A microjoule (uJ) is a metric-prefixed unit of energy equal to 10-6 joules, a fraction of a single joule, using the SI micro prefix.
Microjoules to Kilocalories
Convert Microjoule (uJ) to Kilocalorie (kcal) instantly with an exact formula, conversion table, and FAQ.
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Convert microjoules (uJ) to kilocalories (kcal) instantly with formula, conversion table, and FAQ.
Context values
Some unit families need one extra value for a physically accurate result.
A kilocalorie (kcal) equals 1,000 small calories and is the unit behind the food "Calorie" shown on nutrition labels.
kcal = uJ × 2.390057361e-10
Results update instantly for Microjoules to Kilocalories conversions.
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Formula
kcal = uJ × 2.390057361e-10
uJ = kcal × 4184000000
Conversion table
| 1 uJ | 2.390057e-10 kcal |
| 5 uJ | 1.195029e-09 kcal |
| 10 uJ | 2.390057e-09 kcal |
| 20 uJ | 4.780115e-09 kcal |
| 50 uJ | 1.195029e-08 kcal |
| 100 uJ | 2.390057e-08 kcal |
| 500 uJ | 1.195029e-07 kcal |
| 1000 uJ | 2.390057e-07 kcal |
Related conversions
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How the formula works
Both microjoule and kilocalorie measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in microjoules by 2.390057361e-10 to get kilocalories. To reverse the conversion, multiply a kilocalorie value by 4184000000 to get back to microjoules.
Frequently asked questions
What is Microjoule (uJ)?
A microjoule (uJ) is a metric-prefixed unit of energy equal to 10-6 joules, a fraction of a single joule, using the SI micro prefix.
What is Kilocalorie (kcal)?
A kilocalorie (kcal) equals 1,000 small calories and is the unit behind the food "Calorie" shown on nutrition labels.
How do I convert microjoules to kilocalories?
Multiply the microjoule value by 2.390057361e-10 to get the equivalent in kilocalories. For example, 5 uJ × 2.390057361e-10 = 1.195029e-09 kcal.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 2.390057361e-10 is an exact, non-rounded value.
Can I convert kilocalories back to microjoules?
Yes. Divide the kilocalorie value by 2.390057361e-10, or multiply it by 4184000000, to get microjoules.
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About converting microjoules to kilocalories
A microjoule (uJ) is a metric-prefixed unit of energy equal to 10-6 joules, a fraction of a single joule, using the SI micro prefix. A kilocalorie (kcal) equals 1,000 small calories and is the unit behind the food "Calorie" shown on nutrition labels.
Use this calculator to move between microjoules and kilocalories accurately for homework, engineering, billing, or everyday energy calculations. The Universal Converter uses exact unit factors, so results stay consistent across the site.