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Phone battery
40 kJ
Laptop full charge
200 kJ
AA battery
10 kJ
Slice of bread
330 kJ
Cup of coffee
5 kJ
100 W bulb for 1 hour
0.1 kWh
Frequently Asked Questions
How much is 311 kilojoules in joules?
311 kilojoules equals 311000 joules.
How many joules is 1 kilojoule?
1 kilojoule equals 1000 joules.
How many kilojoules is 1 joule?
1 joule equals 0.001 kilojoules.
What is the difference between kilojoules 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 kilojoules 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 kilojoule equal 1000 joules?
Because the “kilo-” prefix means 1000. One kilojoule equals 1000 joules.