Number to Words Converter

Ordinal numbers express rank or position: first, second, third, fourth… (1st, 2nd, 3rd, 4th…). Cardinal numbers express quantity: one, two, three… Use ordinals for dates ("the twenty-first of March"), positions ("she finished fifth"), and numbered items ("Chapter Seven").

Style guides generally say: spell out numbers one through nine (or one through ninety-nine for some guides); use numerals for 10+ in most writing. Always spell out numbers at the start of a sentence. Use numerals for dates, percentages, units of measurement, and money in formal contexts. Legal documents often require both: "$5,000 (five thousand dollars)".

This converter handles integers up to 999 quadrillion (999,999,999,999,999,999) and decimal values. Numbers beyond JavaScript's safe integer range (Number.MAX_SAFE_INTEGER = 9,007,199,254,740,991) may lose precision. For legal or financial documents requiring very large exact numbers, verify results independently.