Number Base Converter

Convert numbers between Decimal, Binary, Hexadecimal, Octal and any Custom Base (2-36).

Quick Presets:

Bidirectional Number Base Converter

Edit any base below — all other representations convert simultaneously in real time.

Decimal (Base 10)

Binary (Base 2)

Hexadecimal (Base 16)

Octal (Base 8)

Base 32

Base 36 (Alphanumeric)

Base 58 (Bitcoin Alphabet)

Custom Base:

Convert Arabic numbers (1-3999) to Roman numerals, Roman to decimal, and calendar dates to Roman notation.

Calculate percent of values, proportions, and percentage increases/decreases.

Calculate sales discounts, savings, sale prices, and final totals with sales tax.

Convert length, weight, temperature, speed, data and 13+ math & physical units.