Kilojoule is 1000 joule units.
Kilojoules to Nanojoules Converter — kJ to nJ
Convert Kilojoule (kJ) to Nanojoule (nJ) using the exact conversion factor (1 kilojoule = 1,000,000,000,000 nanojoule). See the formula, worked examples, and conversion table.
Kilojoules to Nanojoules 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.
Nanojoule is 1e-9 joule units.
Result = input x 1000 / 1e-9.
Energy units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Kilojoules to Nanojoules
Kilojoule and Nanojoule 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 nanojoule is 1e-9 joule units.
Formula
nanojoules = kilojoules × 1000000000000
This factor comes from each unit's defined relationship to the category's base unit: 1 kilojoule equals 1000 base units, and 1 nanojoule equals 1e-9 base units, so dividing one by the other gives the direct kilojoule-to-nanojoule factor of 1000000000000.
Simple example
1 kJ × 1000000000000 = 1,000,000,000,000 nJ
1 kilojoule = 1,000,000,000,000 nanojoules.
Real-world example
100 kJ × 1000000000000 = 1e+14 nJ
100 kilojoules = 1e+14 nanojoules.
Conversion table
| Kilojoule (kJ) | Nanojoule (nJ) |
|---|---|
| 1 kJ | 1,000,000,000,000 nJ |
| 10 kJ | 1e+13 nJ |
| 50 kJ | 5e+13 nJ |
| 100 kJ | 1e+14 nJ |
| 500 kJ | 5e+14 nJ |
| 1,000 kJ | 1e+15 nJ |
Reverse conversion: Nanojoule to Kilojoule
1 nJ × 1e-12 = 1e-12 kJ
1 nanojoule = 1e-12 kilojoules.
kilojoules = nanojoules × 1e-12
For a page dedicated to this direction, see Nanojoule to Kilojoule.
Understanding the Kilojoule (kJ)
Kilojoule is 1000 joule units.
Understanding the Nanojoule (nJ)
Nanojoule is 1e-9 joule units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many nanojoules are in 1 kilojoule?
1 kilojoule equals 1,000,000,000,000 nanojoules, using the exact defined conversion factor rather than an estimate.
How do I convert kilojoule to nanojoule?
Multiply the kilojoule value by 1000000000000. The converter above does this instantly to whatever precision you set.
How do I convert nanojoule back to kilojoule?
Use the reverse factor: 1 nanojoule equals 1e-12 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 nanojoule?
Nanojoule (nJ) is a unit of engineering.
Is the kilojoule to nanojoule conversion exact?
Yes. Both kilojoule and nanojoule are defined by fixed standards rather than physical artifacts, so the factor of 1000000000000 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.