Energy is power × time
A 1,000 W load running for one hour uses 1 kWh. The tariff is applied to that figure.
Power
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Electrical Energy Calculator
Convert power and time into watt-hours, kilowatt-hours and energy cost.
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Enter power, operating hours and optionally a tariff to estimate energy and cost.
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Assumptions and limits.
- Constant average power over the period.
Frequently asked questions
Does this include standby use?
Only the power and duration you enter. Add separate calculations for different operating states.