Computer Science Calculators
Number bases, hashing, encoding and networking. 9 free tools and counting.
Tools for the layers most people never see: binary and hexadecimal, bitwise operations, subnet masks, Base64, download times and aspect ratios. Handy for students learning how computers count — and for developers who just need the answer without opening a REPL.
Number Base Converter
Convert between binary, octal, decimal and hexadecimal.
Base64 Encode / Decode
Encode text to Base64 or decode it back.
Color Converter
Convert colours between HEX, RGB and HSL.
Subnet / CIDR
Network range, mask and host count from CIDR notation.
Download Time Calculator
How long a file takes to download at a given connection speed.
Aspect Ratio Calculator
Simplify a width and height to a ratio, and resize without distortion.
Bitwise Calculator
AND, OR, XOR, NOT and bit shifts of two integers, with binary shown.
PPI / Pixel Density Calculator
Pixels per inch and dot pitch from a screen resolution and diagonal size.
Video File Size Calculator
File size from bitrate and duration — or the bitrate a size budget allows.