Electricity Usage Calculator
Calculate your daily, monthly, and annual kilowatt-hour (kWh) electricity usage based on equipment wattage, daily operating hours, and power factor.
Device Power & Operating Time
Electricity Consumption Formula
Energy Consumption (kWh) = [Power (Watts) × Power Factor × Daily Operating Hours] ÷ 1,000- Power (Watts): Nameplate or measured electrical wattage of the appliance or motor.
- Power Factor: Ratio of real working power to apparent power (1.0 for purely resistive loads; 0.85-0.95 for inductive motors and compressors).
- Operating Hours: Number of active duty cycle hours the device draws current each day.
Step-by-Step Worked Example
Calculation Steps:
How to Use This Calculator
Assumptions & Limitations
- Assumes steady-state electrical operation during the specified duty hours.
- 1,000 Watt-hours is equivalent to exactly 1 kilowatt-hour (kWh).
Frequently Asked Questions
What is the difference between Watts and kilowatt-hours (kWh)?
Watts (W) measure the instantaneous rate of power consumption at a single moment, while kilowatt-hours (kWh) measure total energy consumed over time (1,000 Watts operating continuously for one hour equals 1 kWh).
How do I find an appliance's wattage rating?
Look for the manufacturer's label on the back or underside of the device. If only Volts (V) and Amps (A) are listed, calculate Watts by multiplying Volts by Amps (e.g., 120V × 5A = 600W).
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