A kilojoule (kJ) equals 1,000 joules and is commonly used on nutrition labels outside the United States.
Kilojoules to Microjoules
Convert Kilojoule (kJ) to Microjoule (uJ) instantly with an exact formula, conversion table, and FAQ.
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Convert kilojoules (kJ) to microjoules (uJ) instantly with formula, conversion table, and FAQ.
Context values
Some unit families need one extra value for a physically accurate result.
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.
uJ = kJ × 1000000000
Results update instantly for Kilojoules to Microjoules conversions.
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Formula
uJ = kJ × 1000000000
kJ = uJ × 1.000000000e-09
Conversion table
| 1 kJ | 1.000000e+09 uJ |
| 5 kJ | 5.000000e+09 uJ |
| 10 kJ | 1.000000e+10 uJ |
| 20 kJ | 2.000000e+10 uJ |
| 50 kJ | 5.000000e+10 uJ |
| 100 kJ | 1.000000e+11 uJ |
| 500 kJ | 5.000000e+11 uJ |
| 1000 kJ | 1.000000e+12 uJ |
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How the formula works
Both kilojoule and microjoule measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in kilojoules by 1000000000 to get microjoules. To reverse the conversion, multiply a microjoule value by 1.000000000e-09 to get back to kilojoules.
Frequently asked questions
What is Kilojoule (kJ)?
A kilojoule (kJ) equals 1,000 joules and is commonly used on nutrition labels outside the United States.
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.
How do I convert kilojoules to microjoules?
Multiply the kilojoule value by 1000000000 to get the equivalent in microjoules. For example, 5 kJ × 1000000000 = 5.000000e+09 uJ.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 1000000000 is an exact, non-rounded value.
Can I convert microjoules back to kilojoules?
Yes. Divide the microjoule value by 1000000000, or multiply it by 1.000000000e-09, to get kilojoules.
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About converting kilojoules to microjoules
A kilojoule (kJ) equals 1,000 joules and is commonly used on nutrition labels outside the United States. 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.
Use this calculator to move between kilojoules and microjoules accurately for homework, engineering, billing, or everyday energy calculations. The Universal Converter uses exact unit factors, so results stay consistent across the site.