Joules to Watts Calculator
Convert between energy (Joules) and power (Watts) using time as the conversion factor
1 Watt = 1 Joule per second (1 W = 1 J/s)
Conversion Formula
Watts (W) = Joules (J) / Time (s)
Joules (J) = Watts (W) × Time (s)
Seconds (s)
Common Conversions (at 1 second)
1 J → Watts
1.0 J = 1.0 W
100 J → Watts
100.0 J = 100.0 W
1 W → Joules
1.0 W = 1.0 J
50 W → Joules (10s)
50.0 W = 500.0 J
1 kJ → Watts
1,000 J = 1,000 W
0.5 W → Joules (30s)
0.5 W = 15.0 J
What is a Joule (J)?
The joule is the SI unit of energy, work, and heat. It is defined as the energy transferred when a force of one newton acts through a distance of one meter. Key facts:
- 1 J = 1 N·m = 1 W·s
- Used to measure energy in all forms (mechanical, electrical, thermal)
- Submultiples: mJ, µJ | Multiples: kJ, MJ, GJ
- Common in physics, engineering, and everyday applications
What is a Watt (W)?
The watt is the SI unit of power, defined as the rate of energy transfer or conversion. It represents one joule of energy per second. Key facts:
- 1 W = 1 J/s = 1 V·A
- Named after Scottish inventor James Watt
- Used to measure power consumption of electrical devices
- Multiples: kW, MW, GW (common for power plants)
Usage Tips & Notes
Time is critical - power is energy per unit time
Use seconds for time input (convert minutes/hours first)
Joules measure energy, Watts measure power (rate of energy use)
For example: 1000 J used over 10s = 100 W power
Common for electrical devices, appliances, and energy calculations
1 kilowatt-hour (kWh) = 3.6 × 10⁶ Joules