Work from one pound-force over one foot.
Foot-pounds to Nanojoules Converter — ft-lb to nJ
Convert Foot-pound (ft-lb) to Nanojoule (nJ) using the exact conversion factor (1 foot-pound = 1,355,817,948 nanojoule). See the formula, worked examples, and conversion table.
Foot-pounds 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 1.355817948 / 1e-9.
Energy units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Foot-pounds to Nanojoules
Foot-pound 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: Work from one pound-force over one foot, and nanojoule is 1e-9 joule units.
Formula
nanojoules = foot-pounds × 1355817948.33
This factor comes from each unit's defined relationship to the category's base unit: 1 foot-pound equals 1.35581794833 base units, and 1 nanojoule equals 1e-9 base units, so dividing one by the other gives the direct foot-pound-to-nanojoule factor of 1355817948.33.
Simple example
1 ft-lb × 1355817948 = 1,355,817,948 nJ
1 foot-pound = 1,355,817,948 nanojoules.
Real-world example
100 ft-lb × 1355817948 = 135,581,794,800 nJ
100 foot-pounds = 135,581,794,800 nanojoules.
Conversion table
| Foot-pound (ft-lb) | Nanojoule (nJ) |
|---|---|
| 1 ft-lb | 1,355,817,948 nJ |
| 10 ft-lb | 13,558,179,480 nJ |
| 50 ft-lb | 67,790,897,420 nJ |
| 100 ft-lb | 135,581,794,800 nJ |
| 500 ft-lb | 677,908,974,200 nJ |
| 1,000 ft-lb | 1.355818e+12 nJ |
Reverse conversion: Nanojoule to Foot-pound
1 nJ × 7.375621e-10 = 7.375621e-10 ft-lb
1 nanojoule = 7.375621e-10 foot-pounds.
foot-pounds = nanojoules × 7.375621e-10
For a page dedicated to this direction, see Nanojoule to Foot-pound.
Understanding the Foot-pound (ft-lb)
Work from one pound-force over one foot.
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 foot-pound?
1 foot-pound equals 1,355,817,948 nanojoules, using the exact defined conversion factor rather than an estimate.
How do I convert foot-pound to nanojoule?
Multiply the foot-pound value by 1355817948. The converter above does this instantly to whatever precision you set.
How do I convert nanojoule back to foot-pound?
Use the reverse factor: 1 nanojoule equals 7.375621e-10 foot-pounds. You can also use the swap control in the converter above to flip the direction instantly.
What is a foot-pound?
Foot-pound (ft-lb) is a unit of engineering.
What is a nanojoule?
Nanojoule (nJ) is a unit of engineering.
Is the foot-pound to nanojoule conversion exact?
Yes. Both foot-pound and nanojoule are defined by fixed standards rather than physical artifacts, so the factor of 1355817948 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.