What are the seven Roman numeral symbols and their values?

There are seven letters: I = 1, V = 5, X = 10, L = 50, C = 100, D = 500 and M = 1000. Every Roman numeral is made only from these, written from the largest value on the left to the smallest on the right and added together, apart from the six subtractive pairs.

Why is 4 written IV and not IIII?

The modern subtractive rule avoids four identical letters in a row by putting a smaller letter before a larger one to mean subtract, so IV is 5 − 1 = 4 and IX is 10 − 1 = 9. Only six such pairs exist — IV, IX, XL, XC, CD, CM — and only I, X and C are ever subtracted. The older additive style did write IIII, which is why it still appears on clocks.

Why do clock faces show IIII instead of IV?

Many clocks and watches use IIII for four in the older additive style, mainly for visual balance: IIII opposite the VIII on the dial looks more symmetrical, and it keeps the first four hours using only I. It is a stylistic tradition, not an error — both IIII and IV mean four. This converter shows both forms.

Is there a Roman numeral for zero?

No — the Romans had no symbol for zero, because their counting system never needed a place-holder. In the Middle Ages, scholars writing in Latin used the word nulla (meaning 'none') or its initial N to represent zero. This converter shows N for 0 and notes that it has no classical numeral.

What is the largest number in Roman numerals?

In standard notation the largest value is 3999, written MMMCMXCIX, because you cannot use four M's in a row. To go higher, the vinculum (a bar over a letter) multiplies it by 1000, so an overlined V is 5000 and an overlined M is 1,000,000. With the vinculum this converter reaches 3,999,999.

How does the vinculum (bar) work?

A vinculum is a horizontal line drawn over a numeral that multiplies its value by 1000. So V with a bar is 5000, X with a bar is 10,000, and M with a bar is 1,000,000. For a large number, the thousands part is written in ordinary numerals with a bar over it, followed by the remainder in normal numerals: 4000 is an overlined IV, and 1,234,567 is an overlined MCCXXXIV followed by DLXVII.

How do I convert a Roman numeral to a number?

Read the letters left to right, adding their values, but subtract a letter whenever it is smaller than the one immediately after it. So MCMLXXXIV is 1000, then C before M means −100 (giving 900), then LXXX is 80 and IV is 4 — total 1984. This converter does it instantly and accepts additive spellings like IIII too.

How do I write my birth year in Roman numerals?

Split the year into thousands, hundreds, tens and units, convert each part, and join them. For example 1999 is M (1000) + CM (900) + XC (90) + IX (9) = MCMXCIX, and 1984 is MCMLXXXIV. Just type the year into the converter and it does the rest, and shows the breakdown so you can check it.

Mega Roman Numerals Converter

Convert numbers to Roman numerals and Roman numerals back to numbers, both directions at once, updating as you type. Roman numerals are built from seven letters — I (1), V (5), X (10), L (50), C (100), D (500) and M (1000) — written largest to smallest and added up, with six subtractive shortcuts (IV = 4, IX = 9, XL = …

NUMBER

ROMAN NUMERAL

Try:

2,026=MMXXVI

EVERY FORM

Standard (subtractive)MMXXVI

Additive / clock-faceMMXXVI

Vinculum (×1000)— (not needed ≤3999)

HOW IT BREAKS DOWN

ThousandsMM2,000

TensXX20

UnitsVI6

THE SEVEN SYMBOLS

100

500

1,000

HOW TO USE

1
Type a number in the NUMBER box (0 to 3,999,999) — the Roman numeral appears instantly in the box beside it. Or type a numeral in the ROMAN NUMERAL box and the number fills in. Each box drives the other.
2
Read the black result bar for the headline conversion, then the EVERY FORM panel for the standard (subtractive) numeral, the additive / clock-face form, and the vinculum form for large numbers.
3
Use the HOW IT BREAKS DOWN panel to see the numeral split into thousands, hundreds, tens and units, each with its own letters and value — the quickest way to learn how a numeral is built.
4
Tap a quick example, or paste any numeral you have (IIII, XCIX, even overlined forms) — the converter reads it and shows the modern spelling. Then Share the result or Embed the converter on your own site.

HOW ROMAN NUMERALS WORK

Roman numerals are built from seven letters — I (1), V (5), X (10), L (50), C (100), D (500) and M (1000) — written from largest to smallest and added up, so MDCLXVI is 1000 + 500 + 100 + 50 + 10 + 5 + 1 = 1666. To avoid four of the same letter in a row, the modern subtractive rule places one smaller letter before a larger one to mean "subtract": IV is 4, IX is 9, XL is 40, XC is 90, CD is 400 and CM is 900. Only those six pairs are allowed, and only powers of ten (I, X, C) are ever subtracted — which is why 99 is XCIX, not IC. The older additive style wrote every letter out (IIII for 4, VIIII for 9); you still see IIII for four on many clock faces, kept for visual balance opposite the VIII. There is no classical symbol for zero — Roman counting had no need for it — though medieval scholars used the word "nulla" (N). Standard numerals reach 3999 (MMMCMXCIX); beyond that the vinculum, a bar drawn over a numeral, multiplies it by 1000, so an overlined V is 5000 and an overlined M is 1,000,000, extending the system to 3,999,999. This converter reads all of these forms — standard, additive or overlined, in any case — and always shows the clean modern spelling alongside a full symbol-by-symbol breakdown.

FREQUENTLY ASKED QUESTIONS

2026 is MMXXVI: MM is 2000, XX is 20, and VI is 6. Broken down, that is 1000 + 1000 + 10 + 10 + 5 + 1. To write any year, add up the thousands, hundreds, tens and units separately and join them largest to smallest.

2026 = MMXXVI.
MM = 2000, XX = 20, VI = 6.
2024 = MMXXIV, 2025 = MMXXV.
Build it place by place, then join.

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Last updated: — · 7 symbols (I V X L C D M) · standard 1–3999, vinculum to 3,999,999 · Verified by the EagleCalculator team · Eagle-eyed accuracy for every calculation.