Work from one pound-force over one foot.
Foot-pounds to Megajoules Converter — ft-lb to MJ
Convert Foot-pound (ft-lb) to Megajoule (MJ) using the exact conversion factor (1 foot-pound = 0.0000013558 megajoule). See the formula, worked examples, and conversion table.
Foot-pounds to Megajoules 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.
Megajoule is 1000000 joule units.
Result = input x 1.355817948 / 1e+6.
Energy units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Foot-pounds to Megajoules
Foot-pound and Megajoule 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 megajoule is 1000000 joule units.
Formula
megajoules = foot-pounds × 0.00000135581794833
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 megajoule equals 1000000 base units, so dividing one by the other gives the direct foot-pound-to-megajoule factor of 0.00000135581794833.
Simple example
1 ft-lb × 0.000001355817948 = 0.0000013558 MJ
1 foot-pound = 0.0000013558 megajoules.
Real-world example
100 ft-lb × 0.000001355817948 = 0.0001355818 MJ
100 foot-pounds = 0.0001355818 megajoules.
Conversion table
| Foot-pound (ft-lb) | Megajoule (MJ) |
|---|---|
| 1 ft-lb | 0.0000013558 MJ |
| 10 ft-lb | 0.0000135582 MJ |
| 50 ft-lb | 0.0000677909 MJ |
| 100 ft-lb | 0.0001355818 MJ |
| 500 ft-lb | 0.000677909 MJ |
| 1,000 ft-lb | 0.0013558179 MJ |
Reverse conversion: Megajoule to Foot-pound
0.0000013558 MJ × 737562.1493 = 0.999986762 ft-lb
0.0000013558 megajoules = 0.999986762 foot-pounds.
foot-pounds = megajoules × 737562.149277
For a page dedicated to this direction, see Megajoule to Foot-pound.
Understanding the Foot-pound (ft-lb)
Work from one pound-force over one foot.
Understanding the Megajoule (MJ)
Megajoule is 1000000 joule units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many megajoules are in 1 foot-pound?
1 foot-pound equals 0.0000013558 megajoules, using the exact defined conversion factor rather than an estimate.
How do I convert foot-pound to megajoule?
Multiply the foot-pound value by 0.000001355817948. The converter above does this instantly to whatever precision you set.
How do I convert megajoule back to foot-pound?
Use the reverse factor: 1 megajoule equals 737,562.1493 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 megajoule?
Megajoule (MJ) is a unit of engineering.
Is the foot-pound to megajoule conversion exact?
Yes. Both foot-pound and megajoule are defined by fixed standards rather than physical artifacts, so the factor of 0.000001355817948 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.