Electric Power Calculator
Calculate electrical power, energy consumption, and running cost.
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FAQs
How do I find the wattage of an appliance?
Most appliances have a label (usually on the back or bottom) showing rated power in watts or VA (volt-amperes). Alternatively, calculate from current and voltage: P = V × I. Smart plugs with energy monitoring can measure actual consumption, which may differ from rated power.
What is the difference between kW and kWh?
Kilowatt (kW) is a unit of power — rate of energy consumption at a moment in time. Kilowatt-hour (kWh) is a unit of energy — the total energy consumed over time. A 1 kW appliance running for 1 hour uses 1 kWh. Electricity bills charge for kWh consumed.
How do I reduce my electricity bill?
Identify high-wattage appliances used frequently — electric heating, hot water, air conditioning, and tumble dryers are the biggest consumers. Replace with efficient alternatives (heat pumps, LED lights), reduce usage time, and shift consumption to off-peak hours if your utility offers time-of-use pricing.