Convert energy to power using this online calculator. Enter joules (J) and the time duration in seconds (s) to get watts (W), the rate of energy use per second.
Joules (J) to Watts (W) Converter
Enter energy in joules and time in seconds to calculate power in watts.
Energy (Joules)
Time (Seconds)
Result in Watts (W)
How to Use This Tool
- Input the amount of energy in the “Joules” field (e.g., 1000).
- Enter the time over which the energy is used in the “Seconds” field (e.g., 10).
- Click the “Convert” button to calculate watts (J ÷ s).
- The result will appear in the “Watts” field.
- Click “Copy Result” to copy the output to your clipboard.
- Use “Clear All” to reset all fields to default.
- Adjust the “Decimal Places” field to control precision (0–10).
- The “Swap” button takes you to the reverse version: Watts to Joules.
Definitions of Measurement Units
Joule (J)
A joule is the SI unit of energy. It is defined as the work done when one newton of force moves an object one meter. 1 joule = 1 newton·meter = 1 watt·second. Common in physics and engineering, it quantifies energy used or transferred.
Watt (W)
A watt is the SI unit of power, representing the rate of energy use. 1 watt = 1 joule per second. It measures how fast energy flows, commonly used in electrical devices (e.g., a 60 W light bulb consumes 60 joules per second).
Conversion Formula
To convert joules to watts, divide the energy in joules by the time in seconds.
Watts = Joules ÷ Seconds
Source: Encyclopaedia Britannica – Watt | Unit of Power
Real World Examples
- Phone charging (fast): 5400 J over 60 s = 90 W
- LED bulb: 600 J over 60 s = 10 W
- Electric kettle: 90000 J over 60 s = 1500 W
- Microwave heating 1 cup water: 63000 J over 60 s = 1050 W
- Running 1 HP motor: 74570 J over 1 s = 745.7 W
- Hair dryer (typical): 144000 J over 60 s = 2400 W
- Gaming laptop peak power: 72000 J over 60 s = 1200 W
- Toaster: 60000 J over 60 s = 1000 W
- Compact fridge compressor: 18000 J over 60 s = 300 W
- Electric blanket (low setting): 7200 J over 60 s = 120 W
Conversion Table (Joules to Watts)
| Joules (J) | Seconds (s) | Watts (W) |
| 10 | 1 | 10 |
| 100 | 2 | 50 |
| 500 | 10 | 50 |
| 1000 | 10 | 100 |
| 1500 | 10 | 150 |
| 2000 | 20 | 100 |
| 2500 | 25 | 100 |
| 3000 | 30 | 100 |
| 3600 | 60 | 60 |
| 5000 | 100 | 50 |
| 6000 | 60 | 100 |
| 7200 | 60 | 120 |
| 10000 | 100 | 100 |
| 12000 | 60 | 200 |
| 15000 | 75 | 200 |
| 18000 | 60 | 300 |
| 20000 | 100 | 200 |
| 25000 | 100 | 250 |
| 30000 | 100 | 300 |
| 36000 | 60 | 600 |
What are you calculating today? Let us know your scenario or request new features in the comments section.
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