Roman Numerals Converter

Numbers to numerals and back.

Input Parameters

Number (1–3999)

Numeral

ConvertedMMXXVI

Number (1–3999)2026

NumeralMMXXVI

175 available

Annuity and differentiated monthly installments, interest breakdown, and amortization schedule.

Calculate PITI (Principal, Interest, Taxes, Insurance), PMI, and accelerated payoff savings.

Visualize compound growth with recurring deposits, annual rate, and investment horizons.

Add or extract Value Added Tax (VAT) with international country presets.

Analyze profitability and percentage return on business capital and investments.

Gross to net salary with income tax, social contributions and deductions, monthly and annual.

Convert 1–3999 to Roman numerals and validate/parse numerals back.

Subtractive pairs?

IV=4, IX=9, XL=40, XC=90, CD=400, CM=900.

Above 3999?

Classical form stops at MMMCMXCIX — larger needs overlines.

Invalid input?

Malformed strings like IIII are rejected, not guessed.