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Common Benchmarks
Phone battery
40 kJ
Slice of bread
330 kJ
100 W bulb for 1 hour
0.1 kWh
Match stick
1 kJ
Gasoline liter
34 MJ
AA battery
10 kJ
Frequently Asked Questions
How much is 5 joules in calories?
5 joules is about 1.195029 calories.
How many calories is 1 joule?
1 joule equals 0.239005736138 calories.
How many joules is 1 calorie?
1 calorie equals 4.184 joules.
What is the difference between joules and calories?
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 joules and calories 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 joule equal 0.239005736138 calories?
Because the units are defined with a fixed relationship. To convert joules to calories, multiply by that factor.