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Rime expands numbers, currency, ranges, and measurements into their spoken form automatically. Most formats work without any preprocessing. Just write naturally.
For a tour of text normalization across all categories, see Text normalization. For specific patterns Rime doesn’t expand cleanly, see Pre-normalizing text.

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Numbers

Insert spaces between digits to force digit-by-digit reading: 4 0 reads as “four zero” (not “forty”). For longer alphanumeric IDs and codes, use spell() instead.

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Currency

Supported symbols: $, €, £, ¥. Scale abbreviations K, M, B, bn are recognized.

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Ranges

Ranges with hyphens or en-dashes between numeric values read as “X to Y,” with shared units on the right: 13-50, 35-58 mph, 49-56 °C, 78-84%, 67-77 mg.

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Measurements

A space between number and unit (330 ft) is slightly more reliable than the tight form (330ft). Use the space when you can.

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Phone numbers

US and international formats both work natively, with parentheses, hyphens, or spaces as separators.

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Roman numerals (in context)

Roman numerals expand when they appear after a recognized context word: Henry VIII, Louis XIV, Chapter XV, Act III Scene II, Super Bowl LVIII. Isolated Roman numerals without a context word usually pass through unchanged.

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Known gaps

A few specific patterns aren’t reliably expanded; most commonly very long comma-separated numbers (10,000,000), non-dollar currency shorthand (€900K), the m ambiguity (7m/s), uncommon technical units (kWh, psi), and isolated Roman numerals. For the full list and a drop-in prompt template to handle them, see Pre-normalizing text.