NUMBERS & TIME

Number base and Roman numerals

Convert between decimal, binary, octal, hexadecimal and Roman numerals.

Getting the tool ready...

Inputs are processed in your browser. This build does not send them to a server.

How it works

Convert between decimal, binary, octal, hexadecimal and Roman numerals. Fill in the form and choose Convert. It opens with an example already filled in, so you can see how it works first.

What you need

Value
That value is written in (Decimal, Binary, Octal, Hexadecimal, Roman numerals)

What you get

Decimal, Roman
Copy or save the result

Example

The tool opens with Value: 2026; That value is written in: Decimal.

That gives: Decimal: 2026; Roman: MMXXVI.

Good to know

Whole, non-negative numbers only. Uses exact integer arithmetic. Standard Roman numerals stop at 3,999.

Your privacy

What you type is worked out in your browser and is not sent anywhere. There are no accounts, adverts or tracking scripts.