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Coin Flip & Dice Roller

Flip coins or roll dice with cryptographic randomness. Single or bulk (up to 1000), full statistics, multiple die sizes.

Fun

Coin Flip & Dice Roller

Generated on April 25, 2026

Uses the browser's 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.

?What is the Coin Flip & Dice Roller?

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.

The 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.

Practical Examples

1

Flip 1 coin to settle a small decision (50/50 odds).

2

Roll 2d6 for Monopoly or board games (sum 2-12).

3

Roll 4d6 drop lowest for D&D character ability scores.

4

Flip 100 coins to demonstrate the law of large numbers — the heads/tails ratio converges to 50/50.

5

Roll 20-sided dice (d20) for Dungeons & Dragons skill checks.

6

Roll d100 (percentile dice) for tabletop RPG random tables.

Frequently Asked Questions

Yes, in the cryptographic sense. crypto.getRandomValues uses your operating system's secure random source (typically /dev/urandom on Linux/macOS or CryptGenRandom on Windows), which incorporates hardware entropy and is suitable for security applications. Math.random by contrast is fast but predictable.

Popular Conversions

Jump to a ready-made conversion — useful for quick reference and sharing:

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