1. The 7 Basic Roman Numeral Symbols
The Roman numeral system uses seven letters from the Latin alphabet to represent values. All standard Roman numbers are created by combining these seven fundamental symbols:
| Symbol | Arabic Value | Name |
|---|---|---|
| I | 1 | One |
| V | 5 | Five |
| X | 10 | Ten |
| L | 50 | Fifty |
| C | 100 | One Hundred |
| D | 500 | Five Hundred |
| M | 1000 | One Thousand |
2. Roman Numerals Chart: 1 to 100
Use this quick reference grid to find the Roman numeral representation for any integer from 1 to 100.
| 1 - 10 | 11 - 20 | 21 - 30 | 31 - 40 | 41 - 50 | 51 - 60 | 61 - 70 | 71 - 80 | 81 - 90 | 91 - 100 |
|---|---|---|---|---|---|---|---|---|---|
| 1: I | 11: XI | 21: XXI | 31: XXXI | 41: XLI | 51: LI | 61: LXI | 71: LXXI | 81: LXXXI | 91: XCI |
| 2: II | 12: XII | 22: XXII | 32: XXXII | 42: XLII | 52: LII | 62: LXII | 72: LXXII | 82: LXXXII | 92: XCII |
| 3: III | 13: XIII | 23: XXIII | 33: XXXIII | 43: XLIII | 53: LIII | 63: LXIII | 73: LXXIII | 83: LXXXIII | 93: XCIII |
| 4: IV | 14: XIV | 24: XXIV | 34: XXXIV | 44: XLIV | 54: LIV | 64: LXIV | 74: LXXIV | 84: LXXXIV | 94: XCIV |
| 5: V | 15: XV | 25: XXV | 35: XXXV | 45: XLV | 55: LV | 65: LXV | 75: LXXV | 85: LXXXV | 95: XCV |
| 6: VI | 16: XVI | 26: XXVI | 36: XXXVI | 46: XLVI | 56: LVI | 66: LXVI | 76: LXXVI | 86: LXXXVI | 96: XCVI |
| 7: VII | 17: XVII | 27: XXVII | 37: XXXVII | 47: XLVII | 57: LVII | 67: LXVII | 77: LXXVII | 87: LXXXVII | 97: XCVII |
| 8: VIII | 18: XVIII | 28: XXVIII | 38: XXXVIII | 48: XLVIII | 58: LVIII | 68: LXVIII | 78: LXXVIII | 88: LXXXVIII | 98: XCVIII |
| 9: IX | 19: XIX | 29: XXIX | 39: XXXIX | 49: XLIX | 59: LIX | 69: LXIX | 79: LXXIX | 89: LXXXIX | 99: XCIX |
| 10: X | 20: XX | 30: XXX | 40: XL | 50: L | 60: LX | 70: LXX | 80: LXXX | 90: XC | 100: C |
3. Important Landmark Years & Large Numbers
Common historical dates, copyright years, and key milestone numbers written in Roman numerals:
| Number / Year | Roman Numeral | Breakdown |
|---|---|---|
| 1 | I | Base landmark for 1 |
| 5 | V | Base landmark for 5 |
| 10 | X | Base landmark for 10 |
| 50 | L | Base landmark for 50 |
| 100 | C | Base landmark for 100 |
| 500 | D | Base landmark for 500 |
| 1000 | M | Base landmark for 1000 |
| 1500 | MD | Base landmark for 1500 |
| 1990 | MCMXC | 1000 (M) + 900 (CM) + 90 (XC) |
| 2000 | MM | Base landmark for 2000 |
| 2024 | MMXXIV | 2000 (MM) + 20 (XX) + 4 (IV) |
| 2025 | MMXXV | Base landmark for 2025 |
| 2026 | MMXXVI | 2000 (MM) + 20 (XX) + 6 (VI) |
| 3000 | MMM | Base landmark for 3000 |
| 3999 | MMMCMXCIX | 3000 (MMM) + 900 (CM) + 90 (XC) + 9 (IX) |
Converting a custom year or a large number greater than 3,999? Type any integer into our Roman Numeral Converter to generate its standard, vinculum, or apostrophus notation.
Days of the Week in Roman Numerals
Standard ISO order designates Monday as the 1st day of the week and Sunday as the 7th day:
| Day of the Week | Day Number | Roman Numeral |
|---|---|---|
| Monday | 1 | I |
| Tuesday | 2 | II |
| Wednesday | 3 | III |
| Thursday | 4 | IV |
| Friday | 5 | V |
| Saturday | 6 | VI |
| Sunday | 7 | VII |
4. How to Read & Write Roman Numerals (The 4 Rules)
Roman numerals are evaluated from left to right using four core arithmetic rules:
1. Additive: Symbols placed after a larger symbol are added (VI = 5 + 1 = 6). 2. Subtractive: Symbols placed before a larger symbol are subtracted (IV = 5 - 1 = 4). 3. Limit of 3: Do not repeat a symbol more than 3 times in a row (3 = III, 4 = IV). 4. Non-repeatable: Never repeat V, L, or D. Rule 1: Addition
When a smaller numeral appears after a larger numeral, add the values together:
- VI = 5 + 1 = 6
- XII = 10 + 1 + 1 = 12
- CLV = 100 + 50 + 5 = 155
Rule 2: Subtraction
When a smaller numeral appears before a larger numeral, subtract the smaller value from the larger one. Only six subtractive pairs are allowed in standard notation:
- IV = 5 - 1 = 4
- IX = 10 - 1 = 9
- XL = 50 - 10 = 40
- XC = 100 - 10 = 90
- CD = 500 - 100 = 400
- CM = 1000 - 100 = 900
Rule 3: Repetition Limit
The symbols I, X, C, and M can be repeated up to three times consecutively. For example, 3 is written as III and 300 is written as CCC. To express 4 or 400, you must use subtraction (IV and CD).
Rule 4: Non-Repeatable Symbols
The symbols V (5), L (50), and D (500) can never be repeated, and they are never placed before a larger symbol for subtraction.
Large Numbers in Roman Numerals
Standard Roman numeral notation maxes out at 3,999 (MMMCMXCIX) because rules limit repeating M (1,000) to three consecutive occurrences. To write numbers into the thousands, millions, or higher, ancient and medieval mathematicians utilized specialized notation systems: the Vinculum (Overline) method and the Apostrophus method.
The Vinculum Method (Bar Notation)
The most common classical method for large numbers places a horizontal line (a vinculum) over a Roman numeral to multiply its value by 1,000:
| Standard Symbol | Value | Vinculum Notation | Multiplied Value |
|---|---|---|---|
| V | 5 | V̄ | 5,000 |
| X | 10 | X̄ | 10,000 |
| L | 50 | L̄ | 50,000 |
| C | 100 | C̄ | 100,000 |
| D | 500 | D̄ | 500,000 |
| M | 1,000 | M̄ | 1,000,000 |
The Apostrophus Method
Originating in the late Roman Republic and widely used throughout early European printing, the Apostrophus method constructed large values using nested crescent shapes (resembling parentheses C and Ɔ) wrapped around a central vertical bar (I).
1. IƆ = 500 (Base half-circle) 2. CIƆ = 1,000 (Enclosed circle around I) 3. Adding Ɔ to the right multiplies a 5-based number by 10 (IƆƆ = 5,000). 4. Adding C and Ɔ symmetrically multiplies a 1,000-based number by 10 (CCIƆƆ = 10,000). | Value | Apostrophus Notation | Standard Equivalent | Structural Breakdown |
|---|---|---|---|
| 500 | IƆ | D | Base half-circle symbol |
| 1,000 | CIƆ | M | Full circle enclosed symbol (100 × 10) |
| 5,000 | IƆƆ | V̄ | 500 × 10 (additional outer Ɔ) |
| 10,000 | CCIƆƆ | X̄ | 1,000 × 10 (additional outer C and Ɔ) |
| 50,000 | IƆƆƆ | L̄ | 5,000 × 10 (third outer Ɔ) |
| 100,000 | CCCIƆƆƆ | C̄ | 10,000 × 10 (third outer C and Ɔ pair) |
Frequently Asked Questions
What is 2026 in Roman numerals?
The year 2026 in Roman numerals is MMXXVI (2000 = MM, 20 = XX, 6 = VI).
Is there a zero in Roman numerals?
No. The ancient Roman numeral system did not have a numeral symbol for zero (0). The concept of zero as a placeholder value was later popularized by Indian and Arabic mathematicians. Romans used the word nulla (meaning "none") when referencing zero values.
What is the largest number in standard Roman numerals?
Without using special overline bars (vinculum), the largest standard Roman numeral is 3,999, written as MMMCMXCIX.
Why do some clocks use IIII instead of IV for 4?
Clockmakers often use IIII instead of IV to maintain visual balance across the clock face, creating symmetry with VIII on the opposite side, and to honor traditional centuries-old watchmaking customs.
How do I convert a large modern number into Roman numerals?
You can break the number down by thousands, hundreds, tens, and units manually, or use our automated Roman Numeral Converter to instantly translate any number into accurate Roman numerals.
Looking to simplify fractions or handle ratio conversions? Try our Fraction Calculator or explore the Ratio Calculator