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Common Benchmarks
Match stick
1 kJ
100 W bulb for 1 hour
0.1 kWh
Gasoline liter
34 MJ
Laptop full charge
200 kJ
Phone battery
40 kJ
Microwave 10 minutes
0.17 kWh
Formula
J = Wh × 3600
Example
Example: convert 12 watt-hours to joules.
12 Wh = 43200 J
Conversion table
| watt-hours (Wh) | joules (J) |
|---|---|
| 1 Wh | 3600 J |
| 2 Wh | 7200 J |
| 5 Wh | 18000 J |
| 10 Wh | 36000 J |
| 20 Wh | 72000 J |
| 50 Wh | 180000 J |
| 100 Wh | 360000 J |
Explanation
These are both units.
How to convert watt-hours to joules
- Start with the value in watt-hours (Wh).
- Multiply it by 3600.
- The result is the measurement in joules (J).
Example: 12 Wh → 43200 J
Frequently Asked Questions
How much is 12 watt-hours in joules?
12 watt-hours equals 43200 joules.
How many joules is 1 watt-hour?
1 watt-hour equals 3600 joules.
How many watt-hours is 1 joule?
1 joule equals 0.000277777778 watt-hours.
What is the difference between watt-hours and joules?
Both measure energy in SI. The main difference is usually scale: some units are convenient for smaller values, while others are used to express larger values more practically.
Where are watt-hours and joules used?
They are used in physics and engineering to measure work, energy, and heat; the most practical unit depends on the magnitude.
Why does 1 watt-hour equal 3600 joules?
Because the units are defined with a fixed relationship. To convert watt-hours to joules, multiply by that factor.