Roman Numeral Converter

Convert between Arabic numbers and Roman numerals in either direction.

Help Us Improve
4.9 (0)

How to use Roman Numeral Converter

Three quick steps — no sign-up needed

  1. Step 1

    Choose direction

    Select Number → Roman or Roman → Number.

  2. Step 2

    Enter the input

    Type an integer or a Roman numeral string.

  3. Step 3

    Read the result

    Use the conversion for outlines, clocks, or study.

Related Unit Converter tools

View all
Angle Converter Convert degrees, radians, gradians, arcminutes, arcseconds and turns. Area Converter Convert square metres, acres, hectares, square feet and related area units. Cooking Measurement Converter Convert cooking volumes and weights such as cups, tablespoons, grams and ounces. Data Transfer Rate Converter Convert bits and bytes per second including Kbps, Mbps, Gbps and MB/s. Digital Storage Converter Convert bits, bytes, KB, MB, GB, TB and PB. Energy Converter Convert joules, calories, kilowatt-hours and BTU. Fuel Economy Converter Convert fuel economy between MPG (US/UK), km/L and L/100km. Length Converter Convert millimetres, metres, inches, feet, miles and nautical miles.

About Roman Numeral Converter

Roman Numeral Converter changes values between ordinary Arabic numbers and Roman numerals in both directions. Students and designers searching "roman numeral converter", "number to Roman", or "Roman to number" need classic numeral forms for outlines, film years, and worksheets.

Pick Number → Roman or Roman → Number, enter the value, and read the result. Standard form uses additive and subtractive notation (for example 4 is IV, not IIII, in common modern teaching).

Very large numbers and rare ancient variants may be out of scope. For legal or historical scholarship, confirm paleographic conventions separately.

Benefits of Roman Numeral Converter

Both directions Encode and decode Roman numerals.
Study and design use Outlines, clocks, title years.
Clear mode toggle Less input confusion.
Instant conversion No manual tally of M, D, C, L, X, V, I.

Frequently asked questions

What is 2026 in Roman numerals?

MMXXVI.

Is 4 IIII or IV?

Modern teaching usually prefers IV; some clock faces still use IIII.

Can it convert zero?

Classical Roman numerals had no zero - behaviour depends on the tool limits.

Are lowercase roman numerals accepted?

Many converters accept either case; output is often uppercase.

What is the largest supported number?

Practical limits apply - stay within the range the tool accepts.