1,200 Watts to Joules
Watts measure power and joules measure energy, so the answer depends on time. Here is what a 1200 W device uses over each period.
1,200 J per second
Because 1 watt = 1 joule per second, 1200 W delivers 1,200 J every second it runs.
- Per minute
- 72,000 J
- Per hour
- 4,320,000 J
- Per hour (kWh)
- 1.2 kWh
- Per day
- 103,680,000 J
1200 watts to joules, explained
A watt is a rate: one watt means one joule of energy is used every second. So 1200 watts means 1200 joules per second. To get a total number of joules you multiply by how long the power runs.
For example, a 1200 W device left on for one hour uses 1200 × 3,600 = 4,320,000 J. Over a full day it uses 103,680,000 J. On an electricity bill, one hour of use is 1.2 kWh.
1,200 W draws about the same power as 20 old-style 60 W incandescent bulbs running at once. One hour at 1,200 W consumes 1.2 kWh of electricity — about $0.180 at a US average residential rate of $0.15 per kWh.
joules = 1200 W × time in secondsTwo-slice toaster (1,200 W)
A two-slice electric toaster draws about 1,200 watts of resistive heat to brown bread.
Electrical Power Comparison Scale
Need a different power or time? Use the interactive converter below for any combination.
1200 W energy over time
| Time on | Energy (joules) |
|---|---|
| 1 second | 1,200 J |
| 1 minute | 72,000 J |
| 10 minutes | 720,000 J |
| 1 hour | 4,320,000 J |
| 6 hours | 25,920,000 J |
| 1 day | 103,680,000 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.
FAQ: 1200 watts
How many joules is 1200 watts?
1200 watts is not a fixed number of joules on its own — watts measure power and joules measure energy, so you need a time. A 1200 W device uses 1,200 J every second, 4,320,000 J over one hour (1.2 kWh).
How do you convert 1200 watts to joules?
Multiply 1200 by the number of seconds the power runs. Joules = 1200 × time in seconds. For one hour that is 1200 × 3,600 = 4,320,000 J.
How much energy does a 1200 W device use per hour?
A 1200 W device running for one hour uses 4,320,000 J, which is 1.2 kWh on an electricity bill.