Convert Torque from Pound-feet to Decinewton-meters (lbf-ft to dNm)

Pound-foot to Decinewton-meter Conversion Formula

Example

Let's convert 5 Pound-foot (lbf-ft) to Decinewton-meter (dNm).

Using the formula:

Therefore, 5 Pound-foot (lbf-ft) is equal to 67.7909 Decinewton-meter (dNm).

How many pound-feet are in one decinewton-meter? One Decinewton-meter (dNm) contains 0.073756212116965551424 Pound-feet (lbf-ft) — the inverse of the factor above. Multiplying by 13.55818 takes you from pound-feet to decinewton-meters; multiplying by 0.073756212116965551424 brings you back.

Put in words: one pound-foot equals 13.55818 decinewton-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 Decinewton-meter (dN·m)?

A decinewton-meter (dN·m) is one tenth of a newton-meter.

• 1 dN·m = 0.1 N·m
• 1 N·m = 10 dN·m

A Narrow but Real Use

The decinewton-meter sits between the newton-meter and the centinewton-meter, and it is the least common of the three. Where it does appear, it is usually because a measuring instrument's range happens to fall there and whole numbers read more cleanly than decimals.

Its most established use is in rubber and polymer testing: the torque curves produced by a moving-die rheometer are conventionally plotted in dN·m, and the standard test reports quote minimum and maximum torque in that unit.

Where Decinewton-meters Are Used

• Rubber rheometry — cure curves under ASTM D5289 and related standards.
• Materials laboratories reporting small torque measurements.
• Some torque measurement instruments with a dN·m display range.

Because deci is a plain SI prefix, conversion is an exact decimal shift.

Converting Decinewton-meter

Pound-foot to Decinewton-meter Conversion Table

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