Write whole numbers in English
Read the integer in three-digit groups: units, thousands, millions, billions and trillions. Each nonzero group is written in words and followed by its scale name.
For example, 1,234 becomes one thousand two hundred thirty-four. This converter uses the English short scale, where one billion means one thousand million. It uses US-style whole-number wording without an extra “and” between hundreds and tens.
Decimals and check amounts
In ordinary number mode, decimal digits are read individually after “point”. Thus 12.050 becomes twelve point zero five zero. The converter preserves those digits instead of turning the input into a floating-point number.
For a US dollar check, 1,234.56 becomes one thousand two hundred thirty-four and 56/100 dollars. A whole dollar amount receives 00/100. Check mode rejects negative amounts or more than two decimal places rather than rounding money silently.
Supported input and verification
Use standard digits with an optional leading minus sign and decimal part. Correctly grouped commas are accepted, such as 1,234,567.89. Currency symbols, exponent notation and misplaced commas are rejected.
The supported integer range is below one quadrillion, with up to 12 decimal places in number mode. Check wording is limited to US dollar amounts. Verify the copied wording against your numeric amount before using it on a document.