Roman Numeral Calculator
Convert between Roman numerals and Arabic numbers (1–3999). Convert numbers to English words. Solve simple math word problems.
Complete User Guide
Roman Numerals: enter Arabic or Roman and convert instantly. Number to Words: convert any integer up to 999,999,999 to English. Word Problems: enter a problem with add/subtract/multiply/divide keywords.
The Mathematical Formula
Subtractive: IV=4, IX=9, XL=40, XC=90, CD=400, CM=900
I=1, V=5, X=10, L=50, C=100, D=500, M=1000. Subtractive: smaller before larger means subtract. 2024 = MM+XX+IV = MMXXIV.
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