Everyday Life calculator
Electricity Cost Calculator
Estimate appliance electricity use and cost from watts, daily hours, rate, and days.
Formula
Electricity cost
kWh = watts / 1000 x hours per day x days; cost = kWh x rate
1,000 W used 3 hours daily for 30 days uses 90 kWh.
FAQs
Where do I find watts?+
Check the appliance label, charger, manual, or power meter.
Can I use my electricity bill rate?+
Yes. Enter the cost per kWh from your bill for a closer estimate.
How does the Electricity Cost Calculator calculate the result?+
It uses the Electricity cost: kWh = watts / 1000 x hours per day x days; cost = kWh x rate. 1,000 W used 3 hours daily for 30 days uses 90 kWh.
What information do I need to use the Electricity Cost Calculator?+
Estimate appliance electricity use and cost from watts, daily hours, rate, and days.
How accurate is the Electricity Cost Calculator?+
Electricity Cost Calculator applies the formula and assumptions shown on this page. Results may be rounded for readability, so verify changing rates, thresholds, medical guidance, or legal rules with the cited source or a qualified professional.
What should I check before using the Electricity Cost Calculator result?+
Check that the units, dates, rates, and assumptions match your situation. Change one input at a time to understand which values have the largest effect on the result.
Everyday Life guide
How to use the Electricity Cost Calculator
Estimate appliance electricity use and cost from watts, daily hours, rate, and days. The page also explains the electricity cost and shows a practical example: 1,000 W used 3 hours daily for 30 days uses 90 kWh.
- 1
Enter your details
Enter watts, daily hours, rate, and days, then complete any other fields shown in the calculator.
- 2
Check the calculation
Review the result alongside the electricity cost: kWh = watts / 1000 x hours per day x days; cost = kWh x rate.
- 3
Compare scenarios
Change one or more inputs to see how they affect the electricity Cost Calculator result before you use the estimate.
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