Roman Numerals Calculator

The all-in-one Roman numerals app: calculate, convert, validate, and learn: fast, offline, no hassle. ROMAN NUMERALS CALCULATOR Enter two Roman numerals and choose an operation: add, subtract, or multiply. Results appear in both Roman numeral and decimal form. Real-time validation checks your input as you type and flags invalid Roman numeral combinations. Use the dedicated Roman numeral keyboard with I, V, X, L, C, D and M, plus delete and clear buttons for easy input. ROMAN NUMERALS CONVERTER Convert decimal numbers from 1 to 3999 into Roman numerals instantly. See the Roman numeral equivalent automatically as you enter a number, with no extra button required. ROMAN NUMERAL VALIDATOR Check Roman numeral combinations against the classic rules: • I, X, C and M cannot repeat more than three times consecutively • V, L and D cannot be repeated consecutively • Only I, X and C can be used as subtractive symbols • I can only subtract from V or X • X can only subtract from L or C • C can only subtract from D or M • Invalid forms such as IL, IC and XD are flagged LEARN ROMAN NUMERALS Learn the seven main Roman numeral symbols: I = 1 V = 5 X = 10 L = 50 C = 100 D = 500 M = 1000 Understand how Roman numerals are formed and how subtractive notation works. For example, IX represents 9 because I comes before X. ROMAN NUMERALS 1–3999 The app supports Roman numerals from 1 to 3999. The highest supported number is MMMCMXCIX (3999). Roman numerals have no standard representation for zero. Negative and decimal numbers are not supported as Roman numerals. WHO IT'S FOR Useful for students, teachers, history enthusiasts, mathematics exercises, or anyone who needs a quick Roman numeral calculator, converter, or validator. Works offline, with no hassle. DARK THEME AND PREMIUM Dark Theme is available from Settings for a more comfortable experience. An optional Premium Account removes advertisements and supports continued development of the app. Download Roman Numerals Calculator for a simple and fast way to calculate, convert, validate, and learn Roman numerals.