Estimate Big-O operations and runtime for any N. Interactive reference table for all complexity classes from O(1) to O(N!).
Yes, completely free. No sign-up, no credit card, no usage limits.
Never. Everything runs 100% in your browser. Nothing is uploaded to any server.
Yes. All tools are fully responsive and work on phones, tablets, and desktops.
| Complexity | Ops (N=1,000) |
|---|---|
| O(1) | ~1 |
| O(log N) | ~10 |
| O(N) | ~1.0K (thousands) |
| O(N log N) | ~10.0K (thousands) |
| O(N²) | ~1.0M (millions) |
| O(N³) | ~1.0B (billions) |
| O(2^N) | ~1152.9P (quadrillions) |
| O(N!) | ~2432.9P (quadrillions) |