Roman numeral converter
Convert Roman numerals to numbers and convert numbers to Roman numerals.
Arabic to roman
XLII
Roman to arabic
42
What can this tool do?
Convert Roman numerals to numbers and convert numbers to Roman numerals.
Convert date and time formats online, including Unix timestamps, ISO 8601, UTC, RFC and Excel date/time.
Convert time between different timezones with ease.
Convert between various units including length, weight, volume, temperature, and more.
Convert between blockchain units (Wei↔ETH, Satoshi↔BTC, Lamports↔SOL, etc.) with live fiat valuation.
Convert number between different bases (decimal, hexadecimal, binary, octal, base64, ...)
Convert color between the different formats (hex, rgb, hsl and css name)
Convert Roman numerals to numbers and convert numbers to Roman numerals.
Copyright © 2026 All rights reserved.