Enter a number to spell it out in Spanish or English — useful for checks, contracts and legal documents.
This tool converts a number into written words following standard Spanish (RAE) or English rules — the format used on checks and legal documents. In Spanish, 'uno' shortens to 'un' before a noun (veintiún, treinta y un), 100 is 'cien' alone but 'ciento' in 101-199, and 'y' only appears between tens and units, never after hundreds. Add a currency to append the amount format used on real checks (e.g. pesos with 00/100 M.N. for Mexico).
To convert a number to words, break it into groups of hundreds, tens and units from the largest place value down, spell each group using standard number names, and join the groups with 'thousand' or 'million' where needed. Example: 1,234 becomes 'one thousand two hundred thirty-four' (or, in Spanish, 'mil doscientos treinta y cuatro').
"One million two hundred thirty-four thousand five hundred sixty-seven."
"Un millon doscientos treinta y cuatro mil quinientos sesenta y siete."
999,999,999 -- entering 1,000,000,000 or more shows an error, since amounts of a billion or higher aren't supported.
Exactly 100 is 'cien'; 'ciento' is only used when another digit follows, for example 101 is 'ciento un' (this tool always uses the shortened 'un' form, never 'uno').
This tool always uses the shortened form that agrees with a following noun -- as in currency amounts like 'veintiun euros' -- even when no currency is selected.
No -- only English and Spanish are available, and both use standard thousand/million grouping; Indian-style lakh/crore isn't supported.
"One million."
Spanish shows 'Mil doscientos treinta y cuatro euros 56/100'; English shows 'One thousand two hundred thirty-four dollars and 56/100' -- cents are rounded to the nearest hundredth.
| Number | Spanish words |
|---|---|
| 15 | Quince |
| 16 | Dieciséis |
| 21 | Veintiún |
| 100 | Cien |
| 101 | Ciento un |
| 116 | Ciento dieciséis |
| 1,000 | Mil |
| 1,234 | Mil doscientos treinta y cuatro |
| 21,000 | Veintiún mil |
| 1,000,000 | Un millón |
This tool always spells numbers as if they precede a noun — the way they appear on a check ('veintiún pesos') or in a contract clause. That shortened form (apocope) is standard RAE usage before a noun; a number said completely on its own, with nothing following it, would use 'veintiuno' instead.
'Cien' is used only for exactly 100 by itself or before 'mil'/'millones'. Any number from 101 to 199 uses 'ciento' as a prefix, as in 'ciento dieciséis' (116).
Select MXN from the currency dropdown. The tool appends 'pesos', the cents as a fraction out of 100, and the 'M.N.' (Moneda Nacional) suffix used on Mexican checks.
Up to 999,999,999 (just under one thousand million), which keeps the output within standard short-form number names without needing 'billón' or long-scale terms that vary by country.
This tool follows standard RAE spelling conventions for Spanish and standard American usage for English; some countries and institutions use slightly different check-writing conventions (e.g., 'con' instead of a slash for cents). Confirm your bank's or notary's exact required format before using this text on an official document.
Last updated: 2026-08-17