PC Repair & Tech Tools & Calculators
Free, practical tools for fixing and maintaining a PC — convert storage units, estimate download times, size a power supply, calculate an IP subnet, work out screen pixel density, and check a password's strength.
Data Storage Unit Converter
Convert between bits, bytes, KB, MB, GB, TB, and PB in both decimal (SI, 1 KB = 1000 B) and binary (IEC, 1 KiB = 1024 B) systems — and see exactly why a 1 TB drive shows as about 931 GB in Windows
Download Time Calculator
Estimate how long a download takes from the file size and your connection speed, with the megabit-versus-megabyte gotcha handled (100 Mbps ≈ 12.5 MB/s) and a real-world overhead allowance
PC Power Supply (PSU) Wattage Calculator
Add up the draw of your CPU, GPU, RAM, drives, and fans to get an estimated load, then a recommended power-supply wattage with ~30% headroom rounded to a common size for efficiency and upgrades
IP Subnet Calculator
From an IPv4 address plus a CIDR prefix or subnet mask, compute the network and broadcast addresses, netmask, wildcard mask, usable host range, and host counts — the everyday maths of network troubleshooting
Screen Resolution & PPI Calculator
Enter a resolution and diagonal size to get pixel density (PPI), aspect ratio, total megapixels, and the matching display standard (1080p, 1440p, 4K) — compare monitors and laptops at a glance
Password Strength Checker
Estimate a password's entropy in bits and offline crack time from its length and character variety, with a strength rating and tips — runs entirely in your browser and never sends or stores your password