Joules (J) to Ergs Converter
Enter a value to instantly convert between energy units.
1 Joule = 10000000 Erg
Key Formulas
Kilocalorie → Kilojoule
kJ = kcal × 4.184Kilojoule → Kilocalorie
kcal = kJ × 0.239006Kilowatt-Hour → Joule
J = kWh × 3600000Joule → Kilowatt-Hour
kWh = J × 2.77778e-7Formula
erg = J ÷ 1e-7An erg is the CGS (centimeter-gram-second) unit of energy — the work done by a force of one dyne over one centimeter. One erg equals exactly 10⁻⁷ joules. While the SI (joule) has replaced ergs in most scientific work, ergs still appear in older physics texts, astronomy, and some engineering contexts.
Source: NIST SP 811, Table B.8
Frequently Asked Questions
Real-World Examples
A physics student learning that 1 J equals 10 million ergs — useful for the homework set.
1 J = 10000000 erg
A mechanical engineer calculating 1 mJ (0.001 J) of impact energy reports 10,000 ergs for the legacy system.
0.001 J = 10000 erg
A materials scientist measuring 10 J of fracture energy writes 100 million ergs in the paper.
10 J = 100000000 erg
A micro-mechanics researcher noting that 1 μJ equals 10 ergs — the scale of MEMS devices.
0.000001 J = 10 erg