Technical calculators

Network calculators

Browser-local tools for concrete infrastructure calculations. Each calculator shows its formula, units, example, and important edge cases.

CIDR and Subnet Calculator

Calculate an IPv4 network address, subnet mask, broadcast address, address count, and usable host range from an IP and CIDR prefix.

Estimate file transfer time from file size, link speed, and protocol efficiency, with Mbps and MB/s kept distinct.

Calculate the data in flight and minimum TCP window needed to fill a path at a given bandwidth and round-trip time.