🪙 Coin Flip
Number of flips
🎲 Dice Roller
Dice type
Number of dice
Frequently Asked Questions
Is a coin flip truly random?
This coin flip uses JavaScript's Math.random() which is a pseudo-random number generator (PRNG) — deterministic but statistically uniform. For cryptographic purposes it's not truly random, but for games and decisions it's indistinguishable from a real coin flip. Each flip is independent with exactly 50/50 probability.
What are the standard RPG dice?
Standard tabletop RPG dice: d4 (4 sides), d6 (6 sides — standard), d8 (8 sides), d10 (10 sides), d12 (12 sides), d20 (20 sides — most iconic in D&D), d100/d% (percentile). In Dungeons & Dragons, the d20 is used for most rolls including attacks, ability checks, and saving throws.
What is the probability of rolling a 20 on a d20?
1 in 20, or 5%. In D&D, a natural 20 is called a 'critical hit' and doubles your damage dice. The probability of rolling two 20s in a row is 1/400 (0.25%). Advantage (rolling two d20s and taking the higher) raises the probability of getting at least one 20 to ~9.75%.