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Number to Words Converter

データ開発者

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入力

自動処理

出力

クライアント側

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ガイド

Number to Words Converter

Convert any number into its written word form instantly. Enter a number — from simple integers to decimals and negatives — and get clean, grammatically correct text in English, French, Spanish, or German. Supports cardinal, ordinal, and currency formats.

使い方

Type or paste a number into the input field. Choose your language and output format (cardinal, ordinal, or currency). The word form appears instantly — copy it with one click. For currency mode, select the currency type to get properly formatted output like “one hundred twenty-three dollars and forty-five cents.”

特徴

Five Languages – English (US), English (UK), French, Spanish, and German with proper grammar rules for each language.
Cardinal Numbers – Standard number words: “one hundred twenty-three” (US) or “one hundred and twenty-three” (UK).
Ordinal Numbers – Position words: “first”, “second”, “twenty-third”, “one hundred twenty-third”.
Currency Mode – Format numbers as currency amounts with dollars/cents, euros/cents, pounds/pence, and more.
Large Number Support – Handles numbers up to quadrillions and beyond.
Edge Cases – Correctly handles zero, negative numbers, and decimal values.
リアルタイム変換 – 入力中またはオプションを変更すると、出力が即座に更新されます。

このツールを使用するタイミング

Use this tool when writing checks, legal documents, or financial reports that require numbers spelled out in words. It’s also useful for language learners practicing number words in French, Spanish, or German, for creating educational materials, or for any context where written-out numbers are preferred over digits — such as formal invitations, contracts, or literary writing.

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 よくある質問

What is the difference between cardinal and ordinal numbers?

Cardinal numbers express quantity — how many of something there are (one, two, three, one hundred). Ordinal numbers express position or rank — where something falls in a sequence (first, second, third, one hundredth). In writing, cardinals answer 'how many?' while ordinals answer 'which one in order?' This tool converts to both formats.
Why is there a difference between US and UK English number words?

The main difference is the word 'and.' In US English, you say 'one hundred twenty-three' — no 'and' between the hundreds and tens. In UK English, you say 'one hundred and twenty-three.' Both are grammatically correct in their respective dialects. The UK style is also standard in Australia, New Zealand, and most Commonwealth countries.
How do you write large numbers in words?

Large numbers follow a consistent pattern in English: groups of three digits get a scale word. One thousand (1,000), one million (1,000,000), one billion (1,000,000,000), one trillion (1,000,000,000,000), one quadrillion (1,000,000,000,000,000). Each group of three digits is converted independently, then joined with the scale word. So 1,234,567 becomes 'one million two hundred thirty-four thousand five hundred sixty-seven.'
How are numbers written differently in French, Spanish, and German?

Each language has unique rules. French uses 'quatre-vingts' (four-twenties) for 80 and 'soixante-dix' (sixty-ten) for 70. Spanish combines teens into single words like 'veintiuno' (twenty-one) and uses 'ciento' before other numbers but 'cien' alone for exactly 100. German creates compound words and reverses tens and ones — 23 is 'dreiundzwanzig' (three-and-twenty). These grammar rules make automated conversion much more reliable than manual translation.