Number & Base Tool Suite
Convert between binary, decimal, hex, and octal — with all bases shown at once and step-by-step breakdowns. Everything runs in your browser.
Binary to Decimal
Convert binary (base 2) numbers to decimal.
Decimal to Binary
Convert decimal numbers to binary (base 2).
Decimal to Hex
Convert decimal numbers to hexadecimal (base 16).
Hex to Decimal
Convert hexadecimal (base 16) numbers to decimal.
Binary to Hex
Convert binary (base 2) numbers to hexadecimal.
Hex to Binary
Convert hexadecimal numbers to binary (base 2).
Decimal to Octal
Convert decimal numbers to octal (base 8).
Octal to Decimal
Convert octal (base 8) numbers to decimal.
Binary to Octal
Convert binary (base 2) numbers to octal.
Octal to Binary
Convert octal (base 8) numbers to binary.
Hex to Octal
Convert hexadecimal numbers to octal (base 8).
Octal to Hex
Convert octal (base 8) numbers to hexadecimal.
Any Base Converter
Convert numbers between any bases from 2 to 36.
Decimal to Roman Numerals
Convert decimal numbers into Roman numerals.
Roman Numerals to Decimal
Convert Roman numerals into decimal numbers.
Number to Words
Spell out a number in English words.
Words to Number
Convert a number written in words back to digits.
Scientific Notation Converter
Convert between decimal and scientific notation.
Number to Fraction
Convert a decimal number into a simplified fraction.