Digital Calculators

Last updated: October 2026

Number Base Converter (Binary, Octal, Decimal, Hex)

Convert a whole number between binary, octal, decimal, hexadecimal or any base from 2 to 36, with exact results for numbers of any length.

Data Size Converter (Bytes, KB, MB, GB, TB, KiB, MiB, GiB)

Convert between bits, bytes, kilobytes, megabytes, gigabytes and terabytes in both the decimal (SI, 1 GB = 10⁹ bytes) and binary (IEC, 1 GiB = 2³⁰ bytes) systems, and see why a 1 TB drive shows up as 931 GB.

Text to Binary, Hex and ASCII Converter

Turn text into its binary, hexadecimal or decimal byte codes and decode such codes back into text.

Two's Complement Calculator (4, 8, 16 and 32-bit)

Write a signed decimal integer as a two's complement binary pattern of 4, 8, 16 or 32 bits, or read a binary pattern back as its signed and unsigned values.

Download Time Calculator (File Size and Internet Speed)

Work out how long a file of a given size takes to download or upload at a given connection speed, in megabits or megabytes per second, with an allowance for real-world throughput and comparisons at common speeds.