1,000 Watts to Joules
Watts measure power and joules measure energy, so the answer depends on time. Here is what a 1000 W device uses over each period.
1,000 J per second
Because 1 watt = 1 joule per second, 1000 W delivers 1,000 J every second it runs.
- Per minute
- 60,000 J
- Per hour
- 3,600,000 J
- Per hour (kWh)
- 1 kWh
- Per day
- 86,400,000 J
1000 watts to joules, explained
A watt is a rate: one watt means one joule of energy is used every second. So 1000 watts means 1000 joules per second. To get a total number of joules you multiply by how long the power runs.
For example, a 1000 W device left on for one hour uses 1000 × 3,600 = 3,600,000 J. Over a full day it uses 86,400,000 J. On an electricity bill, one hour of use is 1 kWh.
joules = 1000 W × time in secondsNeed a different power or time? Use the interactive converter below for any combination.
1000 W energy over time
| Time on | Energy (joules) |
|---|---|
| 1 second | 1,000 J |
| 1 minute | 60,000 J |
| 10 minutes | 600,000 J |
| 1 hour | 3,600,000 J |
| 6 hours | 21,600,000 J |
| 1 day | 86,400,000 J |
Convert any wattage and time
The full Watts to Joules converter handles W, kW, MW, any time unit, and the reverse joules→watts and time calculations.
Frequently asked questions
How many joules is 1000 watts?
1000 watts is not a fixed number of joules on its own — watts measure power and joules measure energy, so you need a time. A 1000 W device uses 1,000 J every second, 3,600,000 J over one hour (1 kWh).
How do you convert 1000 watts to joules?
Multiply 1000 by the number of seconds the power runs. Joules = 1000 × time in seconds. For one hour that is 1000 × 3,600 = 3,600,000 J.
How much energy does a 1000 W device use per hour?
A 1000 W device running for one hour uses 3,600,000 J, which is 1 kWh on an electricity bill.