Kilojoule is 1000 joule units.
Kilojoules to Microjoules Converter — kJ to uJ
Convert Kilojoule (kJ) to Microjoule (uJ) using the exact conversion factor (1 kilojoule = 1,000,000,000 microjoule). See the formula, worked examples, and conversion table.
Kilojoules to Microjoules converter
Converter
Engineering Converter
Convert common stress, force, torque, power, and energy units used in engineering.
Context values
Some unit families need one extra value for a physically accurate result.
Microjoule is 0.000001 joule units.
Result = input x 1000 / 1e-6.
Energy units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Kilojoules to Microjoules
Kilojoule and Microjoule both measure a quantity used in structural or mechanical engineering — commonly stress, pressure, force, torque, power, or energy — where converting between the unit conventions used in different regions, industries, or equipment specifications is a routine part of design work. Specifically: Kilojoule is 1000 joule units, and microjoule is 0.000001 joule units.
Formula
microjoules = kilojoules × 1000000000
This factor comes from each unit's defined relationship to the category's base unit: 1 kilojoule equals 1000 base units, and 1 microjoule equals 0.000001 base units, so dividing one by the other gives the direct kilojoule-to-microjoule factor of 1000000000.
Simple example
1 kJ × 1000000000 = 1,000,000,000 uJ
1 kilojoule = 1,000,000,000 microjoules.
Real-world example
100 kJ × 1000000000 = 100,000,000,000 uJ
100 kilojoules = 100,000,000,000 microjoules.
Conversion table
| Kilojoule (kJ) | Microjoule (uJ) |
|---|---|
| 1 kJ | 1,000,000,000 uJ |
| 10 kJ | 10,000,000,000 uJ |
| 50 kJ | 50,000,000,000 uJ |
| 100 kJ | 100,000,000,000 uJ |
| 500 kJ | 500,000,000,000 uJ |
| 1,000 kJ | 1e+12 uJ |
Reverse conversion: Microjoule to Kilojoule
1 uJ × 1e-9 = 1e-9 kJ
1 microjoule = 1e-9 kilojoules.
kilojoules = microjoules × 1e-9
For a page dedicated to this direction, see Microjoule to Kilojoule.
Understanding the Kilojoule (kJ)
Kilojoule is 1000 joule units.
Understanding the Microjoule (uJ)
Microjoule is 0.000001 joule units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many microjoules are in 1 kilojoule?
1 kilojoule equals 1,000,000,000 microjoules, using the exact defined conversion factor rather than an estimate.
How do I convert kilojoule to microjoule?
Multiply the kilojoule value by 1000000000. The converter above does this instantly to whatever precision you set.
How do I convert microjoule back to kilojoule?
Use the reverse factor: 1 microjoule equals 1e-9 kilojoules. You can also use the swap control in the converter above to flip the direction instantly.
What is a kilojoule?
Kilojoule (kJ) is a unit of engineering.
What is a microjoule?
Microjoule (uJ) is a unit of engineering.
Is the kilojoule to microjoule conversion exact?
Yes. Both kilojoule and microjoule are defined by fixed standards rather than physical artifacts, so the factor of 1000000000 used above is exact to as many digits as you choose to display.
Why do engineering unit conventions vary so much by region and industry?
Pressure, force, and stress can be expressed in metric (pascal, newton), US customary (psi, pound-force), or older and industry-specific units (atmosphere, torr, kip) depending on the country, industry, and even the equipment manufacturer, which is why engineers routinely need to convert between them when working across specs from different sources.