Numbers to Words Converter — Spell Out Numbers in English and Vietnamese

When do you need to write numbers in words?

• Cheques/checks: The written amount must match the numeric amount
• Legal documents: Contracts often require amounts written in words
• Formal writing: Style guides recommend writing numbers under 10 in words
• Education: Teaching children to read and write numbers
• Vietnamese documents: Official documents require amounts in Vietnamese words

Rules for writing numbers in English

Basic rules

• Numbers 1–9: always write as words (one, two, three...)
• Numbers 10+: can use numerals in informal writing
• Large round numbers: write as "1 million" not "1,000,000" in running text
• Beginning of sentence: always write as word (never start with a numeral)

Cardinal vs Ordinal

• Cardinal: count (one, two, three) — how many
• Ordinal: order (first, second, third) — what position

Currency format

• 99.50 → "ninety-nine dollars and fifty cents"
• 1,000 → "one thousand dollars"

Vietnamese number words

Special Vietnamese rules

Vietnamese has unique rules that differ from direct translation:

• Unit digit 1 after tens becomes mốt (not một): 21 = "hai mươi mốt"
• Unit digit 5 after tens becomes lăm (not năm): 25 = "hai mươi lăm"
• Single digit after hundreds uses linh: 101 = "một trăm linh một"

How to convert numbers to words free

1. Go to Numbers to Words
2. Type any number
3. Select format: Cardinal, Ordinal, or Currency
4. Select language: English or Vietnamese
5. Copy the result