Unit Converters
Convert numbers to Roman numerals and spell numbers in words for cheques, cardinal and ordinal formats.
Content last reviewed
I
1
V
5
X
10
L
50
C
100
D
500
M
1,000
Numerals are added left to right, except when a smaller symbol sits before a larger one — then it's subtracted: IV = 4, IX = 9, XL = 40, CM = 900. The classical system only reaches 3,999 (MMMCMXCIX); larger numbers historically used a bar over a numeral to mean ×1000.
Choose a mode at the top: Roman numerals, or Number to words.
For Roman numerals, pick the direction (Number → Roman or Roman → Number) and type your value; the result and a numeral chart appear below.
For words, type a number and choose a format — plain words, ordinal, or cheque/amount — plus the numbering system (international or Indian).
Copy the result with one click; use "Copy Title Case" for formal documents and cheques.
This is really two classic converters in one place: a Roman numeral translator that goes both ways, and a number-to-words speller for everything from homework to writing amounts on a cheque. Switch between them at the top, type your value, and get an instant, correct result you can copy in a click.
The Roman numeral side converts numbers into the standard subtractive form used today — where IV is 4 and IX is 9 rather than IIII and VIIII — and parses Roman numerals back into ordinary numbers, validating them as it goes so it rejects malformed input like "IIII" or "VX". It covers the classical range 1 to 3,999 (MMMCMXCIX), the span the traditional letters express without the medieval bar-over-numeral trick for thousands. It's the tool for reading clock faces, movie copyright years, book chapters, Super Bowl numbers and monument inscriptions.
The number-to-words side spells any number up to the trillions, with the formats people actually need: plain cardinal words ("one thousand two hundred thirty-four"), ordinals ("twenty-first"), and a cheque/amount format that writes money the way banks expect, complete with currency and "only". It even supports both the international system (thousand, million, billion) and the Indian system (lakh, crore), so "12,34,567" reads naturally as "twelve lakh thirty-four thousand five hundred sixty-seven". Everything runs live in your browser, and every result has copy buttons — including a Title Case version for formal documents.
Reading or writing years, clock faces, chapter numbers and event numbers in Roman numerals.
Writing the amount in words on a cheque, invoice or legal document.
Spelling out numbers for essays, contracts or forms that require words rather than digits.
Converting large numbers into Indian lakh/crore wording for finance and accounting.
In Roman numerals, a smaller symbol before a larger one is subtracted (IV = 4, CM = 900); everywhere else you add. The tool enforces the correct form.
For cheques, use the Title Case cheque format and the "only" ending — banks expect "One Thousand… only" to prevent tampering.
Switch to the Indian numbering system when you need lakh and crore wording instead of million and billion.
Writing 4 as IIII or 40 as XXXX. Standard Roman numerals use subtractive pairs — IV and XL — which this converter produces automatically.
Forgetting the currency's minor units on a cheque. The amount format handles dollars and cents (or rupees and paise) for you, including the decimal part.
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Convert cm, inches, feet, meters, kilometers, miles and more — live, with a full conversion table.
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