Roman to Arabic Numeral Converter

Roman to Arabic Numeral Converter

#→Words Words→# Roman→# #→Roman
Arabic Number
100

C in Arabic numerals is 100.

Roman numerals use seven basic symbols: I = 1, V = 5, X = 10, L = 50, C = 100, D = 500, M = 1000. When reading from left to right, if a smaller symbol comes before a larger one, it subtracts (e.g., IV = 4). Otherwise, symbols add up, which does not happen in this case.

Step-by-step conversion of C:

1. C = 100 → added as normal value.

Final result: +100 = 100 → 100.

How to Use This Converter

Our calculator converts any Roman numeral between I (1) and MMMCMXCVIII (3999) using classical notation, or up to extended notation for larger numbers, with detailed step-by-step explanations.

Step-by-Step Guide:

  1. Enter the Roman numeral - Type any valid Roman numeral (e.g., XIV, MCMXCIX) in the input field
  2. See instant result - The Arabic number appears automatically as you type
  3. View step-by-step explanation - Detailed breakdown shows how each symbol is converted

What You Can Convert:

  • Simple numerals: I, V, X, L, C, D, M
  • Compound numerals: IV (4), IX (9), XL (40), XC (90), CD (400), CM (900)
  • Complex numerals: MCMXCIX (1999), MMXXIV (2024)
  • Range: I to MMMCMXCVIII (1 to 3999)

Roman Numeral System Explained

The Roman numeral system uses seven basic symbols to represent numbers:

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

Reading Rules

  • When a smaller numeral follows a larger one, add the values (VI = 6)
  • When a smaller numeral precedes a larger one, subtract the smaller from the larger (IV = 4)
  • Read from left to right, comparing each symbol with the next to determine addition or subtraction
  • Only I, X, and C can be used as subtractive numerals

Example: Converting C to Arabic Numerals

To convert C to Arabic numerals, we read from left to right, comparing each symbol with the next to apply addition or subtraction rules.

Final result: C = 100

Use the calculator above for detailed step-by-step conversion explanations.

Roman Numerals Chart: 1-100

Complete reference table showing all Roman numerals from I to C (1 to 100). Click any numeral for detailed conversion steps.

Roman Number Roman Number Roman Number Roman Number
I 1 XXVI 26 LI 51 LXXVI 76
II 2 XXVII 27 LII 52 LXXVII 77
III 3 XXVIII 28 LIII 53 LXXVIII 78
IV 4 XXIX 29 LIV 54 LXXIX 79
V 5 XXX 30 LV 55 LXXX 80
VI 6 XXXI 31 LVI 56 LXXXI 81
VII 7 XXXII 32 LVII 57 LXXXII 82
VIII 8 XXXIII 33 LVIII 58 LXXXIII 83
IX 9 XXXIV 34 LIX 59 LXXXIV 84
X 10 XXXV 35 LX 60 LXXXV 85
XI 11 XXXVI 36 LXI 61 LXXXVI 86
XII 12 XXXVII 37 LXII 62 LXXXVII 87
XIII 13 XXXVIII 38 LXIII 63 LXXXVIII 88
XIV 14 XXXIX 39 LXIV 64 LXXXIX 89
XV 15 XL 40 LXV 65 XC 90
XVI 16 XLI 41 LXVI 66 XCI 91
XVII 17 XLII 42 LXVII 67 XCII 92
XVIII 18 XLIII 43 LXVIII 68 XCIII 93
XIX 19 XLIV 44 LXIX 69 XCIV 94
XX 20 XLV 45 LXX 70 XCV 95
XXI 21 XLVI 46 LXXI 71 XCVI 96
XXII 22 XLVII 47 LXXII 72 XCVII 97
XXIII 23 XLVIII 48 LXXIII 73 XCVIII 98
XXIV 24 XLIX 49 LXXIV 74 XCIX 99
XXV 25 L 50 LXXV 75 C 100

Looking for a specific Roman numeral? Use the calculator above or browse popular conversions below.

Key Roman Numerals to Know

Here are the most commonly searched Roman numerals and their values:

  • IV in numbers: 4 (uses subtraction: 5-1)
  • IX in numbers: 9 (uses subtraction: 10-1)
  • XL in numbers: 40 (uses subtraction: 50-10)
  • L in numbers: 50
  • XC in numbers: 90 (uses subtraction: 100-10)
  • C in numbers: 100
  • D in numbers: 500
  • M in numbers: 1000

Roman to Arabic Numerals Chart - Hundreds

C100One hundred
CC200Two hundred
CCC300Three hundred
CD400Four hundred
D500Five hundred
DC600Six hundred
DCC700Seven hundred
DCCC800Eight hundred
CM900Nine hundred

Roman to Arabic Numerals Chart - Thousands

M1000One thousand
MM2000Two thousand
MMM3000Three thousand
MMMM*4000Four thousand

*Extended notation. Classical Roman numerals use overlines for 4000+.

Roman to Arabic Numerals - Tens

X10Ten
XX20Twenty
XXX30Thirty
XL40Forty
L50Fifty
LX60Sixty
LXX70Seventy
LXXX80Eighty
XC90Ninety

Frequently Asked Questions

What is IV in numbers?

IV in numbers is 4. The I before V means subtract 1 from 5, giving us 4.

What is IX in numbers?

IX in numbers is 9. The I before X means subtract 1 from 10, giving us 9.

What is C in numbers?

C in numbers is 100. The letter C represents 100 in the Roman numeral system.

What is L in numbers?

L in numbers is 50. The letter L represents 50 in the Roman numeral system.

What is MMXXV in numbers?

MMXXV in numbers is 2025. MM = 2000, XX = 20, V = 5.