Tech & IT Calculators

Convert between bits and bytes, size a connection for concurrent users, and estimate monthly data transfer.

Convert between CIDR notation and subnet masks, and see how many addresses each prefix length provides.

Estimate monthly and annual cloud VM cost including storage, egress, reserved instance discounts, and auto-shutdown savings.

Calculate how long a file transfer will take at a given throughput, and the effective speed you actually achieve.

Calculate usable capacity after RAID, formatting overhead, and growth — plus cloud storage cost.

Estimate how long a transfer really takes at a given link speed, including protocol overhead and realistic efficiency.

Convert a start and end IP address into the CIDR blocks that cover it, and count the addresses in a range.

Explore IPv6 prefix sizes, subnet counts, and address space — and expand compressed addresses.

Calculate the correct MTU and TCP MSS for tunnels, VPNs, and overlay networks with encapsulation overhead.

Measure password strength in bits of entropy and see how long an offline attack would take at realistic cracking rates.

Estimate total system draw and the power supply size you should buy, with headroom for transients and efficiency.

Work out usable capacity, fault tolerance and efficiency for RAID 0, 1, 5, 6 and 10 before you buy the drives.

Calculate network address, broadcast, usable host range, wildcard mask, and host count from any IPv4 address and CIDR prefix.

Convert between dotted-decimal subnet masks, CIDR prefixes, wildcard masks, and binary — with host counts.

Convert an SLA percentage into the downtime it actually permits per day, month and year — and see what chaining dependencies does to it.