Conversions
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Foot-Pounds to Joules Converter.
Convert foot-pounds-force of work or torque to joules.
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Uses the international foot and pound-force: 1 ft·lbf = 1.3558179483314004 J.
FAQs
How does the foot-pounds to joules converter work?
Uses the international foot and pound-force: 1 ft·lbf = 1.3558179483314004 J.
Use Cases
Engineering and Physics Calculations
Convert work or energy values from foot-pounds to joules for consistency in scientific formulas and engineering projects.
Example: Convert 50 ft-lb of work to joules: 50 × 1.35582 = 67.791 J.
Automotive and Mechanical Torque Specs
When working with torque specifications in foot-pounds, convert to joules for comparison with international standards or for calculations involving rotational energy.
Example: A torque of 100 ft-lb is equivalent to 135.582 J.
Frequently Asked Questions
- How do I convert foot-pounds to joules?
- To convert foot-pounds to joules, multiply the number of foot-pounds by 1.35582. For example, 10 foot-pounds equals 13.5582 joules. Our converter does this calculation instantly for you.
- What is the difference between foot-pounds and joules?
- Foot-pounds and joules are both units of energy or work. One foot-pound is the energy required to move a one-pound force over a distance of one foot. One joule is the energy transferred when a one-newton force moves an object one meter. They are related by the conversion factor 1 ft-lb = 1.35582 J.
- Can I use this converter for torque measurements?
- Yes, this converter can be used for torque measurements as well. Torque is often expressed in foot-pounds, and converting to joules (or newton-meters) can be useful in engineering contexts. Note that torque and energy have the same units but represent different physical concepts.
Tips & Common Mistakes
Tips
- Remember the conversion factor: 1 foot-pound = 1.35582 joules. Use this for quick manual checks.
- For precise results, use the exact conversion factor rather than rounding to 1.36.
- When converting torque, note that the result is in joules, which is equivalent to newton-meters (N·m).
- Double-check your input value to ensure it is in foot-pounds, not inch-pounds, to avoid errors.
Common Mistakes to Avoid
- Using the wrong conversion factor, such as 1.36 instead of 1.35582, leading to slight inaccuracies.
- Confusing foot-pounds with inch-pounds; 1 foot-pound equals 12 inch-pounds, so ensure your value is in the correct unit.
- Forgetting that torque and energy are different concepts even though they share units; the conversion is valid for both but the interpretation differs.
Last updated: August 13, 2026