Convert Words to Integers

Ones (zero-nine), teens (ten-nineteen), tens (twenty-ninety), and scale words (hundred, thousand, million, billion, trillion). Plus “negative” or “minus” prefix and “and” connector. Anything else (including “a”, “uno”, “dos”, “twenty-twenty”, “infinity”) triggers an explicit error.

Silent skipping hides bugs: "five potatoes" would look like 5 and "twenty foo" like 20, so typos produce plausible but wrong numbers. The parser reports the exact word and position it could not read, letting you fix the input instead of trusting a bad result.

Not currently. “a” isn’t in the dictionary. Use one hundred or one thousand instead.

Not supported. Ordinals require a different parser. For now, use the cardinal forms: one, twenty-three.

One trillion = 1,000,000,000,000 = 10^12. JavaScript’s Number can hold up to 2^53 – 1 (≈ 9 × 10^15), but the English vocabulary in this tool stops at trillion. For larger values, use scientific notation outside this tool.

Not supported in either direction. "three point five" errors because “point” isn’t in the dictionary. For decimals, use a different tool that handles “point” / “decimal” / fractional words.

Yes. -100 → "negative one hundred". -1234 → "negative one thousand two hundred thirty-four".

This tool uses the modern (short-scale) definition: billion = 10^9. The British long-scale billion (= 10^12) is no longer commonly used in UK English either. If you specifically need long-scale, multiply manually.

No. Everything runs in your browser with JavaScript – nothing is sent to a server, logged, or stored, and the tool keeps working offline once the page has loaded.

Each line is parsed independently. Lines that fail show ERROR: ... at their position in the output. Stats show success/failure counts.