Electricity Calculator
Calculate electricity costs, kilowatt-hours, and energy consumption for devices.
Electricity Calculator
Calculate electricity costs, kilowatt-hours, and energy consumption for devices.
Engineering Calculation
ℹ️ Used for basic engineering ratio and product calculations
Disclaimer
Results provided by this calculator are for informational and educational purposes only. They are based on the values you enter and standard formulas, and should not be considered financial, medical, legal, or professional advice. Always consult a qualified professional before making important decisions based on these results. Roughtools makes no warranties regarding the accuracy or completeness of these calculations for your specific situation.
Frequently Asked Questions
Pro Tips
Always verify critical calculations with a second method or source — for important decisions, this tool provides a starting point, not a final answer.
Input accuracy determines output accuracy. Use precise values rather than rough estimates for the most useful results.
Run the calculation multiple times with slightly different inputs to understand the sensitivity of the result to your assumptions.
For professional, financial, medical, or legal decisions, always confirm results with a qualified professional before acting.
When to Use This Calculator
Use the Electricity Calculator for fast, accurate calculations without installing any software.
Understand the formula and see how changing inputs affects the result for educational purposes.
Get a quick estimate before performing more detailed analysis or consulting a professional.
Accessible from any device — no app to install, no account required, works offline after loading.
Run multiple scenarios quickly by changing one input at a time to understand sensitivities.
About the Electricity Calculator
This electricity calculator estimates the energy consumption (kilowatt-hours) and electricity cost of any household appliance or device based on its power rating (watts), daily usage hours, and your electricity rate (cents per kWh). Enter multiple appliances to see total household energy use and monthly electricity cost. Built for homeowners reducing their electricity bill, renters comparing energy costs, and anyone sizing a solar panel system or generator.
How to Use the Electricity Calculator
- 1
Enter the appliance name and its power rating in watts (found on the label or spec sheet).
- 2
Enter the average number of hours per day the appliance runs.
- 3
Enter your electricity rate in cents per kWh (found on your electricity bill).
- 4
See daily kWh, monthly kWh, and monthly cost for each appliance.
- 5
Add multiple appliances to see total household energy consumption and cost.
Related Calculators
View all →BTU Calculator
Calculate BTUs needed to heat or cool a room based on size and climate.
Voltage Drop Calculator
Calculate voltage drop in electrical wire runs for any circuit length and load.
Ohms Law Calculator
Calculate voltage, current, resistance, or power using Ohm's Law.
Budget Calculator
Build a monthly budget and track income vs. expenses by category.
Your input is processed locally in your browser and is never stored, transmitted, or shared with any server. See our Privacy Policy.