How to Measure Appliance Electricity Use

Choose the right measuring method

A plug-in energy meter works well for standard cord-connected loads. A compatible smart plug can track schedules and energy over time. Utility interval data reveals whole-home patterns, while installed circuit monitors can separate hardwired equipment.

• Never exceed a meter or smart plug’s current rating.
• Do not use a basic plug meter on hardwired or high-voltage equipment.
• Use a qualified electrician for panel work.

Measure long enough

A short reading can misrepresent refrigerators, dehumidifiers, pumps, and HVAC equipment. Measure across representative cycles, days, weather, and occupancy.

Separate standby from active use

Record both the low standby draw and the higher active draw. For equipment with long idle periods, annual standby energy can exceed the energy used during short active sessions.

Convert the measurement to cost

Multiply measured kWh by the variable electricity price that applies to the additional usage. For explaining a historical bill, an all-in price can be more intuitive.