About WattPrice

WattPrice answers one question for U.S. households: how much does it actually cost to run that?

Every calculator on this site is computed from authoritative public data:

• Residential electricity rates come from the U.S. Energy Information Administration's Electric Power Monthly, Table 5.6.A, refreshed monthly.
• Appliance assumptions (wattage, typical hours of use, duty cycle) draw on guidance from the U.S. Department of Energy's Energy Saver publications.
• Solar production estimates use peak-sun-hours by location, derived from public irradiance data (NREL/Open-Meteo).

Every page exposes its inputs and lets you override them with your own numbers. The math is shown explicitly. We do not collect personal data to compute results — everything runs in your browser.

WattPrice is independent and reader-supported. We may earn affiliate commissions when you buy products through links on this site, and we display contextual advertising. See our privacy policy and terms.