Electricity Calculator
Calculate electricity cost and energy consumption
Enter Electricity Details
Check appliance label or specifications
Number of hours the device is used
Check your electricity bill (typically $0.10-$0.20/kWh)
Electricity Cost Result
About This Calculator
The Electricity Calculator helps you calculate electricity costs and energy consumption based on power usage, time, and electricity rates. It's useful for estimating energy costs for appliances, devices, and overall electricity usage.
This tool is essential for homeowners, businesses, and anyone who wants to understand their electricity consumption and costs. The calculator converts power (watts) to energy (kilowatt-hours) and calculates costs based on your electricity rate.
Formula & Calculation Method
Electricity calculations use the following formulas:
- Power (kW): Power (W) / 1000
- Energy (kWh): Power (kW) × Time (hours)
- Cost: Energy (kWh) × Rate ($/kWh)
- Daily Cost: Power (kW) × 24 hours × Rate ($/kWh)
- Monthly Cost: Power (kW) × 24 hours × 30 days × Rate ($/kWh)
- Yearly Cost: Power (kW) × 24 hours × 365 days × Rate ($/kWh)
Where:
- Power is measured in watts (W) or kilowatts (kW)
- Energy is measured in kilowatt-hours (kWh)
- Rate is the cost per kilowatt-hour in dollars
- 1 kW = 1,000 W
- 1 kWh = 1 kW used for 1 hour
How to Use This Calculator
Frequently Asked Questions
How do I find my electricity rate?
Your electricity rate is listed on your electricity bill, usually shown as "$/kWh" (dollars per kilowatt-hour). Rates typically range from $0.10 to $0.20 per kWh in the US, but can vary by location and time of use.
What is the difference between watts and kilowatt-hours?
Watts (W) measure power (rate of energy use), while kilowatt-hours (kWh) measure energy (total amount used). For example, a 100W light bulb uses 100 watts of power. If left on for 10 hours, it uses 1 kWh of energy (100W × 10h = 1,000 Wh = 1 kWh).
How can I reduce my electricity costs?
To reduce electricity costs, use energy-efficient appliances (look for ENERGY STAR ratings), turn off devices when not in use, use LED light bulbs, adjust thermostat settings, and consider using appliances during off-peak hours if your utility offers time-of-use rates.
What is a typical power consumption for common appliances?
Common power consumption: LED light bulb (10-15W), refrigerator (100-200W), laptop (50-100W), desktop computer (200-400W), washing machine (500-1500W), air conditioner (1000-5000W), electric water heater (4000-5500W).
NumCalculators Editorial Team
Multi-disciplinary Expert Team
The NumCalculators Editorial Team consists of subject matter experts across various fields who review and verify the accuracy of our calculators. Each calculator undergoes rigorous testing and validation before publication.