This calculator works out appliance-wise monthly units and energy charges. The total is a bottom-up estimate for the listed household loads, useful for finding which appliance group deserves closer measurement. Replace the example values with information from your own label, bill, drawing, product sheet or land record. Reconcile the calculated units with two or three actual bills and add seasonal or occasional loads that the starter list omits. The formula and every editable assumption remain visible so the result can be checked before it is used for planning. Keep the values and result together when you compare or share this planning scenario.
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Every input includes a simple explanation.
Private: calculations run in your browser. Saved scenarios, preferred electricity rate and land state stay on this device.
Rated power can be different from average power while the appliance is running.
Voltage, automatic on-off cycling and equipment condition can change real use.
Use this as a budget estimate. The appliance label, how often it runs and all charges on your tariff determine the real bill.
Read the meaning first, verify the important details, then avoid the most common planning error.
The total is a bottom-up estimate for the listed household loads, useful for finding which appliance group deserves closer measurement.
Reconcile the calculated units with two or three actual bills and add seasonal or occasional loads that the starter list omits.
A whole-home estimate is incomplete when pumps, kitchen heating, standby loads or seasonal cooling are left out.
Updated 9 August 2026. Changes listed here describe this calculator release; they are not invented historical entries.