Roman Numerals

I = 1, V = 5, X = 10, L = 50, C = 100, D = 500, M = 1000
Upper or lower case may be used

See the Whole Numbers Unit converters

I   =     1       L =     50 
II = 2 LI = 51
III = 3 LII ... = 52 ...
IV = 4 LX = 60
V = 5 LXI = 61
VI = 6 LXII ... = 62 ...
VII = 7 LXX = 70
VIII = 8 LXXI = 71
IX = 9 LXXII ... = 72 ...
X = 10 LXXX = 80
XI = 11 LXXXI = 81
XII = 12 LXXXII ... = 82 ...
XIII = 13 XC = 90
XIV = 14 XCI = 91
XV = 15 XCII ... = 92 ...
XVI = 16 C = 100
XVII = 17 CC = 200
XVIII = 18 CCC = 300
XIX = 19 CD = 400
XX = 20 D = 500
XXI = 21 DC = 600
XXII ... = 22 ... DCC = 700
XXX = 30 DCCC = 800
XXXI = 31 CM = 900
XXXII ... = 32 ... M = 1000
XL = 40 MM = 2000
XLI = 41 MMM = 3000
XLII ... = 42 ...