Convert Torque from Pound-feet to Centinewton-meters (lbf-ft to cNm)

Pound-foot to Centinewton-meter Conversion Formula

Example

Let's convert 5 Pound-foot (lbf-ft) to Centinewton-meter (cNm).

Using the formula:

Therefore, 5 Pound-foot (lbf-ft) is equal to 677.909 Centinewton-meter (cNm).

How many pound-feet are in one centinewton-meter? One Centinewton-meter (cNm) contains 0.0073756212116965551424 Pound-feet (lbf-ft) — the inverse of the factor above. Multiplying by 135.5818 takes you from pound-feet to centinewton-meters; multiplying by 0.0073756212116965551424 brings you back.

Put in words: one pound-foot equals 135.5818 centinewton-meters, so the pound-foot 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 Pound-foot (lbf·ft)?

A pound-foot (lbf·ft) is the US customary unit of torque: the twisting effect of one pound-force applied at a perpendicular distance of one foot from the axis.

• 1 lbf·ft = 1.355818 N·m

Pound-foot Versus Foot-pound

You will see both spellings, and in practice they are used interchangeably for torque. Strictly:

• Pound-foot (lbf·ft) is the correct name for torque.
• Foot-pound (ft·lb) properly describes energy — the same distinction as newton-meter versus joule.

Almost every workshop manual, torque wrench and specification sheet writes "ft-lb" and means torque. Read it as pound-foot and you will not go wrong.

Where Pound-foot Is Used

• US automotive service — wheel nuts, cylinder heads, suspension bolts.
• Engine specifications — American engines are advertised in horsepower and lbf·ft.
• Construction and heavy equipment in US markets.
• Torque wrenches sold in the United States, usually graduated in lbf·ft with a secondary N·m scale.

Everyday Reference Points

• A typical car wheel nut: 80–100 lbf·ft.
• A car oil drain plug: 25–30 lbf·ft.
• A large pickup truck engine: 400–1,000 lbf·ft.

Converting Pound-foot

What Is a Centinewton-meter (cN·m)?

A centinewton-meter (cN·m) is one hundredth of a newton-meter — a metric SI-prefixed unit for very small torques.

• 1 cN·m = 0.01 N·m
• 1 N·m = 100 cN·m

Why Such a Small Unit

Some torques are genuinely tiny. A spectacle hinge screw, a watch case back or a miniature connector may need a fraction of a newton-meter. Writing 8 cN·m is clearer and safer on a specification than 0.08 N·m, where a missing zero changes the value tenfold.

Because centi is a plain SI prefix, the conversion is exact and involves no measurement standard — just a shift of the decimal point.

Where Centinewton-meters Are Used

• Precision instruments and optics — small retaining screws.
• Electronics assembly — miniature terminal screws and board standoffs.
• Watchmaking and eyewear.
• Torque screwdriver ratings in the sub-newton-meter range.

Converting Centinewton-meter

Pound-foot to Centinewton-meter Conversion Table

Here are some quick reference conversions from Pound-foot (lbf-ft) to Centinewton-meter (cNm):