Number to Words Converter: From 123 to “One Hundred Twenty-Three”

Created on 9 November, 2025 • Converter Tools • 0 views

Convert numbers into words accurately, with locale, currency, and grammar options. Perfect for invoices, legal documents, checks, voice UIs, and accessibility.

Why Spelling Out Numbers Matters

A number-to-words converter transforms numeric values into written words for documents and interfaces. This improves clarity (“1,200.50” → “one thousand two hundred dollars and fifty cents”), aids accessibility, and reduces ambiguity in legal contexts.

Core Features You’ll Want

Locale and Style Options

1. Language and dialect: “one hundred and twenty-three” (UK) vs “one hundred twenty-three” (US).
2. Hyphenation rules: “twenty-one,” “one-hundred-and-one.”
3. Pluralization: “1 dollar,” “2 dollars,” localized correctly.

Currency and Units

1. Format integer and fractional parts (“242.15” → “two hundred forty-two dollars and 15 cents”).
2. Support other units (meters, kilograms) and ordinal forms (“21st”).

Handling Edge Cases

1. Large scales: million, billion, trillion… with short/long scale differences by locale.
2. Negative numbers: prefix “minus” or parenthetical styles.
3. Zero and empty: decide between “zero,” “nil,” or blank by context.

Developer and Content Tips

1. Keep a deterministic output style—don’t mix US/UK forms in one document.
2. Provide testing for boundaries (0, 10–19, 20–99, 100–999, powers of 10).
3. Expose a compact mode for voice UIs where brevity helps.