Roman Numerals: How to Read and Write Them (1 to 3,999)

Roman numerals still appear on clock faces, book chapters, film credits, event names and building inscriptions. Reading them is easy once you know seven symbols and one rule. This guide explains both, with worked examples — or convert any number instantly with the free Roman Numeral Converter.

The seven Roman numeral symbols

• I = 1
• V = 5
• X = 10
• L = 50
• C = 100
• D = 500
• M = 1,000

There is no symbol for zero — the Roman system was used for counting and recording, not for place-value arithmetic.

The two rules: add and subtract

1. Add when symbols go from largest to smallest: VI = 5 + 1 = 6, LXX = 50 + 10 + 10 = 70, MDC = 1,000 + 500 + 100 = 1,600.
2. Subtract when a smaller symbol sits directly before a larger one: IV = 5 − 1 = 4, IX = 10 − 1 = 9.

In the standard form only six subtractive pairs are used:

• IV = 4 and IX = 9
• XL = 40 and XC = 90
• CD = 400 and CM = 900

A symbol is not repeated more than three times in a row, so 4 is IV, not IIII, and 40 is XL, not XXXX.

How to read a Roman numeral

1. Read from left to right.
2. If a symbol is smaller than the one after it, treat the pair as one subtractive value (such as CM = 900).
3. Otherwise add the symbol’s value.
4. Add all the parts together.

Example: MCMXCIV = M (1,000) + CM (900) + XC (90) + IV (4) = 1,994.

How to write a number in Roman numerals

1. Split the number into thousands, hundreds, tens and ones.
2. Write each part with the largest symbols possible, using the subtractive pairs for 4s and 9s.
3. Join the parts in order.

Example 1: 2026 = 2,000 + 20 + 6 = MM + XX + VI = MMXXVI.

Example 2: 3,999 = 3,000 + 900 + 90 + 9 = MMM + CM + XC + IX = MMMCMXCIX, the largest number in standard Roman numerals.

Example 3: 444 = 400 + 40 + 4 = CD + XL + IV = CDXLIV.

Roman numerals chart: useful values

• 1–10: I, II, III, IV, V, VI, VII, VIII, IX, X
• Tens: X (10), XX (20), XXX (30), XL (40), L (50), LX (60), LXX (70), LXXX (80), XC (90)
• Hundreds: C (100), CC (200), CCC (300), CD (400), D (500), DC (600), DCC (700), DCCC (800), CM (900)
• Thousands: M (1,000), MM (2,000), MMM (3,000)

Common mistakes to avoid

• Subtracting the wrong symbol: 99 is XCIX (90 + 9), not IC.
• Repeating V, L or D: these are never repeated — 10 is X, not VV.
• Writing 4 as IIII: standard form is IV. You will still see IIII on many clock faces, where it is a long-standing design tradition.
• Numbers above 3,999: the Romans showed larger numbers with a bar (vinculum) over a numeral to multiply it by 1,000. Most modern converters, including ours, stick to 1–3,999.

Writing years and dates in Roman numerals

Years are the most common thing people convert. Break the year into thousands, hundreds, tens and ones exactly as above:

• 1999 = M + CM + XC + IX = MCMXCIX
• 2000 = MM
• 2010 = MM + X = MMX
• 2024 = MM + XX + IV = MMXXIV
• 2026 = MM + XX + VI = MMXXVI

For a full date such as a wedding or anniversary, convert the day, month and year separately and join them with dots or dashes, for example 14 · VIII · MMXXVI for 14 August 2026. There is no single official format, so choose one style and use it consistently.

Quick practice (answers below)

1. What is XLIX?
2. Write 768 in Roman numerals.
3. What is MMCDXC?
4. Write 1,444 in Roman numerals.

Answers: 1) XL + IX = 49. 2) DCC + LX + VIII = DCCLXVIII. 3) MM + CD + XC = 2,490. 4) M + CD + XL + IV = MCDXLIV. Check your own examples with the Roman Numeral Converter, which also shows a symbol-by-symbol breakdown.

Where you will see Roman numerals today

• Clock and watch faces
• Book prefaces, chapters and appendices
• Copyright years in film and TV credits
• Names of monarchs and popes, and sequels or annual events
• Outlines and legal documents (sections I, II, III)

Frequently asked questions