Joules to Foot-pounds Converter
Enter the energy in joules below to convert it to foot-pounds.
Convert Joules to Foot-pounds
Enter a value in joules (J) to convert to foot-pounds (ft·lbf).
Joule to Foot-pound Conversion Table
Table showing various joule measurements converted to foot-pounds. Click any preset value or arrow to load it into the converter.
| Joules (J) | Foot-pounds (ft·lbf) |
|---|---|
| 1 J | 0.7375621 ft·lbf |
| 2 J | 1.4751243 ft·lbf |
| 5 J | 3.6878107 ft·lbf |
| 10 J | 7.3756215 ft·lbf |
| 15 J | 11.0634322 ft·lbf |
| 20 J | 14.751243 ft·lbf |
| 25 J | 18.4390537 ft·lbf |
| 30 J | 22.1268645 ft·lbf |
| 50 J | 36.8781075 ft·lbf |
| 75 J | 55.3171612 ft·lbf |
How to Convert Joules to Foot-pounds
To convert joules to foot-pounds, multiply the energy by the following conversion ratio: 0.7375621 foot-pounds/joule.
Since one joule is equal to 0.7375621 foot-pounds, you can use this simple formula to convert:
The energy in foot-pounds is equal to the energy in joules multiplied by 0.7375621.
For example, here's how to convert 100 joules to foot-pounds using the formula above.
How Many Foot-pounds Are in a Joule?
There are 0.7375621 foot-pounds in a joule, which is why we use this value in the formula above.
Our joule to foot-pound calculator automatically converts your energy measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Joules and foot-pounds are both units used to measure energy. Keep reading to learn more about each unit.
What Is a Joule?
Coherent SI unit of energy and work (1 W·s = 1 N·m). It serves as a primary reference unit for measuring energy across scientific and practical applications. [1]
The joule is classified as an International System of Units (SI) unit of energy. Joules can be abbreviated as J; for example, 1 joule can be written as 1 J.
As the primary coherent reference unit for energy in this category, all other energy units are mathematically anchored to the joule (J).
In practice, joules (J) are widely used across standard energy applications within International System of Units (SI) workflows, engineering documentation, and technical data sheets.
What Is a Foot-pound?
A foot-pound is a unit of energy equal to 1.3558179 joules (J), the base unit for energy. Mechanical work unit equal to 1.355818 Joules. [2]
The foot-pound is classified as a US customary and imperial unit of energy. Foot-pounds can be abbreviated as ft·lbf; for example, 1 foot-pound can be written as 1 ft·lbf.
When working with foot-pounds (ft·lbf) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, foot-pounds (ft·lbf) are widely used across standard energy applications within US customary and imperial workflows, engineering documentation, and technical data sheets.
When converting energy between joules (J) and foot-pounds (ft·lbf), keep full floating-point precision (1 J = 0.7375621 ft·lbf; 1 ft·lbf = 1.3558179 J) during intermediate calculations and round only the final foot-pound figure to match your instrument tolerance.
More Joule & Foot-pound Conversions
Need to calculate in the opposite direction? Use our foot-pounds to joules converter (ft·lbf to J) to switch your starting unit immediately. You can also explore related tools such as converting joules to calories, converting joules to kilojoules, or converting calories to joules.
Convert from Joules
Frequently Asked Questions
References
- [1]NIST CODATA StandardNIST CODATA (CODATA Energy & Thermodynamic Constants)·Energy Metrology Standard — Joules (J) to Foot-pounds (ft·lbf)
- [2]NIST SP 811 SpecificationNIST SP 811 (NIST SP 811 App. B.9 (Energy, Work & Heat))·Unit Specifications: Joule (J) & Foot-pound (ft·lbf) (ft·lbf)
- [3]BIPM ReferenceBIPM (Derived SI Unit: Joule (J))·Conversion Factors & Mathematical Basis (J to ft·lbf)