Estimate how much electricity an appliance uses
and how much it costs to run based on its power,
daily usage and electricity price.
Check the appliance label or manual for its wattage.
Enter the cost charged for one kilowatt-hour (kWh).
Electricity Cost
Estimated Cost for Selected Period
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Daily Usage
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Period Usage
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Daily Cost
Appliance Power
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Daily Operating Time
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Selected Period
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Electricity Rate
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Estimated 30-Day Usage
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Estimated 30-Day Cost
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Estimated Yearly Usage
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Estimated Yearly Cost
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How is electricity usage calculated?
Convert Watts to Kilowatts
Kilowatts = Watts ÷ 1,000
Daily Energy
kWh/day = Kilowatts × Hours Used
Electricity Cost
Cost = kWh × Electricity Rate
Example:
Appliance = 1,500 W
Usage = 8 hours/day
Period = 30 days
Electricity Rate = ₹8/kWh
Daily Energy:
(1,500 ÷ 1,000) × 8
= 12 kWh/day
30-Day Energy:
12 × 30 = 360 kWh
Cost:
360 × ₹8
= ₹2,880
1 electricity unit = 1 kWh.
Therefore, an appliance using 360 kWh has consumed
360 electricity units.
This calculator assumes one constant price per kWh.
Actual electricity bills can differ because utilities
may use slab/tier rates, fixed charges, taxes, subsidies,
fuel charges or other fees.
Appliance wattage is often the rated or maximum power.
Devices such as air conditioners and refrigerators may
cycle on and off, so their actual consumption can differ
from a simple wattage × time estimate.
