A Number to Words Converter turns a numeric value like 1,234 into its written English form, "one thousand two hundred thirty-four", and reads written numbers back into digits. It handles the everyday need to spell an amount out in full — on a cheque, an invoice, a legal document, or a form — where the words carry the same value as the figures and remove any ambiguity about what was meant.
English number names follow the short scale used across the US and modern UK: groups of three digits are named units, thousand, million, billion, trillion, and on up through quadrillion, quintillion, and beyond. Within each group the tool applies the familiar rules — hyphenating compound tens like twenty-one, inserting "hundred" for the leading digit, and never adding an "and" between the hundreds and the tens in American style. Because the integer is processed digit by digit rather than as a floating-point number, very large whole numbers are spelled exactly, past the point where ordinary number types lose precision.
Beyond plain cardinals, the converter produces ordinals (first, second, twenty-third), currency phrasing (one hundred dollars and fifty cents), and decimals read out digit by digit (three point one four). Everything runs in your browser, so nothing you type is uploaded, results appear as you type, and the tool keeps working offline once loaded.
Type a number such as 2024 to spell it out, or type words such as "two thousand twenty four" to convert them back to digits. The tool detects which direction you mean.
When spelling a number, pick cardinal (one, two, three), ordinal (first, second, third), or currency (dollars and cents) to match your document.
The written form appears immediately, with commas and separators in the input handled automatically and decimals read out digit by digit.
Copy the result with one click to paste it into a cheque, invoice, contract, or spreadsheet.
Spell a number into words or parse words back into a number from the same field. The tool auto-detects the direction and lets you force either one.
Produce plain cardinals (one, two, three), ordinals (first, twenty-third), or currency phrasing (one hundred dollars and fifty cents) to fit the document you are filling in.
The integer part is handled as a string, so numbers well past the usual precision limit are spelled correctly, all the way up through quadrillions, quintillions, and decillions.
Decimal values are read digit by digit after "point", and negative values are prefixed with "negative", matching how people say and write them.
Convert numbers to Roman numerals and Roman numerals back to numbers, with instant validation, a symbol breakdown, and full support for the standard 1 to 3999 range.
Convert integers between binary, octal, decimal, hexadecimal, and any base from 2 to 36 with exact BigInt precision and live bit and byte counts
Calculate percentages three ways — what is X% of Y, X is what percent of Y, and percentage increase or decrease between two numbers.
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