# Electricity Cost Calculator

> Estimate energy use and electricity cost for one or more devices.

Page: https://askcalculators.com/calculator/electricity-cost-calculator/
Definition: https://askcalculators.com/calculator/electricity-cost-calculator/definition.json
JSON Schema: https://askcalculators.com/calculator/electricity-cost-calculator/schema.json
Version: 1.0.0
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-cost-calculator/?powerWatts=1000&devices=1&hoursPerDay=4&days=30&ratePerKwh=0.18

## Inputs
- powerWatts: Power per device; type=number; required; default=1000; min=0
- devices: Number of devices; type=number; required; default=1; min=1; max=1000000
- hoursPerDay: Hours used per day; type=number; required; default=4; min=0; max=24
- days: Days; type=number; required; default=30; min=0; max=36500
- ratePerKwh: Electricity rate per kWh; type=money; required; default=0.18; min=0

## Outputs
- totalCost: Total electricity cost; format=currency; primary
- energyKwh: Energy used; format=number
- dailyCost: Average daily cost; format=currency
- annualizedCost: Annualized cost at same use; format=currency

## Formula
Energy (kWh) = watts ÷ 1000 × devices × hours/day × days; cost = energy × rate

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