller produces randomized coin flips (heads / tails) and dice rolls (4, 6, 8, 10, 12, 20, or 100-sided) using your browser's cryptographically-secure crypto.getRandomValues — true uniform randomness with no bias or patterns. Useful for board games (D&D, Monopoly, Risk), settling disputes, decision-making, statistics demonstrations, and anywhere you need unbiased random outcomes. Bulk mode flips up to 1,000 coins or rolls up to 100 dice at once with full statistics: heads/tails counts and percentages for coins; total, average, min, and max for dice.
Flip 1 coin to settle a small decision (50/50 odds).
Roll 2d6 for Monopoly or board games (sum 2-12).
Roll 4d6 drop lowest for D&D character ability scores.
Flip 100 coins to demonstrate the law of large numbers — the heads/tails ratio converges to 50/50.
Roll 20-sided dice (d20) for Dungeons & Dragons skill checks.
Roll d100 (percentile dice) for tabletop RPG random tables.
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