Kilojoule is 1000 joule units.
Kilojoules to Ergs Converter — kJ to erg
Convert Kilojoule (kJ) to Erg (erg) using the exact conversion factor (1 kilojoule = 10,000,000,000 erg). See the formula, worked examples, and conversion table.
Kilojoules to Ergs converter
Converter
Scientific Units Converter
Convert SI derived units, scientific notation-friendly units, atomic units, and lab measurements.
Context values
Some unit families need one extra value for a physically accurate result.
An erg is a CGS energy unit.
Result = input x 1000 / 1e-7.
Energy units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Kilojoules to Ergs
Kilojoule and Erg are both scientific-measurement units, spanning everything from atomic and laboratory scales to astronomical distances — the kind of conversion that comes up constantly in physics, chemistry, and astronomy when a result needs to move between conventions used in different subfields. Specifically: Kilojoule is 1000 joule units, and an erg is a CGS energy unit.
Formula
ergs = kilojoules × 10000000000
This factor comes from each unit's defined relationship to the category's base unit: 1 kilojoule equals 1000 base units, and 1 erg equals 1e-7 base units, so dividing one by the other gives the direct kilojoule-to-erg factor of 10000000000.
Simple example
1 kJ × 10000000000 = 10,000,000,000 erg
1 kilojoule = 10,000,000,000 ergs.
Real-world example
10 kJ × 10000000000 = 100,000,000,000 erg
10 kilojoules = 100,000,000,000 ergs.
Conversion table
| Kilojoule (kJ) | Erg (erg) |
|---|---|
| 0.001 kJ | 10,000,000 erg |
| 0.01 kJ | 100,000,000 erg |
| 1 kJ | 10,000,000,000 erg |
| 10 kJ | 100,000,000,000 erg |
| 100 kJ | 1e+12 erg |
| 1,000 kJ | 1e+13 erg |
Reverse conversion: Erg to Kilojoule
1 erg × 1e-10 = 1e-10 kJ
1 erg = 1e-10 kilojoules.
kilojoules = ergs × 1e-10
For a page dedicated to this direction, see Erg to Kilojoule.
Understanding the Kilojoule (kJ)
Kilojoule is 1000 joule units.
Understanding the Erg (erg)
An erg is a CGS energy unit.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many ergs are in 1 kilojoule?
1 kilojoule equals 10,000,000,000 ergs, using the exact defined conversion factor rather than an estimate.
How do I convert kilojoule to erg?
Multiply the kilojoule value by 10000000000. The converter above does this instantly to whatever precision you set.
How do I convert erg back to kilojoule?
Use the reverse factor: 1 erg equals 1e-10 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 scientific units.
What is a erg?
Erg (erg) is a unit of scientific units.
Is the kilojoule to erg conversion exact?
Yes. Both kilojoule and erg are defined by fixed standards rather than physical artifacts, so the factor of 10000000000 used above is exact to as many digits as you choose to display.
Why does this category span everything from atomic to astronomical scales?
Scientific work spans an enormous range of physical scales, from atomic distances (measured in angstroms or atomic mass units) to interstellar distances (measured in astronomical units or parsecs), so this category groups SI-derived and scale-specific units that researchers commonly need to convert between within their field.