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Roman Numeral Converter

Convert between integers and canonical Roman numerals. Arabic integers 1–3,999; uppercase or lowercase Roman input.

Free to useNo sign-upRuns in your browser
Enter your details

Enter the inputs, then select Convert numeral.

Your result
Enter your details

Result will appear here

How Roman Numeral Converter works

Convert between integers and canonical Roman numerals.

Arabic integers 1–3,999; uppercase or lowercase Roman input. Only canonical subtractive notation is accepted, without overlines or zero.

Concept diagram for Roman Numeral Converter, showing arabic integer or roman numeral input and the supported output.
Concept diagram; the three operation images are actual browser captures.

How to use Roman Numeral Converter

Follow the labelled inputs.

Enter arabic integer or roman numeral

Replace the example with arabic integer or roman numeral. The field labels specify the expected format and units.

Convert numeral
Input and settings
Roman Numeral Converter: input and settings in the implemented browser tool
Actual local browser view. Open the image to read it at full size.

Check the remaining inputs

Set input notation. Arabic integers 1–3,999; uppercase or lowercase Roman input.

Convert numeral
Tool result
Roman Numeral Converter: tool result in the implemented browser tool
Actual local browser view. Open the image to read it at full size.

Run, review and save

Select Convert numeral. Review the calculated result, then copy it or download the result text.

Convert numeral
Review the details
Roman Numeral Converter: review the details in the implemented browser tool
Actual local browser view. Open the image to read it at full size.

Examples and uses for Roman Numeral Converter

Check the supplied example

The starting example produces MMXXVI. Convert between integers and canonical Roman numerals.

Convert numeral
Abstract input values and a mathematical worksheet.
Start with the values. Concept illustration.

Use your own inputs

Read the labels for arabic integer or roman numeral and input notation. Arabic integers 1–3,999; uppercase or lowercase Roman input.

Convert numeral
Two calculation examples shown for comparison.
Compare a second example. Concept illustration.

Record a reviewed result

Copy the calculated result into your notes. Keep the formula and assumptions with it if someone else needs to reproduce the calculation.

Convert numeral
A calculation and supporting explanation represented conceptually.
Explain the calculation. Concept illustration.

How to read the result

Read the units and assumptions with the output.

Convert between integers and canonical Roman numerals.

Arabic integers 1–3,999; uppercase or lowercase Roman input. Only canonical subtractive notation is accepted, without overlines or zero.

Convert numeralConvert numeral
A mathematical result connected to the values used to calculate it.
Read the result with its inputs. Concept illustration.

Supported input and limits

Check the stated scope before you run it.

Arabic integers 1–3,999; uppercase or lowercase Roman input. Only canonical subtractive notation is accepted, without overlines or zero.

The input stays in this browser. Copy result and Download save the same displayed text.

Convert numeralConvert numeral
Values and units reviewed before relying on a mathematical result.
Check values and units. Concept illustration.

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Roman Numeral Converter: common questions

Answers about using Roman Numeral Converter and understanding its results.

Which inputs does this tool accept?

Arabic integers 1–3,999; uppercase or lowercase Roman input. Only canonical subtractive notation is accepted, without overlines or zero.

Can I copy or download the result?

Yes. Copy result copies the displayed text, and Download saves the same result as a text file. Calculations run in your browser without an account.

Convert numeral with your input

Check the calculated result, then copy or download it.

Convert numeral