When to use this calculator
Calculate energy charges from consumption and a manually entered unit rate. Excludes standing charges and other fees unless included separately.
Explore the electricity use & bills calculators for other questions in this topic. For a related calculation, use the Energy Payback Calculator: Estimate simple payback time for an efficiency upgrade.
PUTTING IT INTO PRACTICE
Electricity Cost: a worked example
The values below are an illustrative example, not a recommendation. Replace them with measurements or assumptions that match your question.
| Input | Example value |
|---|---|
| Energy used (kWh) | 300 |
| Price per kWh | 0.3 |
| Result | 90 currency units |
- Check the input labels and enter the example values above.
- Apply the relationship: Cost = energy × unit price.
- The result is 90 currency units, rounded for display.
How to interpret your result
Excludes standing charges and other fees unless included separately.
Watts describe power and kilowatt-hours describe energy. Fixed charges do not vary directly with consumption. Devices with thermostats or cycling loads need measured average energy or realistic operating time.
Frequently asked questions
Can I multiply rated watts by 24 hours for every appliance?
Only if it actually draws that power continuously. Cycling and variable-power appliances require a better average-use estimate.
How do I use the electricity cost calculator?
Enter energy used (kwh), price per kwh. The result updates automatically. Use the units shown beside each input; the example values illustrate the method.
Which formula does this calculator use?
Cost = energy × unit price.
What should I check before using the result?
Excludes standing charges and other fees unless included separately.
How are results rounded?
Scalar numbers display up to six decimal places, with scientific notation for very large or small values. Text, fraction, date and schedule outputs use the format described on the tool. Intermediate calculations use JavaScript floating-point arithmetic. Keep sensible precision for your measurements.
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