Electricity Consumption Calculator

Estimate electrical energy use from wattage, running time and load factor. Enter your own values below to see electricity consumed and check the method behind it.

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Your inputs

Change the example values to match your situation.

Your result

Let’s work it out.

Fill in your inputs and select Calculate.
Your result and breakdown will appear here.

How this calculator works

Energy = rated watts ÷ 1000 × hours per day × days × average load factor. Cost = energy × entered tariff.

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What is Electricity Consumption Calculator?

Electricity Consumption Calculator helps you estimate electrical energy use from wattage, running time and load factor.

The main result is electricity consumed, with a breakdown of cost. The formula, example and assumptions below explain how to interpret it.

How to use Electricity Consumption Calculator

Use the example to get familiar with the form, then enter your own figures. Any rates in the example are illustrative. Check the field labels and units before calculating.

  1. Gather rated power (W), hours switched on per day (hours), average duty / load factor (%), number of days and electricity rate per kWh (₹). Use values from the same situation or reporting period.
  2. Replace the example rated power with your own value, then complete the other fields. Check the displayed units.
  3. Select Calculate and read electricity consumed with its result breakdown. Change one input and calculate again to compare a second scenario. Reset restores the original example.
  • Enter rated power in W, at least 0. Decimals are accepted.
  • Enter hours switched on per day in hours, at least 0 and at most 24. Decimals are accepted.
  • Enter average duty / load factor in %, at least 0 and at most 100. Decimals are accepted.
  • Enter number of days, at least 1 and at most 3660. Use a whole number.
  • Enter electricity rate per kWh in ₹, at least 0. Decimals are accepted.

Electricity Consumption Calculator: a worked example

With the inputs below, the result is 240 kWh (electricity consumed). Follow the example, then replace these illustrative values with your own.

Example inputs and output
Input or outputExample value
Rated power (W)1,000 W
Hours switched on per day (hours)8 hours
Average duty / load factor (%)100 %
Number of days30
Electricity rate per kWh (₹)₹8
Electricity consumed240 kWh
Cost₹1,920

Understanding the Electricity Consumption result

Read electricity consumed alongside cost. These describe different parts of the same calculation.

Displayed results use a readable number of decimal places. When checking a result by hand, keep extra precision until the last step. To compare scenarios, change one input at a time and keep the others fixed.

  • Example Cost: ₹1,920

Electricity Consumption Calculator: assumptions and common mistakes

A useful estimate starts with the right inputs. Check the following assumptions and limits before applying the result to your situation.

  • DC, single-phase and three-phase calculations use different relationships. Equipment selection also depends on installation conditions and applicable standards.

For wider guidance, visit Bureau of Indian Standards. The formula and scope of this specific tool are stated on this page.

Electricity Consumption Calculator FAQs

What does Electricity Consumption Calculator calculate?

Electricity Consumption Calculator helps you estimate electrical energy use from wattage, running time and load factor. Its main output is electricity consumed in kWh.

What inputs do I need for Electricity Consumption Calculator?

You need rated power (W), hours switched on per day (hours), average duty / load factor (%), number of days and electricity rate per kWh (₹). Use the field labels and units to match your figures to the formula.

Which formula does Electricity Consumption Calculator use?

Energy = rated watts ÷ 1000 × hours per day × days × average load factor. Cost = energy × entered tariff.

What is a worked example for Electricity Consumption Calculator?

Example inputs: Rated power: 1,000 W; Hours switched on per day: 8 hours; Average duty / load factor: 100 %; Number of days: 30. Keep the remaining inputs as shown in the worked-example table. The result is 240 kWh (electricity consumed).

How should I enter rated power?

Enter rated power in W, at least 0. Decimals are accepted.

How do I choose hours switched on per day?

Enter hours switched on per day in hours, at least 0 and at most 24. Decimals are accepted. The example uses 8 hours; replace it if your circumstances differ.

How should I read electricity consumed?

Read electricity consumed alongside cost. These describe different parts of the same calculation.

Why might my Electricity Consumption Calculator result differ from my records?

DC, single-phase and three-phase calculations use different relationships. Equipment selection also depends on installation conditions and applicable standards. Differences in entered values, units or rounding can also change the comparison.

Can I compare two scenarios in Electricity Consumption Calculator?

Yes. Note your first electricity consumed, change rated power or another input, and select Calculate again. Editing a field clears the old result so it is not mistaken for a new calculation.

Is Electricity Consumption Calculator free, and where are my inputs calculated?

This calculator is free to use without signing in. Its formula runs in your browser; calculator inputs are not sent to a calculation API. The inputs reset to the example values when you reset the form or start a fresh page.