Appliance Wattage & Energy Calculator

Everyday Life

The Appliance Wattage Calculator works out how much energy an appliance uses and what it costs to run. Enter the appliance's power rating in watts, how many hours you use it per day, and your electricity price. The formula used is: daily energy (kWh) = watts × hours ÷ 1000, and cost = energy × price per unit.

Formula

Daily kWh = Watts × Hours ÷ 1000; Cost = kWh × Price per Unit
  • The Appliance Wattage Calculator updates instantly when you change any value.
  • Formula: Daily kWh = Watts × Hours ÷ 1000, then Cost = kWh × Price per Unit
  • Input definitions: • Power Rating: the appliance's wattage, usually printed on a label or in the manual • Hours Used per Day: how long it runs in a typical day • Electricity Price: what you pay for one kilowatt-hour (unit) of electricity
  • Dividing watt-hours by 1000 converts them to kilowatt-hours (kWh), the unit electricity is billed in.
  • Monthly figures assume 30 days of the same usage.
  • Practical tip: high-wattage appliances used for long periods (heaters, ACs, geysers) dominate your bill — focus on those first.

Example Calculation

Inputs
  • Power Rating (W): 1000
  • Hours Used per Day: 4
  • Electricity Price (PKR per kWh): 50

A 1000 W appliance used 4 hours a day uses 1000 × 4 ÷ 1000 = 4 kWh per day. At PKR 50 per unit that is PKR 200 a day, or about PKR 6,000 a month.

Frequently asked questions

How do I calculate an appliance's energy use?
Multiply its wattage by the hours used, then divide by 1000 to get kilowatt-hours: daily kWh = watts × hours ÷ 1000.
Where do I find an appliance's wattage?
Look on the rating label, the back of the unit, or the user manual. If only volts and amps are given, multiply them to get watts.
What is a kWh?
A kilowatt-hour is the energy used by a 1000 W appliance running for one hour. It is the unit your electricity is billed in.
How is running cost calculated?
Multiply the energy used in kWh by your electricity price per unit. This calculator shows both daily and monthly cost.
Why is my actual bill different?
Real usage varies day to day, tariffs may have tiers or taxes, and some appliances cycle on and off rather than running constantly.