Time to First Byte (TTFB) Calculator

Calculate and assess Time to First Byte. TTFB = DNS_lookup + TCP_connect + TLS_handshake + server_processing + network_transfer. Good: <800ms; Poor: >1800ms (Google Lighthouse).

Networking
Algorithms
Binary & Number
Systems
Dev Metrics

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
Advertisement

How to Use

Enter the values for the scenario you are assessing. Calculate and assess Time to First Byte. TTFB = DNS_lookup + TCP_connect + TLS_handshake + server_processing + network_transfer. Good: <800ms; Poor: >1800ms (Google Lighthouse). Use the ttfb calculator result to inform your calculation.

Related Calculators

Critical Render Path Time

Computer & IT

CDN Offload %

Computer & IT

Server Response Percentile

Computer & IT

Frequently Asked Questions