Password Hashing bcrypt Cost Factor Time Calculator

Calculate bcrypt hashing time from cost factor. Time ≈ 2^cost / baseline_hashes_per_second. Cost 10: ~100ms; cost 12: ~400ms; cost 14: ~1600ms. Higher cost = slower brute-force attacks.

Networking
Algorithms
Binary & Number
Systems
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IP Subnet Calculator

IP Address
CIDR Prefix
/
Network
192.168.1.0
Broadcast
192.168.1.255
Subnet Mask
255.255.255.0
First Host
192.168.1.1
Last Host
192.168.1.254
Usable Hosts
254
Binary breakdown:
IP: 11000000.10101000.00000001.00000000
Mask: 11111111.11111111.11111111.00000000
Net: 11000000.10101000.00000001.00000000
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How It Works

Calculate bcrypt hashing time from cost factor. Time ≈ 2^cost / baseline_hashes_per_second. Cost 10: ~100ms; cost 12: ~400ms; cost 14: ~1600ms. Higher cost = slower brute-force attacks

Each component has a specific meaning:

  • Cost factor — The cost factor recorded for the scenario being assessed.

Note: Interpret the bcrypt cost factor result against the thresholds and context described above.

How to Use

Enter the cost factor for the scenario you are assessing. Calculate bcrypt hashing time from cost factor. Time ≈ 2^cost / baseline_hashes_per_second. Cost 10: ~100ms; cost 12: ~400ms; cost 14: ~1600ms. Higher cost = slower brute-force attacks. Use the bcrypt cost factor result to inform your calculation.

Frequently Asked Questions