Roman numerals 1 to 100
The full run from I to C in the reference below (open on this page), with the handful of patterns that make the whole chart memorisable. The converter handles anything bigger.
Guide
How to use it
- The reference is open below the converter: seven symbols, then 1 to 100 in full.
- Learn the tens spine first: X, XX, XXX, XL, L, LX, LXX, LXXX, XC, C. Every number hangs off it.
- Within each ten, the units repeat the same nine-pattern: I II III IV V VI VII VIII IX.
- Test yourself with the converter, type a number, guess before it renders.
Examples
The patterns that carry it
The two subtractive tens: forty is ten-before-fifty, ninety is ten-before-hundred. They mirror 4 (IV) and 9 (IX) exactly, one rule, four numbers.
The longest numeral under 100, eight characters. Length and size have nothing to do with each other, which is the chart’s recurring lesson.
Subtraction only works in the six fixed pairs: 49 is XLIX (40+9), never IL. The chart shows no exceptions because standard form has none.
Method
How it works
The chart is generated by the same strict converter as the tool, every entry is standard form, three-repeat maximum, subtractives only in the six legal pairs (IV, IX, XL, XC, CD, CM).
The system is base-ten underneath: units, tens and (beyond this chart) hundreds each use the same pattern with bigger symbols, which is why learning 1 to 10 plus the tens spine covers everything to a thousand.
FAQ
Frequently asked questions
What is 100 in Roman numerals?
C, from centum, the Latin hundred that survives in per cent, century and centurion.
Why does the pattern reset at each ten?
Because the notation is positional in spirit: 67 is LX (60) + VII (7), the tens part and the units part never interfere. Read numerals in chunks, not letter by letter.
Which numbers do people get wrong most?
The subtractive tens: 40, 49, 90 and 99 (XL, XLIX, XC, XCIX). If you can write 49 and 99 correctly, the whole chart is yours.
How do I print this?
Print the page from your browser, the chart grid fits on one sheet in portrait, and the symbol row makes a decent classroom strip.
What comes after 100?
The same patterns with C, D and M: 200 is CC, 400 is CD, 900 is CM, 2026 is MMXXVI. The converter above goes to 3,999,999.
Is there a trick for remembering symbol values?
The descending mnemonic "My Dear Cat Loves Xtra Vitamins Intensely" (M D C L X V I) covers the order, the values (1000, 500, 100, 50, 10, 5, 1) halve-and-fifth alternately.
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