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A Roman numeral converter translates between modern Arabic numerals and Roman numeral notation. Romans used letters I, V, X, L, C, D, and M to represent numbers.

公式

I=1, V=5, X=10, L=50, C=100, D=500, M=1000

I: 1 — 1
V: 5 — 5
X: 10 — 10
L: 50 — 50
C: 100 — 100
D: 500 — 500

ステップバイステップガイド

1I=1, V=5, X=10, L=50, C=100, D=500, M=1000
2Subtract when smaller precedes larger: IV=4, IX=9, XL=40, XC=90, CD=400, CM=900
3Add otherwise: VI=6, XI=11, LX=60
4No zero or fractions in Roman numerals

解いた例

入力

2026

結果

MMXXVI (M+M+X+X+V+I = 1000+1000+10+10+5+1)

よくある質問

What is Roman Numeral?

A Roman numeral converter translates between modern Arabic numerals and Roman numeral notation. Romans used letters I, V, X, L, C, D, and M to represent numbers

How accurate is the Roman Numeral calculator?

The calculator uses the standard published formula for roman numeral. Results are accurate to the precision of the inputs you provide. For financial, medical, or legal decisions, always verify with a qualified professional.

What units does the Roman Numeral calculator use?

This calculator works with inches. You can enter values in the units shown — the calculator handles all conversions internally.

What formula does the Roman Numeral calculator use?

The core formula is: I=1, V=5, X=10, L=50, C=100, D=500, M=1000. Each step in the calculation is shown so you can verify the result manually.

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