How to use the electricity cost calculator
Estimate energy use and running cost of an appliance. Enter power, hours per day, days, price per kwh in the fields above; the energy used, cost are computed instantly and plotted on the chart so you can see how the answer changes.
Formula
Variables
- P — Power (W)
- h — Hours per day (h)
- d — Days (days)
- c — Price per kWh ($)
Worked example
With power = 1500 W, hours per day = 3 h, days = 30 days, price per kwh = 0.15 $, the calculator gives energy used ≈ 135 kWh; cost ≈ 20.25 $.
Frequently asked questions
What is the formula for the electricity cost calculation?
Energy used (kWh) = P / 1000 × h × d. Cost ($) = [Energy used] × c. Here P is power (W), h is hours per day (h), d is days (days), c is price per kwh ($).
What inputs do I need for the electricity cost calculator?
You need power in W, hours per day in h, days in days, price per kwh in $. Each field is pre-filled with a typical example so you can see how the result responds as you edit the numbers.
How do I use this calculator?
Type values into the input fields. Results and the chart update instantly. Use Reset to restore the example values, Copy results to paste them elsewhere, or Share to copy a link that preserves your inputs.
Is the result exact?
Calculations use standard formulas and double-precision arithmetic, then display about seven significant figures. Real-world measurements carry uncertainty, so treat results as estimates unless your inputs are exact.