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kWh Calculator

Convert appliance wattage and duration into Kilowatt-Hours (kWh) to understand electrical consumption and utility billing.

Calculator Inputs

Live
Currency:
W
1 W10,000 W
hrs
1 hrs1,000 hrs
₹
₹0₹50
Calculation Results
Total Energy (kWh)
12 kWh
Estimated Energy Cost
₹96
Megawatt-Hours (MWh)
0.012 MWh
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How to use the kWh Calculator

  1. 1Enter appliance power rating in Watts.
  2. 2Enter total duration of usage in hours.
  3. 3Optionally enter electricity rate per kWh.
  4. 4View total kWh consumed, equivalent Megawatt-hours (MWh), and total cost.

How kWh is Calculated

One kilowatt-hour equals 1,000 Watts consumed over one hour. Divide total Watt-hours by 1,000 to find kWh.

Mathematical Formula
Energy (kWh) = (Power in Watts × Hours) / 1,000
Formula Variables & Logic

Electric utility meters track energy in cumulative kilowatt-hours (units).

Worked Example: Gaming PC Energy Use
Sample Calculation
Scenario: A high-end desktop computer drawing 450 Watts runs for 6 hours daily.
Step-by-step breakdown
  1. 1Energy = (450 × 6) / 1,000 = 2.70 kWh per day
  2. 2Monthly consumption (30 days) = 2.70 × 30 = 81.0 kWh
Estimated Result
The computer consumes 2.70 kWh daily (81.0 kWh/month).

What affects kWh results

  • Variable load states (e.g. computer idling vs heavy 3D rendering).
  • Cycling duty cycles (compressors turning on and off).
  • Power factor of inductive motor loads.
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Frequently Asked Questions

What is 1 unit of electricity on an electric bill?

In most countries, 1 unit of electricity is defined as exactly 1 Kilowatt-hour (kWh).

How many Watts equal 1 kWh?

Using 1,000 Watts of electrical power for 1 hour consumes 1 kWh of energy.

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