UUID Collision Risk Calculator

Calculate the mathematical probability of a UUID collision using the Birthday Paradox model with real-time browser cryptographic benchmarking.

Collision Probability Calculator

v4 (122 random bits)

Drag the slider to calculate the exact mathematical risk of generating duplicate UUIDs based on the birthday paradox formula: P ≈ 1 - e^(-n² / 2^(k+1)).

Generated Count (n):1,000,000,000 (1 Billion)

1K (10³)1M (10⁶)1B (10⁹)1T (10¹²)1 Quadrillion (10¹⁵)

Scientific Notation

9.27 × 10^(-19)

Percentage Risk

< 0.000000000000001%

Virtually impossible. You would need to generate 1 billion UUIDs per second for 85 years to have a 50% chance of a single collision.

Client Generation Benchmark

Web Crypto API

Test how many cryptographically secure UUIDs your current device and browser engine can generate per second. Everything runs locally in memory.

UUIDs Generated / Second

Click below to run test (5,000 samples)