Free Watts to Watt-Hours Calculator — Convert W to Wh instantly. Perfect for home appliances, batteries, electronics, electric vehicles, and solar energy systems.
Please enter valid values. Both fields must be greater than zero.
Formula: Watt-Hours = Watts × Hours
Watts to Watt-Hours: The Complete Conversion Guide
What Is the Difference Between Watts and Watt-Hours?
Watts (W) measure the rate of power consumption or production at any given moment. Watt-Hours (Wh) measure the total amount of energy consumed or produced over a period of time.
Think of it this way — Watts are like the speed of a car, while Watt-Hours are the total distance traveled.
The Formula
Watt-Hours (Wh) = Watts (W) × Hours (h)
Example: A 100W light bulb running for 5 hours consumes: 100W × 5 hours = 500Wh
Practical Applications
Home Appliances: A 1500W air conditioner running for 3 hours consumes: 1500W × 3 = 4500Wh (4.5 kWh)
Battery Sizing: To store enough energy for a 200W device running 6 hours, you need: 200W × 6 = 1200Wh battery capacity
Solar Panels: A 300W solar panel producing power for 5 peak sun hours generates: 300W × 5 = 1500Wh per day
Electric Vehicles: A 50W device running for 10 hours in an RV or EV, power consumption: 50W × 10 = 500Wh
Quick Reference Conversion Table
| Power (W) | Duration | Energy (Wh) | Application |
|---|---|---|---|
| 5W | 10 Hours | 50Wh | Solar Garden Light |
| 50W | 5 Hours | 250Wh | LED TV / Fan |
| 100W | 8 Hours | 800Wh | Home Appliance |
| 200W | 6 Hours | 1200Wh | Battery Backup |
| 300W | 5 Hours | 1500Wh | Solar Panel Daily Output |
| 500W | 4 Hours | 2000Wh | Portable Power Station |
| 1000W | 3 Hours | 3000Wh | Heavy Electrical Load |
Frequently Asked Questions
Can I convert Watts to Watt-Hours without knowing the time?
No. You must know the time duration because Watt-Hours depend on both power and time. Without hours, the conversion is not possible.
What is the difference between Wh and kWh?
1 kWh = 1000 Wh. Electricity companies bill you in kWh. Example: 3000Wh = 3 kWh.
How do I calculate how long my battery will last?
Use the reverse formula: Hours = Watt-Hours ÷ Watts. Example: A 500Wh battery running a 50W device: 500 ÷ 50 = 10 hours runtime.
Also, check our related calculator:
Watt-Hours to Watts Calculator
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