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 Kilojoules
Convert Microjoule (uJ) to Kilojoule (kJ) instantly with an exact formula, conversion table, and FAQ.
Reserved for a responsive leaderboard above the conversion details.
Professional calculator style
World-scale conversion engine
30+ categories
6,500+ units
Instant results
Offline ready
Energy calculator
Energy Converter
Convert microjoules (uJ) to kilojoules (kJ) instantly with formula, conversion table, and FAQ.
Context values
Some unit families need one extra value for a physically accurate result.
A kilojoule (kJ) equals 1,000 joules and is commonly used on nutrition labels outside the United States.
kJ = uJ × 1.000000000e-09
Results update instantly for Microjoules to Kilojoules conversions.
Reserved above the conversion cards and below the converter.
Formula
kJ = uJ × 1.000000000e-09
uJ = kJ × 1000000000
Conversion table
| 1 uJ | 1.000000e-09 kJ |
| 5 uJ | 5.000000e-09 kJ |
| 10 uJ | 1.000000e-08 kJ |
| 20 uJ | 2.000000e-08 kJ |
| 50 uJ | 5.000000e-08 kJ |
| 100 uJ | 1.000000e-07 kJ |
| 500 uJ | 5.000000e-07 kJ |
| 1000 uJ | 0.000001 kJ |
Related conversions
Reserved between the cards and the FAQ so the page stays balanced.
How the formula works
Both microjoule and kilojoule measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in microjoules by 1.000000000e-09 to get kilojoules. To reverse the conversion, multiply a kilojoule value by 1000000000 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 Kilojoule (kJ)?
A kilojoule (kJ) equals 1,000 joules and is commonly used on nutrition labels outside the United States.
How do I convert microjoules to kilojoules?
Multiply the microjoule value by 1.000000000e-09 to get the equivalent in kilojoules. For example, 5 uJ × 1.000000000e-09 = 5.000000e-09 kJ.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 1.000000000e-09 is an exact, non-rounded value.
Can I convert kilojoules back to microjoules?
Yes. Divide the kilojoule value by 1.000000000e-09, or multiply it by 1000000000, to get microjoules.
Reserved between the FAQ and the article so the page stays balanced.
About converting microjoules to kilojoules
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 kilojoule (kJ) equals 1,000 joules and is commonly used on nutrition labels outside the United States.
Use this calculator to move between microjoules and kilojoules accurately for homework, engineering, billing, or everyday energy calculations. The Universal Converter uses exact unit factors, so results stay consistent across the site.