# Electricity Cost

> Estimate the electricity cost of running appliances based on their wattage and usage time.

Page: https://askcalculators.com/calculator/electricity-calculator/
Definition: https://askcalculators.com/calculator/electricity-calculator/definition.json
JSON Schema: https://askcalculators.com/calculator/electricity-calculator/schema.json
Version: 7.0.0
Maintained by: AskCalculators (software project; not a credentialed reviewer)
Qualified review: pending. Automated checks do not establish professional approval.
Page status: Live
Review status: Pending

## Use
Open the calculator page and enter values. Query-string parameters can restore and bookmark a calculation.
Example: https://askcalculators.com/calculator/electricity-calculator/?watts=100&hours=5&rate=0.15

## Inputs
- watts: Power Consumption (Watts); type=number; optional; default=100
- hours: Hours Used Per Day; type=number; optional; default=5
- rate: Cost per kWh ($); type=number; optional; default=0.15

## Outputs
- result: Result; format=text; primary

## Formula
Energy in kWh = power in kW × hours; cost = energy × price per kWh.

## Rules
- Empty optional inputs are undefined, not zero.
- Hidden conditional inputs are ignored.
- Do not invent missing required inputs.