Foot Pounds to Megajoules
Convert foot pounds to megajoules instantly — one foot-pound is 1.35582e-06 megajoules.
| Foot Pounds | Megajoules |
|---|---|
| 1 ft·lb | 1.35582e-06 MJ |
| 2 ft·lb | 2.71164e-06 MJ |
| 3 ft·lb | 4.06745e-06 MJ |
| 5 ft·lb | 6.77909e-06 MJ |
| 10 ft·lb | 1.35582e-05 MJ |
| 25 ft·lb | 3.38954e-05 MJ |
| 50 ft·lb | 6.77909e-05 MJ |
| 100 ft·lb | 0.000136 MJ |
How to use
- Enter a value in the Foot Pounds field.
- The Megajoules figure appears immediately — no button to press.
- Typing in the Megajoules field converts back to Foot Pounds the same way.
- Use the reference table for the values that come up most often.
Foot Pounds to Megajoules formula
To convert foot pounds to megajoules, multiply by 1.35581795e-06.
MJ = ft·lb × 1.35581795e-06
Why this factor: the foot-pound and the megajoule are both defined against the joule, so dividing one definition by the other gives 1.35581795e-06 directly. Both definitions are set out in full below.
To go the other way, divide by 1.35581795e-06 — or use the Megajoules to Foot Pounds converter, which is the same calculation reversed.
Worked example
Take 2000 ft·lb and multiply by the factor 1.35581795e-06: the result is 0.002712 MJ.
2000 ft·lb × 1.35581795e-06 = 0.002712 MJ
The converter above does this for any value you type, in either direction.
What is a foot-pound?
A foot-pound is the work done by one pound-force acting through one foot.
Definition: About 1.3558179 joules.
Where it is used: US mechanical work and torque figures, fastener specifications, and firearm muzzle energy.
Worth knowing: As a torque unit it is properly 'pound-foot' (lbf·ft); as an energy unit it is 'foot-pound'. The numbers coincide but the quantities differ.
What is a megajoule?
A megajoule is one million joules, used for substantial energy quantities.
Definition: Exactly 1×10⁶ joules. One kilowatt-hour is exactly 3.6 MJ.
Where it is used: Fuel energy content, natural gas billing, and industrial energy accounting.
Foot Pounds vs Megajoules
The foot-pound is a US customary unit while the megajoule is a metric unit. That is why the factor between them is not a round number: the two systems were defined independently and only later tied together by exact agreement.
Frequently asked questions
How many megajoules are in a foot-pound?
One foot-pound equals 1.35581795e-06 megajoules.
What is the formula to convert foot pounds to megajoules?
Multiply the number of foot pounds by 1.35581795e-06. To reverse it, divide by 1.35581795e-06 instead.
How do I convert megajoules back to foot pounds?
Divide by 1.35581795e-06, which is the same as multiplying by 737562.149.
How many megajoules are in 10 foot pounds?
10 ft·lb works out to 1.35582e-05 MJ.
Is there anything to watch out for with foot pounds?
As a torque unit it is properly 'pound-foot' (lbf·ft); as an energy unit it is 'foot-pound'. The numbers coincide but the quantities differ.
How is the foot-pound defined?
About 1.3558179 joules.