Where do I find the wattage?

On the appliance label or manual, usually shown as W or watts.

What if I don't know my per-kWh rate?

We use an approximate country rate; for best results, enter the rate from your bill.

Usually yes — cooling and heating are among the biggest household loads.

Reduce running hours, use higher-efficiency appliances, and avoid peak periods if possible.

No, the calculation is entirely local.

Estimate the monthly and annual cost of running an appliance.

Practical calculatorGeneral editable assumptionsGlobal-readyInteractive chart

Last updated: 2026-05-16

This calculator uses generic assumptions. Use advanced mode to override them for a more accurate result.

Source: default

kWh/mo = (W/1000) × hr/day × days/mo

Where do I find the wattage?: On the appliance label or manual, usually shown as W or watts.
What if I don't know my per-kWh rate?: We use an approximate country rate; for best results, enter the rate from your bill.
Does AC use more than other appliances?: Usually yes — cooling and heating are among the biggest household loads.
How do I save?: Reduce running hours, use higher-efficiency appliances, and avoid peak periods if possible.
Do you store my data?: No, the calculation is entirely local.

Results are estimates and not professional advice. Verify important decisions with a qualified professional.