miscomputes
/ˌmɪskəmˈpjutəz/
verb
- Calculates or counts incorrectly; makes a mistake in arithmetic or data processing.
- The accountant miscomputes the total every time she uses the old spreadsheet.
- If the software miscomputes the interest rate, customers will be overcharged.
- He miscomputes his monthly budget and ends up spending more than he earns.