24 Watts to Joules
Watts measure power and joules measure energy, so the answer depends on time. Here is what a 24 W device uses over each period.
24 J per second
Because 1 watt = 1 joule per second, 24 W delivers 24 J every second it runs.
- Per minute
- 1,440 J
- Per hour
- 86,400 J
- Per hour (kWh)
- 0.024 kWh
- Per day
- 2,073,600 J
24 watts to joules, explained
A watt is a rate: one watt means one joule of energy is used every second. So 24 watts means 24 joules per second. To get a total number of joules you multiply by how long the power runs.
For example, a 24 W device left on for one hour uses 24 × 3,600 = 86,400 J. Over a full day it uses 2,073,600 J. On an electricity bill, one hour of use is 0.024 kWh.
24 W draws about 40% of the power of an old-style 60 W incandescent bulb. One hour at 24 W consumes 0.024 kWh of electricity — about 0.36¢ at a US average residential rate of $0.15 per kWh.
joules = 24 W × time in seconds24-inch LCD Monitor (24 W)
Standard desktop computer monitors draw around 24 watts during normal brightness operation.
Electrical Power Comparison Scale
Need a different power or time? Use the interactive converter below for any combination.
24 W energy over time
| Time on | Energy (joules) |
|---|---|
| 1 second | 24 J |
| 1 minute | 1,440 J |
| 10 minutes | 14,400 J |
| 1 hour | 86,400 J |
| 6 hours | 518,400 J |
| 1 day | 2,073,600 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: 24 watts
How many joules is 24 watts?
24 watts is not a fixed number of joules on its own — watts measure power and joules measure energy, so you need a time. A 24 W device uses 24 J every second, 86,400 J over one hour (0.024 kWh).
How do you convert 24 watts to joules?
Multiply 24 by the number of seconds the power runs. Joules = 24 × time in seconds. For one hour that is 24 × 3,600 = 86,400 J.
How much energy does a 24 W device use per hour?
A 24 W device running for one hour uses 86,400 J, which is 0.024 kWh on an electricity bill.