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Use our free Power to Energy Calculator to find energy from power and time in seconds. Quick, accurate, and simple tool for students and engineers.
Ever wondered how much energy your devices use? Our Power to Energy Calculator makes it super easy to find out. Whether you’re checking a light bulb’s usage or a machine’s power draw, this tool helps you calculate energy from power and time in seconds.
We designed this calculator for students, engineers, and curious learners who want fast and accurate results without any complex math.
Power tells you how fast energy is used or produced, while energy tells you how much total work is done.
Think of it like this if power is the “speed” of your car, then energy is the “distance” you’ve traveled. The longer your device runs, the more energy it consumes.
The simple formula connects them:
Energy = Power × Time
This is the heart of all power-to-energy conversions.
The calculation follows this easy physics rule:
E = P × t
Where:
If power or time are in different units, you can convert them first.
For example:
1 kilowatt (kW) = 1000 watts (W)
1 hour (h) = 3600 seconds (s)
So, if you run a 2 kW heater for 3 hours, your energy use is:
E = 2 kW × 3 h = 6 kWh
To see it in Joules:
6 kWh × 3,600,000 = 21,600,000 J
That’s how simple it is!
You don’t need to do any math. Just follow these steps:
Step 1
Enter the power value, like 1500 or 2.5.
Step 2
Select your power unit W, kW, MW, or even horsepower.
Step 3
Enter the time your device runs, for example, 2 hours or 45 minutes.
Step 4
Choose your preferred energy unit, like Joules (J) or kilowatt-hours (kWh).
Step 5
Click the calculate button, and you’ll instantly get your energy result along with a detailed step-by-step breakdown.
Let’s take an example:
Power = 100 W
Time = 5 hours
Convert 5 hours to seconds: 5 × 3600 = 18,000 seconds
Now multiply:
E = 100 × 18,000 = 1,800,000 J
In kWh:
1,800,000 × (1 ÷ 3,600,000) = 0.5 kWh
So, running a 100-watt bulb for 5 hours uses 0.5 kWh of energy.
You’ll love how simple and clear it is. The calculator automatically handles unit conversions and gives you clean results every time. It’s perfect for:
This tool is designed to save time and help you focus on learning or designing not on confusing math.
The Power to Energy Calculator is your handy physics assistant. It converts power and time into energy in just one click. The formula behind it, E = P × t, works across all types of power systems electric, mechanical, or thermal.
Whether you’re a student working on assignments or an engineer calculating system loads, this calculator will make your job easier, faster, and more accurate.
The formula is simple: Energy = Power × Time. Multiply your power value by the time the system operates.
Multiply watts (W) by seconds (s). One watt for one second equals one joule.
Yes, if you use kilowatts and hours, the result will be in kilowatt-hours (kWh), which is the common unit used by electric companies.
Power is the rate of using energy. Energy is the total amount used over time.
Yes, it supports horsepower (hp). It automatically converts it into watts before calculating energy.