90 is the example result. Read it using the units and relationship stated below.
Electricity Cost uses energy use (kwh), electricity rate per kwh.
Distinguishing electrical arithmetic from equipment selection
For electricity cost, the relationship is Result = [Energy use (kWh)] × [Electricity rate per kWh]. The amount depends on the supplied energy use (kwh), electricity rate per kwh, rather than a live market price or a value imported from another record. Power, energy, voltage and current describe different quantities. Watts represent a rate; watt-hours represent energy over time. Battery and inverter losses can reduce usable runtime even when the rated capacity is unchanged.
What the model includes
Result = [Energy use (kWh)] × [Electricity rate per kWh] Read unit labels before comparing results. Motor estimates depend on phase, efficiency and power factor; energy budgets depend on duration and duty cycle. Nameplate values and measured consumption may differ under real loads. Treat the output as the stated estimate. It does not select a code-compliant conductor, protective device or complete installation. Equipment specifications and applicable requirements remain part of the design decision.
Example with the supplied inputs
Energy use (kWh): 500; Electricity rate per kWh: 0.18. Result: 90. The values are illustrative.
Compare one changed input
Energy use (kWh) changes from 500 to 550. The result becomes 99. All other inputs remain fixed.
Calculation rule
Result = [Energy use (kWh)] × [Electricity rate per kWh]
Inputs and output
| Input | Example value | Entry convention |
|---|---|---|
| Energy use (kWh) | 500 | Measure energy use (kwh) in the displayed unit. Convert the source measurement before entry if it uses another system; a changed label does not perform a unit conversion. |
| Electricity rate per kWh | 0.18 | Measure electricity rate per kwh in the displayed unit. Convert the source measurement before entry if it uses another system; a changed label does not perform a unit conversion. |
Output: 90 is the example result. Read it using the units and relationship stated below. Use the formula to distinguish a cash amount, count, percentage or ratio.
How to use the page
Collect the inputs
Gather Energy use (kWh), Electricity rate per kWh. Use one period and the units shown in the form.
Run the calculation
Enter the values and select the action. The calculation rule above explains how the inputs produce the result.
Compare a scenario
Change Energy use (kWh) on its own, keeping the other inputs fixed. Read both results before changing another assumption.
Worked example
With the example inputs listed above, the result is 90.
Change Energy use (kWh) from 500 to 550 while keeping every other value fixed. The result becomes 99. This comparison isolates that input; it does not forecast how other variables will respond.
Check the stated formula, units and limits before using the result in a decision.
Keep the displayed formula, input units and model scope with the result. Corrections or questions can be sent through the request section on this page.
Content updated: October 11, 2026