Number to Words Converter MCP Server

Number to Words Converter

Turn numeric strings into spoken English for display, accessibility, contracts, and agent-generated prose. Pass numbers as strings so decimals stay exact (for example "1234.56").

Capabilities

• Standard: Cardinal wording for the integer part; a decimal point is read as point followed by each fractional digit (e.g. five six for .56). Negative values are prefixed with negative.
• Currency: Whole amount plus hundredths using major and minor unit names — USD (dollars/cents), EUR (euros/cents), GBP (pounds/pence). Amounts are rounded to two decimal places (half-to-even). Singular unit names are used when the count is one.
• Ordinal: Whole numbers only — first, second, twenty-first, one thousand two hundred thirty-fourth, one millionth, etc. Compound tens use hyphens (twenty-first).
• Year: Whole numbers from 1000 through 9999 using common English year reading (nineteen ninety-nine, two thousand, twenty twenty-six, three thousand / thirty twenty-six, twenty-one hundred, ten oh one, etc.).

Gotchas

• Range: Absolute integer part must not exceed 999,999,999,999,999 (trillion-scale grouping).
• Year: No fractional years; negative years are rejected.
• Ordinal: No fractional ordinals — use standard format instead.
• Scientific notation: Not accepted in the string — pass the full decimal form.