Inch Poundsto Foot Pounds Converter
Free Inch poundsto foot pounds Converter for force pressure & torque units. Enter a value to see equivalent measurements across systems.
Inch Poundsto Foot Pounds Converter
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Formula: Foot-Pounds = Inch-Pounds / 12
Worked example — 48 in-lbs = 4.0000 ft-lbs = 5.4233 Nm
Formula
Foot-Pounds = Inch-Pounds / 12
Since there are exactly 12 inches in one foot, dividing inch-pounds by 12 gives foot-pounds. To convert foot-pounds to inch-pounds, multiply by 12. For newton-meters, multiply inch-pounds by 0.112985 or foot-pounds by 1.35582.
Worked Examples
Example 1: Converting Carburetor Bolt Torque
Problem:A small engine manual specifies carburetor mounting bolts at 48 inch-pounds. What is this in foot-pounds?
Solution:ft-lbs = inch-pounds / 12 ft-lbs = 48 / 12 = 4.0000 ft-lbs Nm = 48 x 0.112985 = 5.4233 Nm
Result:48 in-lbs = 4.0000 ft-lbs = 5.4233 Nm
Example 2: Converting Foot-Pounds to Inch-Pounds
Problem:A torque specification is 7.5 foot-pounds. Express this in inch-pounds for a more precise torque wrench.
Solution:in-lbs = ft-lbs x 12 in-lbs = 7.5 x 12 = 90.0000 in-lbs Nm = 7.5 x 1.35582 = 10.1687 Nm
Result:7.5 ft-lbs = 90.0000 in-lbs = 10.1687 Nm
Frequently Asked Questions
How many inch-pounds are in one foot-pound?
There are exactly 12 inch-pounds in one foot-pound. This relationship comes directly from the fact that there are 12 inches in one foot. Since torque is calculated as force multiplied by the distance from the pivot point, a force of one pound applied at a distance of one foot produces the same torque as that pound applied at twelve inches. This makes the conversion straightforward: divide inch-pounds by 12 to get foot-pounds, or multiply foot-pounds by 12 to get inch-pounds.
When should I use inch-pounds versus foot-pounds?
Inch-pounds are typically used for smaller, more precise torque applications such as tightening screws on electronics, small engine carburetor adjustments, firearm scope mounts, and delicate mechanical assemblies. Foot-pounds are used for larger fasteners and heavier applications like automotive lug nuts, engine cylinder head bolts, and structural bolting. As a general guideline, if the torque specification is less than about 20 foot-pounds (240 inch-pounds), using inch-pounds provides better granularity and precision.
Can I use a foot-pound torque wrench for inch-pound specifications?
While mathematically you can convert the values, most foot-pound torque wrenches lack the precision needed for accurate inch-pound work. A typical foot-pound wrench has a minimum setting around 10 ft-lbs (120 in-lbs) and increments of 1 ft-lb (12 in-lbs). For specifications requiring exact inch-pound values like 30 in-lbs (2.5 ft-lbs), you need a dedicated inch-pound torque wrench that can measure in smaller increments, typically 1 in-lb. Using the wrong scale wrench can result in over-tightening delicate fasteners.
Are inch-pounds and inch-ounces related?
Yes, inch-ounces are an even smaller unit of torque. There are 16 inch-ounces in one inch-pound, following the standard ounce-to-pound conversion. Inch-ounces are used for extremely delicate applications like adjusting watch mechanisms, calibrating precision instruments, or setting drag on fishing reels. To convert inch-ounces to inch-pounds, divide by 16. To convert inch-ounces to foot-pounds, divide by 192 (16 times 12).
How do I convert foot-pounds to newton-metres?
Multiply foot-pounds by 1.35582 to get newton-metres. The factor follows straight from the imperial definitions, since one pound-force is 4.44822 newtons and one foot is 0.3048 metres, and their product is 1.35582. It is also exactly twelve times the inch-pound factor, because 12 x 0.112985 = 1.35582, which gives a quick consistency check on any conversion chain. Going the other way, divide newton-metres by 1.35582 or multiply by 0.737562.
What is the difference between a pound-foot and a foot-pound?
Careful technical writing uses pound-foot, written lbf-ft, for torque and foot-pound, written ft-lbf, for work or energy, putting the force term first when a moment is meant. In practice most automotive manuals and torque wrenches print ft-lb for torque regardless, so the distinction rarely causes trouble in the shop. It matters when both quantities appear in the same document, because torque is a vector moment about an axis while energy is a scalar, and the two must never be added together.
How do beam-type and click-type torque wrenches differ for inch-pound work?
A beam wrench has a lever that deflects against a fixed pointer, so it reads torque continuously and has very little to drift out of calibration, but it must be read square on and is awkward in tight spaces. A click wrench uses a preloaded spring and cam that releases audibly at the set value, which is easier to use blind but depends on spring calibration and should be wound back to its lowest setting for storage. At low inch-pound values a dedicated small-range wrench of either type beats a large one set near its minimum.
What metric units correspond to inch-pounds on small-torque tools?
One inch-pound is 0.112985 newton-metres, which is more conveniently written as 11.2985 newton-centimetres on miniature drivers. Dividing 0.112985 by the 0.0980665 newton-metres in a kilogram-force centimetre gives 1.152 kgf-cm, or 1,152 gram-force centimetres. Working the other way, one kgf-cm is 0.868 in-lb. Metric datasheets for stepper motors, hinges and instrument screws usually quote N-cm or kgf-cm, so recognising which of the three scales a figure uses prevents an order-of-magnitude slip.
What is torque-angle tightening and does it apply to inch-pound fasteners?
Torque-angle, or torque-plus-turn, sets a low snug torque to seat the joint and pull the threads together, then specifies a further rotation in degrees. Because the extra clamp load comes from a measured stretch rather than from friction-contaminated torque readings, it is far more repeatable on bolts tightened near their yield point. It is mostly a foot-pound-scale practice on engine and suspension hardware; small inch-pound screws are normally torque-only, since the snug step alone would already reach the target.
Why are torque specifications given as a range rather than a single number?
No wrench delivers an exact value and no joint responds identically twice. Wrench mechanisms carry a stated accuracy tolerance from the manufacturer, operator technique adds scatter, and thread condition, plating and lubricant all shift how much of the applied torque becomes clamp load. A published range acknowledges that spread while keeping the resulting preload between the minimum needed to stop the joint loosening and the maximum the fastener or the mating material can take. Aim for the middle of the range rather than either edge.
References
Reviewed for accuracy by Manoj Kumar, Mathematics Educator · Editorial policy
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