Ounce-force (ozf)

US & ImperialCurrent unit

One sixteenth of a pound-force (0.278 N).

1 ounce-force = 0.278013851 newtons (approximately).

About the ounce-force

Defined as a sixteenth of a pound-force, the ounce-force is a small US customary unit of force. The pound-force is 0.45359237 kg times standard gravity of 9.80665 m/s2, which gives 4.4482216 N, so the ounce-force comes to about 0.2780139 N. NIST lists the same factor, and it is the figure used here.

The name borrows from the avoirdupois ounce, so the unit measures the weight of that much mass under standard gravity rather than a separate invented quantity. Twelve ounces-force is three quarters of a pound-force, about 3.34 N, and sixteen make a pound-force. NIST advises against using such non-SI units in its own publications, and the metric equivalent for light forces is the millinewton, since one ounce-force is roughly 278 mN.

Sources: NIST SP 811, Appendix B.8; Wikipedia: Pound (force)

Ounce-force conversion chart

1 ounce-force expressed in every other force unit:

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