An erg is a CGS energy unit.
Ergs to Foot-pounds Converter — erg to ft-lb
Convert Erg (erg) to Foot-pound (ft-lb) using the exact conversion factor (1 erg = 7.375621e-8 foot-pound). See the formula, worked examples, and conversion table.
Ergs to Foot-pounds 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.
Work from one pound-force over one foot.
Result = input x 1e-7 / 1.355817948.
Energy units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Ergs to Foot-pounds
Erg and Foot-pound 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: An erg is a CGS energy unit, and work from one pound-force over one foot.
Formula
foot-pounds = ergs × 7.375621e-8
This factor comes from each unit's defined relationship to the category's base unit: 1 erg equals 1e-7 base units, and 1 foot-pound equals 1.35581794833 base units, so dividing one by the other gives the direct erg-to-foot-pound factor of 7.375621e-8.
Simple example
1 erg × 7.375621e-8 = 7.375621e-8 ft-lb
1 erg = 7.375621e-8 foot-pounds.
Real-world example
100 erg × 7.375621e-8 = 0.0000073756 ft-lb
100 ergs = 0.0000073756 foot-pounds.
Conversion table
| Erg (erg) | Foot-pound (ft-lb) |
|---|---|
| 1 erg | 7.375621e-8 ft-lb |
| 10 erg | 7.375621e-7 ft-lb |
| 50 erg | 0.0000036878 ft-lb |
| 100 erg | 0.0000073756 ft-lb |
| 500 erg | 0.0000368781 ft-lb |
| 1,000 erg | 0.0000737562 ft-lb |
Reverse conversion: Foot-pound to Erg
7.375621e-8 ft-lb × 13558179.48 = 0.9999999332 erg
7.375621e-8 foot-pounds = 0.9999999332 ergs.
ergs = foot-pounds × 13558179.4833
For a page dedicated to this direction, see Foot-pound to Erg.
Understanding the Erg (erg)
An erg is a CGS energy unit.
Understanding the Foot-pound (ft-lb)
Work from one pound-force over one foot.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many foot-pounds are in 1 erg?
1 erg equals 7.375621e-8 foot-pounds, using the exact defined conversion factor rather than an estimate.
How do I convert erg to foot-pound?
Multiply the erg value by 7.375621e-8. The converter above does this instantly to whatever precision you set.
How do I convert foot-pound back to erg?
Use the reverse factor: 1 foot-pound equals 13,558,179.48 ergs. You can also use the swap control in the converter above to flip the direction instantly.
What is a erg?
Erg (erg) is a unit of engineering.
What is a foot-pound?
Foot-pound (ft-lb) is a unit of engineering.
Is the erg to foot-pound conversion exact?
Yes. Both erg and foot-pound are defined by fixed standards rather than physical artifacts, so the factor of 7.375621e-8 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.