Cost Electricity Calculator
Electricity Energy Cost Calculator works out Energy used and Cost from Power, Power in watts and Hours of use. The default figures on this page give cost of 2; change any entry and the result, the working and the sources update together.
Your figures
Updates as you typeHow this is worked out
2 steps
- Energy = 1 kW x 10 h = 10 kWh
- Cost = 10 kWh x 0.2 = 2
Its 5 worked examples are re-run on every release, last on 15 September 2026. What changed
Sources and references
2 sources
What the Electricity Energy Cost Calculator calculates
Works out the energy an appliance consumes over a period and what it costs at a given tariff, in kilowatt-hours.
How to use this Electricity Energy Cost Calculator
Enter Power, Power in watts, Hours of use and Energy used. Energy used updates as you type, and “Use a worked example” loads checked figures you can adjust. Change one figure at a time to see what drives the result.
How the result is worked out
Open “How this is worked out” beside the result for the step-by-step calculation behind Energy used, Cost and Power.
The method follows Energy in kilowatt-hours is power in kilowatts multiplied by hours of use; cost is energy multiplied by the unit tariff. and IEC 60050, International Electrotechnical Vocabulary.
Research R975-GT-1: 1 kW for 10 hours at 0.20 example
With Power: 1, Hours of use: 10, Tariff per kWh: 0.2, the calculator returns Energy used: 10, Cost: 2. This example is checked against an independent source in the test suite.
What you can compare
Change one input at a time to see how it affects Energy used, Cost and Power. The inputs you can vary are Power, Power in watts, Hours of use, Energy used, Tariff per kWh and Price per kWh.
Results are general information, not financial, tax, legal, medical or engineering advice. Check any decision that matters with a qualified professional.
See something wrong? Report a problem with this calculator
Frequently asked questions
How do I calculate my electricity cost?
Works out the energy an appliance consumes over a period and what it costs at a given tariff, in kilowatt-hours. Open “How this is worked out” beside the result to see each step for your own figures.
How much electricity should a 2000 sq ft house use?
On the figures this page opens with — power 1 kW, hours of use 10 and tariff per kWh 0.2 — the cost is 2. No single number fits everyone: change any figure above and the answer updates as you type, with each step of the arithmetic beside it.
What do 1000 units of electricity cost?
Works out the energy an appliance consumes over a period and what it costs at a given tariff, in kilowatt-hours. On this page it is computed from Power, Power in watts and Hours of use and shown as Energy used, Cost and Power.
What information do I need for the Electricity Energy Cost Calculator?
You need Power, Power in watts, Hours of use, Energy used, Tariff per kWh, Price per kWh and Days in the billing period. The page opens with default figures that give cost of 2, so you can see the scale before entering your own.
What does this Electricity Energy Cost Calculator show?
It shows Energy used, Cost, Power, Energy over the period and Cost over the period, with the working and any warnings for your entries.
Can I check how the Electricity Energy Cost Calculator result was calculated?
Yes. The “How this is worked out” section shows the calculation steps, and the sources section identifies the references used for the method.