Torque from one pound-force at one inch.
Pound-inches to Femtonewton meters Converter — lb in to fN m
Convert Pound-inch (lb in) to Femtonewton meter (fN m) using the exact conversion factor (1 pound-inch = 1.129848e+14 femtonewton meter). See the formula, worked examples, and conversion table.
Pound-inches to Femtonewton meters 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.
Femtonewton meter is 1e-15 newton meter units.
Result = input x 0.112984829 / 1e-15.
Torque units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Pound-inches to Femtonewton meters
Pound-inch and Femtonewton meter 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: Torque from one pound-force at one inch, and femtonewton meter is 1e-15 newton meter units.
Formula
femtonewton meters = pound-inches × 1.129848e+14
This factor comes from each unit's defined relationship to the category's base unit: 1 pound-inch equals 0.112984829028 base units, and 1 femtonewton meter equals 1e-15 base units, so dividing one by the other gives the direct pound-inch-to-femtonewton meter factor of 1.129848e+14.
Simple example
1 lb in × 1.129848e+14 = 1.129848e+14 fN m
1 pound-inch = 1.129848e+14 femtonewton meters.
Real-world example
100 lb in × 1.129848e+14 = 1.129848e+16 fN m
100 pound-inches = 1.129848e+16 femtonewton meters.
Conversion table
| Pound-inch (lb in) | Femtonewton meter (fN m) |
|---|---|
| 1 lb in | 1.129848e+14 fN m |
| 10 lb in | 1.129848e+15 fN m |
| 50 lb in | 5.649241e+15 fN m |
| 100 lb in | 1.129848e+16 fN m |
| 500 lb in | 5.649241e+16 fN m |
| 1,000 lb in | 1.129848e+17 fN m |
Reverse conversion: Femtonewton meter to Pound-inch
1.129848e+14 fN m × 8.850746e-15 = 0.9999997431 lb in
1.129848e+14 femtonewton meters = 0.9999997431 pound-inches.
pound-inches = femtonewton meters × 8.850746e-15
For a page dedicated to this direction, see Femtonewton meter to Pound-inch.
Understanding the Pound-inch (lb in)
Torque from one pound-force at one inch.
Understanding the Femtonewton meter (fN m)
Femtonewton meter is 1e-15 newton meter units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many femtonewton meters are in 1 pound-inch?
1 pound-inch equals 1.129848e+14 femtonewton meters, using the exact defined conversion factor rather than an estimate.
How do I convert pound-inch to femtonewton meter?
Multiply the pound-inch value by 1.129848e+14. The converter above does this instantly to whatever precision you set.
How do I convert femtonewton meter back to pound-inch?
Use the reverse factor: 1 femtonewton meter equals 8.850746e-15 pound-inches. You can also use the swap control in the converter above to flip the direction instantly.
What is a pound-inch?
Pound-inch (lb in) is a unit of engineering.
What is a femtonewton meter?
Femtonewton meter (fN m) is a unit of engineering.
Is the pound-inch to femtonewton meter conversion exact?
Yes. Both pound-inch and femtonewton meter are defined by fixed standards rather than physical artifacts, so the factor of 1.129848e+14 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.