What is the difference between Watts and Kilowatt-hours?

Watts measures power rate (instantaneous draw). Kilowatt-hours measures energy quantity consumed over time. Running a 1,000-watt device for 1 hour consumes 1 kWh.

How do I calculate wattage from amps?

Multiply Amps by Volts. For example, a 10-amp device on a 120V outlet draws 1,200 watts (10 × 120 = 1200W).

Do appliances draw power when turned off?

Yes, many electronics draw standby power (phantom load) ranging from 1 to 10 watts. Unplugging them helps reduce energy waste.

How accurate is this energy estimation?

It is highly accurate for steady-state draw. For cycling appliances (like fridges or A/Cs), it represents maximum draw; use an energy monitor for exact cycling profiles.

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Appliance Energy Cost Calculator — Usage & Cost

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