Watts to Joules Calculator
Calculate the total energy (Joules) expended given a specific amount of power (Watts) and time (Seconds).
Power & Time
Total Energy Formed
How to Convert Watts to Joules
In physics, Power (Watts) is defined as the rate at which Energy (Joules) is generated or consumed. Therefore, 1 Watt is equal to 1 Joule per Second (1 W = 1 J/s).
- Formula:
Energy (Joules) = Power (Watts) × Time (Seconds) - Example: A 100W lightbulb left on for 10 seconds expends 1,000 Joules of energy (100 W × 10 s = 1,000 J).
Physics Calculator FAQ
How do I convert Joules back to Watts?
To convert energy (Joules) back into power (Watts), you simply reverse the formula by dividing the Joules by the time in seconds. Formula: Watts = Joules / Seconds.
Does time have to be in seconds?
Yes. In the International System of Units (SI), a Joule is strictly defined by the second. If your time measurement is in minutes or hours, you must first convert that time into seconds before multiplying it by the Wattage.
What is a Kilojoule (kJ)?
A Kilojoule is simply 1,000 Joules. Given how small a single Joule of energy is (it is roughly the energy required to lift a small apple one meter into the air), calculations involving large motors or diets usually group them into thousands.