About Watt's My Charge

Watt's My Charge is a small collection of free calculators that answer one question: what does it actually cost to run this?

The site is built by someone who works in commercial energy efficiency, helping businesses cut their electricity use with better HVAC, lighting and refrigeration. The same math that matters for a restaurant matters at home, and most people never get to see it. These tools make it simple.

All calculators run in your browser. Results are estimates based on the numbers you enter and typical values for common appliances. Default electricity rates are based on U.S. Energy Information Administration data.

Have an idea for a calculator? Get in touch.