KWH Calculator – Calculate Energy Usage in Kilowatt-Hours
The kWh Calculator helps you calculate energy consumption in kilowatt-hours and estimate the electricity cost for appliances or devices. Perfect for tracking usage at home, in offices, or during energy audits.
How to Use the kWh Calculator
Enter the following details:
- Power rating in watts (W) or kilowatts (kW)
- Number of hours used per day
- Number of days
- Optional: Cost per kWh (your electricity rate)
The calculator will give:
- Total energy used in kilowatt-hours (kWh)
- Estimated electricity cost
kWh Calculation Formula
kWh = (Watts × Hours × Days) ÷ 1000
Cost = kWh × Rate per kWh
Example
Device: Air Conditioner (1500W), used 5 hours daily for 30 days
→ kWh = (1500 × 5 × 30) ÷ 1000 = 225 kWh
Electricity Rate: $0.12/kWh
→ Cost = 225 × 0.12 = $27.00
Common Use Cases
- Home appliance energy tracking
- Reducing power consumption
- Estimating monthly electricity bills
- Comparing energy efficiency between devices
- Solar power system sizing
Why Use a kWh Calculator?
Understanding your power consumption helps you save on electricity bills, choose energy-efficient devices, and manage sustainable energy use. This calculator is quick and accurate for daily or monthly planning.
Frequently Asked Questions (FAQs)
What is a kilowatt-hour?
It is a measure of energy equal to using 1,000 watts for 1 hour (1 kWh = 1000 watts × 1 hour).
How do I find my electricity rate?
Your rate is usually printed on your electricity bill, expressed as cost per kWh (e.g., $0.12/kWh).
How do I reduce kWh usage?
Use energy-efficient appliances, unplug idle electronics, and minimize usage hours.
Does this tool support multiple devices?
Yes, you can calculate separately and sum up the kWh values for total consumption.
What’s the difference between watts and kWh?
Watts measure power, kWh measures energy over time. kWh = Watts × Time ÷ 1000.