Roman numerals converter
Convert between roman numerals and numbers. Runs locally in your browser. Free online tool — no sign-up. Clear formulas and worked examples. Try it free.
Enter values to convert.
Formulas
Core equations used by this converter.
How to use
Open the converter
Use the interactive panel at the top of the page.
Enter values
Fill in the required fields for this conversion.
Convert and read the result
Use Convert or let the result update automatically.
Example conversions
Common values with formula and result.
36 ↔ XXXVI
36 ↔ XXXVI
1996 ↔ MCMXCVI
1996 ↔ MCMXCVI
2012 ↔ MMXII
2012 ↔ MMXII
44 ↔ XLIV
44 ↔ XLIV
Roman numerals converter specification
Version 1.1.0 · Engine tested
- Engine tested 4 published cases
- Named expert review Not performed
- Calculation version 1.1.0
- Definition
- **Roman numerals** represent integers with letters. Standard everyday range is **1–3999** using: | Symbol | Value | Symbol | Value | | --- | ---: | --- | ---: | | I | 1 | L | 50 | | V | 5 | C | 100 | | X | 10 | D | 500 | | | | M | 1000 | **Subtractive pairs** avoid four identical symbols in a row: | Pair | Value | Pair | Value | | --- | ---: | --- | ---: | | IV | 4 | XL | 40 | | IX | 9 | XC | 90 | | | | CD | 400 | | | | CM | 900 | There is **no classical symbol for zero**.
- What it calculates
- Convert between roman numerals and numbers. Symbol rules (I, V, X, L, C, D, M), subtractive pairs, conversion chart 1–100+, and worked examples.
- Inputs
- Values required by the selected conversion mode
- Outputs
- Converted result in the target unit or format
- Formula
36 = XXXVI- Roman numerals conversion table
Symbol Value Symbol Value I 1 L 50 V 5 C 100 X 10 D 500 M 1000 - Assumptions
- Conversion runs locally in the browser; values are not uploaded.
- Uses the formulas documented on this page.
- Units
- Formula
- Boundary conditions
- Empty or invalid input yields no valid result.
- Out-of-range values may be rejected by the tool runtime.
- Example
- 36 ↔ XXXVI → 36
- Validation cases
- 36 ↔ XXXVI → 36
- 1996 ↔ MCMXCVI → MCMXCVI
- 2012 ↔ MMXII → MMXII
- 44 ↔ XLIV → XLIV
- Sources
- CalculatorX converter runtime
- Standard unit / encoding definitions where applicable
- Calculation version
- 1.1.0
Background
Interpretation and common distinctions.
Use the converter tabs to switch direction when available. Results for Roman numerals converter update locally in your browser.
Related tools
Frequently asked questions
Key distinctions behind the conversion.
How do you convert using Roman numerals converter?
Use 36 = XXXVI. Example: 36 ↔ XXXVI → 36.
Can I switch direction?
Open the related reverse converter listed under Related tools.
Does this run online or locally?
Calculation runs locally in your browser. Values are not uploaded.
How precise are the results?
Results follow the formulas on this page. Round to the precision your use case needs.