Two figures in, a clear answer out. The electricity cost calculator uses power consumption, energy price and usage time to produce power consumed and cost, applying the standard relationship for this problem in the order the calculation actually needs it.
What Is the Electricity Cost Calculator?
The electricity cost calculator turns power consumption, energy price and usage time into power consumed and cost.
It is a quick way to get from the numbers you have to the number you need, without setting up a spreadsheet or reaching for a formula.
How the Electricity Cost Works
Each result follows from the ones before it, and the calculator shows every step, so a surprising answer can be traced back to the input that caused it.
Round your inputs to the precision you actually know, and keep more precision than that in the intermediate steps.
Getting a Result You Can Trust
Run the calculation twice with slightly different inputs. A sensible calculator moves its output in proportion; a wild change points to a unit or a decimal point problem in what you entered.
Write the inputs down next to the answer. It takes a moment and it is the difference between a number you can explain and one you cannot.
A Worked Example
Working through an example, with power consumption set to 10, energy price set to 5, usage time set to 2, the calculator returns power consumed of 20, and cost of 100. Substitute your own figures and the same steps produce the same kind of answer.
Frequently Asked Questions
What do I need to work out power consumed?
Enter power consumption, energy price and usage time. The calculator then works through the relationship and reports power consumed and cost.
What does the electricity cost actually calculate?
It takes power consumption, energy price and usage time and converts them into power consumed and cost using the standard relationship for this problem. Each step is applied in turn, so every output is traceable back to the numbers you typed in.
How should I enter power consumption?
Use the value you actually have, in the unit shown next to the field. Enter every value in the same unit system. The calculator assumes the figures you supply are consistent, so it cannot correct a mistake that happens before the calculation starts.
Why does a small change in one value move the answer so much?
That happens when an output depends on a ratio, because dividing by a small number magnifies any change in it. Check the units first, then check whether the value you entered is in the range the relationship was designed for.
Is the answer exact?
It is as exact as the formula and the inputs allow. The method itself is the standard one for this problem, so the only sources of error are the figures you enter and the precision you ask for.