Foot-pounds to Megajoules

Convert foot-pounds (ft·lb) to megajoules (MJ). Type a value below to see the result update instantly. Reference table and formula included.

Calculator

Foot-pounds

ft·lb

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Megajoules

1 ft·lb = 1.3558e-6 MJ

Foot-pounds to Megajoules Conversion Table

Common values, ready to copy:

foot-pounds	megajoules
1 ft·lb	1.3558e-6 MJ
2 ft·lb	2.7116e-6 MJ
5 ft·lb	6.7791e-6 MJ
10 ft·lb	1.3558e-5 MJ
25 ft·lb	3.3896e-5 MJ
50 ft·lb	6.7791e-5 MJ
100 ft·lb	0.000136 MJ
1,000 ft·lb	0.001356 MJ

Formula

megajoules = foot-pounds × 0.00000135582

Energy uses the SI joule. Food calories (kcal) are 1,000 small calories: 1 kcal = 4,184 J. 1 kWh = 3.6 MJ = 3,600,000 J. 1 BTU = 1,055.06 J.

About Foot-pounds and Megajoules

Foot-pounds (ft·lb): The work done lifting one pound through one foot against gravity; 1 ft·lb = 1.35582 J. Common uses: Torque specifications in US automotive contexts (lug nuts, bolt torque), and some US engineering work.

Megajoules (MJ): A million joules; the unit for larger-scale energy quantities. Common uses: Daily food intake (a typical adult consumes 8-10 MJ per day), fuel energy content (gasoline ≈ 34 MJ per liter), and industrial energy.

How the conversion works

Energy uses the SI joule. Food calories (kcal) are 1,000 small calories: 1 kcal = 4,184 J. 1 kWh = 3.6 MJ = 3,600,000 J. 1 BTU = 1,055.06 J.

The exact relationship is megajoules = foot-pounds × 0.00000135582, which the calculator at the top of this page applies in both directions. Type into either field and the other updates immediately.

When this conversion matters

Converting between foot-pounds and megajoules comes up wherever energy measurements move between systems — from one country's conventions to another's, from a scientific reference to a practical specification, or from one industry's working unit to another's. The calculator and reference table above cover the everyday range; for unusual values you can type any number into either field.