Electricity Calculator
Calculate your electricity consumption, cost, and carbon footprint based on appliance usage.
Published by:
isCalculator Editorial Team
Was this calculator helpful?
How to use this tool?
How to Use the Electricity Calculator
- Enter Power Rating (Watts): Input the appliance's power consumption in watts (e.g., 100 for a 100W bulb). Must be a positive number.
- Enter Usage per Day (Hours): How many hours per day the device runs (e.g., 5). Must be a positive number.
- Enter Days per Month: Number of days the device is used in a month (e.g., 30). Accepts 0 to 31.
- Enter Electricity Rate ($/kWh): Your cost per kilowatt-hour (e.g., 0.12 for $0.12/kWh). Must be positive.
- Click "Calculate": The form validates inputs. Results display below:
- Daily Energy (kWh) = Power (W) × Hours ÷ 1000
- Monthly Energy (kWh) = Daily Energy × Days
- Monthly Cost ($) = Monthly Energy × Rate
- Carbon Footprint (kg CO₂) = Monthly Energy × 0.92 (average emission factor)
All inputs must be positive numbers. Use the "Reset" button or refresh to start over.
Previous Results
| Result | Inputs | Date |
|---|
Frequently Asked Questions
Multiply the power rating of your appliance (in watts) by the number of hours used per day, then divide by 1000 to get daily kWh. Multiply by days per month for monthly consumption.
Electricity rates vary by location. In the US, the average residential rate is around $0.12 per kWh. Check your utility bill for your exact rate.
We use an average emission factor of 0.92 kg CO2 per kWh, which is typical for the US grid. Your actual footprint may vary based on your energy source.