Convert Torque from Kilogram-meters to Pound-inches (kgm to lbf-in)

Kilogram-meter to Pound-inch Conversion Formula

Example

Let's convert 5 Kilogram-meter (kgm) to Pound-inch (lbf-in).

Using the formula:

Therefore, 5 Kilogram-meter (kgm) is equal to 433.9808145247106175 Pound-inch (lbf-in).

How many kilogram-meters are in one pound-inch? One Pound-inch (lbf-in) contains 0.011521246637310283405 Kilogram-meters (kgm) — the inverse of the factor above. Multiplying by 86.7961629049421235 takes you from kilogram-meters to pound-inches; multiplying by 0.011521246637310283405 brings you back.

Put in words: one kilogram-meter equals 86.7961629049421235 pound-inches, so the kilogram-meter is the larger unit of this pair. Converting between them never changes the amount of torque being measured — only the size of the unit you count it in.

What Is a Kilogram-meter (kgf·m)?

A kilogram-meter (kgf·m), sometimes written kg·m or kgm, is the torque produced by one kilogram-force acting at one metre from the axis.

• 1 kgf·m = 9.80665 N·m

A Gravitational Metric Unit

Like the kilogram-force it derives from, this unit builds the Earth's gravity into its definition. That made it convenient before SI was standardised — a 1 kg weight hung on a 1 m arm gives exactly 1 kgf·m — but it is deprecated in modern engineering, where N·m is the correct unit.

Where You Still Meet It

• Older Japanese and European vehicles — service manuals from the 1970s and 1980s specify torque in kgf·m.
• Motorcycle specifications, where engine torque is still occasionally quoted in kgf·m.
• Legacy torque wrenches with kgf·m scales.
• Older industrial machinery documentation.

If a workshop manual gives 11 kgf·m for a wheel nut, that is roughly 108 N·m — a normal modern figure, just written in an older unit.

Converting Kilogram-meter

What Is a Pound-inch (lbf·in)?

A pound-inch (lbf·in) is one pound-force applied at one inch from the axis of rotation. It is the small-torque companion to the pound-foot.

• 1 lbf·ft = 12 lbf·in (exactly, since a foot is twelve inches)
• 1 lbf·in = 0.112985 N·m

Why a Smaller Imperial Unit Exists

Many fasteners are tightened to far less than one pound-foot. Writing "0.4 lbf·ft" invites a decimal-point error on a shop floor; writing "5 lbf·in" does not. Small-torque work therefore uses inch units almost exclusively.

Where Pound-inch Is Used

• Electrical terminals — breaker lugs and terminal blocks are specified in lbf·in, and both under- and overtightening cause failures.
• Electronics and instrument assembly — small screws in enclosures and connectors.
• Aerospace fasteners — small-diameter hardware throughout aircraft assembly.
• Optics, firearms and precision equipment — mounting screws where excess torque distorts the assembly.

Torque screwdrivers and small click wrenches are graduated in lbf·in for exactly this range.

A Common and Expensive Mistake

Confusing lbf·in with lbf·ft applies twelve times the intended torque. On a 5 lbf·in electrical terminal this shears the screw or crushes the conductor. Always check which unit the specification uses before setting a wrench.

Converting Pound-inch

Kilogram-meter to Pound-inch Conversion Table

Here are some quick reference conversions from Kilogram-meter (kgm) to Pound-inch (lbf-in):