Hash Collision Probability
Calculate the birthday-paradox collision chance for a hash size.
About this calculator
Probability of at least one collision among k items in an n-bit hash space ≈ 1 − e^(−k² ÷ 2ⁿ⁺¹).
Probability of at least one collision among k items in an n-bit hash space ≈ 1 − e^(−k² ÷ 2ⁿ⁺¹).