Calculate & Convert

Computer Science Calculators

Number bases, hashing, encoding and networking. 4 free tools and counting.

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.