Bcrypt Cost Estimator
Compare bcrypt cost factors and relative work without entering passwords.
Enter a cost factor between 4 and 18.
Understand bcrypt cost factors
Bcrypt deliberately slows down password hashing, and its cost factor controls exactly how slow — each step up roughly doubles the work. Picking it well balances security against login latency. This estimator shows the relative work of each cost factor so you can choose deliberately.
Crucially, it does no hashing and asks for no passwords — it is an educational comparison of how the cost factor scales, not a place to enter real secrets. Use it to reason about the trade-off before setting the value in your auth code.
Choosing a cost factor
A common target is a hash time near 250ms on your production hardware, raised as machines get faster. The estimate is computed locally and nothing you enter is uploaded.
Frequently Asked Questions
What does the bcrypt cost estimator do?
It processes pasted developer text in your browser and writes a usable result to the output panel.
Does this send code or data to a server?
No. The tool runs client-side in your browser and does not upload your input.
What are the limits?
It is designed for everyday snippets, configuration values, and small files rather than huge production datasets.
Is this free?
Yes. It is a free browser utility with no account required.
Practical utilities for everyday web development work.