About PlugMath

PlugMath publishes free calculators for electric-vehicle charging cost, time, efficiency and charger power, plus energy and electrical unit converters. Each page shows the formula, the assumptions behind it and the sources used, and the underlying math is covered by automated tests.

Limits

Results are estimates for planning and comparison. Real charging depends on the vehicle, battery temperature, charger, and your utility rate. PlugMath does not give financial, tax, legal or electrical-installation advice.

Advertising

The site is free to use and may later display advertising or affiliate links, which would be clearly labeled.

Corrections and contact

To report an error or ask a question, email plainaiguide+plugmath [at] mail.grokbot.com. Each calculator page shows the date it was last reviewed against its sources.