Home Energy

Estimate yearly, monthly, and daily freezer electricity cost from an EnergyGuide label, meter test, or running watts.

Estimate fridge electricity cost from annual kWh, a meter reading, or watts and run time, with optional replacement savings.

Estimate an appliance’s monthly and yearly electricity cost from watts, volts and amps, yearly kWh, or kWh per use.

Estimate appliance energy cost from watts and daily use, or from EnergyGuide yearly kWh, with daily, monthly, and yearly results.

Estimate yearly thermostat savings, payback time, monthly savings, and multi-year net savings from settings or a smart thermostat.

Find the printed HVAC filter size to buy from measured length, width, and depth, plus a quick fit check for odd or loose sizes.

Size a new return air grille or check an existing grille using airflow, open area, and target air speed.

Size round or rectangular HVAC ducts from CFM, then check actual speed, friction rate, and straight-duct pressure drop.

Find ACH from room size and airflow, or find needed CFM or L/s for a target ACH. Includes simple clearing-time estimates.

Calculate CFM for room ventilation or duct airflow, then compare a fan rating and see rounded CFM, ACH, L/s, and m3/h.