Bcrypt Cost Estimator

Estimate bcrypt hashing time per cost factor and pick the right work factor for your server.

Measured time for cost 10 on your server (ms) — optional:

Estimates appear here…

Estimates only — bcrypt time doubles with each +1 cost. Verify on your production hardware.

How to use

Run the benchmark (or enter a measured cost-10 time) to estimate every cost factor. Everything runs in your browser.

What cost should I use?

Aim for ~250ms–1s per hash on your production server — usually cost 10–12 today.

Are these exact timings?

No — estimates from a quick on-device benchmark. Always measure on your own server.

☕

Every tool runs 100% in your browser — no uploads, no signups. If a tool saved you time, consider supporting us with a small donation.