Electricity Bill Calculator
Add up what each appliance actually costs you. Enter wattage and hours of use per day, set your tariff per unit, and see the kWh and the money per day, per billing period and per year.
How to use the Electricity Bill Calculator
- Enter your cost per unit (kWh) — it is printed on your bill — and the number of days in the billing period.
- Add each appliance, adjusting its wattage and how many hours a day it runs. Pick 'Other…' to name something that is not in the list.
- Press calculate to see kWh and cost per appliance, plus the totals for a day, the billing period and a full year.
About the Electricity Bill Calculator
An electricity bill is mostly one calculation repeated: watts times hours, divided by a thousand, gives kilowatt-hours — the unit your provider bills you for. What surprises most people is where the units go. A phone charger left plugged in is trivial; an air conditioner, an electric geyser and an old refrigerator are usually the three items responsible for the bulk of a summer bill, and a single 1.5-ton air conditioner running eight hours a day can use more than everything else in a small home combined. Working through the list appliance by appliance shows you which one is worth changing before you start switching off lights. Note that the total here covers the energy portion only: fixed line charges, slab tariffs that step up as you use more, and taxes are added on top by your provider.
Frequently asked questions
How do I calculate the electricity cost of an appliance?
Multiply its wattage by the hours it runs per day, then divide by 1000 to get kWh per day. Multiply that by your cost per unit for the daily cost, and by the days in the period for the bill.
Where do I find my cost per unit?
It is on your electricity bill, usually labelled rate per kWh or per unit. If your provider uses stepped slabs, use the rate for the slab most of your consumption falls into.
Which appliances use the most electricity?
Anything that heats or cools: air conditioners, water heaters, electric ovens, irons and clothes dryers. Refrigerators use moderate power but run all day, which puts them high on most bills too.
Why is my real bill higher than this estimate?
Providers add fixed meter charges, surcharges and tax, and many use slab pricing that raises the rate as consumption rises. This tool estimates the energy portion, which is the part you can actually change.
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