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Appliance Energy Calculator

Appliance Energy Calculator is part of Toolspire and is ready as soon as this page loads. kWh = watts × hours ÷ 1000. The rate is whatever your bill charges per unit. The electricity-bill page is a whole month. This page is one appliance.

Runs in this tabFreeNo account

On this page

What you can do here

One appliance

The monthly bill page is the whole house. This is one nameplate and one runtime.

The 2 kWh check

A kilowatt for two hours.

The rate is yours

8 is a sample rupee price, not a tariff lookup.

The sequence

How to use the Appliance Energy Calculator

  1. 1

    Read watts on the appliance

    1000 is a small heater, not a phone charger.

  2. 2

    Estimate hours actually on

    A rating is not a duty cycle. Two hours means two hours of running.

  3. 3

    Check ₹16

    2 kWh times 8.

Worth knowing

  • Appliance Energy Calculator on Toolspire: 1000 W × 2 h ÷ 1000 = 2 kWh.
  • At ₹8 per kWh the cost is ₹16.
  • A watt is a joule per second. The ÷ 1000 turns watt-hours into kilowatt-hours, the unit on a bill.
  • A fan rated 75 W running 8 hours is 0.6 kWh, not 600.

The unit on the bill is the kilowatt-hour

Power in watts times hours is watt-hours. Dividing by 1000 gives kilowatt-hours, which is what a domestic bill calls a unit. A 1000 W load for 2 hours is exactly 2 units. At 8 currency units per kWh the energy costs 16. A device that cycles, or a charger that only draws its rating while charging, uses less than nameplate watts times the hours it is plugged in. The page uses the watts and hours you type.

FAQ

Questions about Appliance Energy Calculator

Where does Appliance Energy Calculator run?

Appliance Energy Calculator runs in this tab on Toolspire. What you type or drop in is not sent to us and is not stored on a server.

How many kWh is 1000 W for 2 hours?

2 kWh.

What does that cost at 8 per kWh?

16.

What is 75 W for 8 hours?

0.6 kWh. 75 × 8 / 1000.

Is the rate looked up?

No. Type the per-unit price from your bill.

Keep going

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