My postal scale reads in ounces, but the equipment spec asks for pounds-force capacity. How do I convert?

Divide ounce-force by 16 to get pounds-force. For example, an 80 ozf scale has 5 lbf capacity. This simple 16:1 ratio matches the imperial weight conversion (16 ounces = 1 pound). For SI conversions, see [newtons to ounces-force]({/force/newtons-to-ozf/}).

A fishing line is rated '10 lb test.' Does that mean 10 lbf, or is it different?

In fishing, 'lb test' means the line can hold about 10 lbf before breaking. It's roughly the force of a 10 lb weight hanging straight down. The same as saying 160 ozf test weight.

Why do precision instruments use ounce-force instead of just grams or newtons?

Ounce-force is intuitive in imperial countries—it's the force of 1 ounce at Earth's surface. For delicate instruments, springs, and scales historically built in the US or UK, ozf remains the standard specification unit.

Is 'ounce' (oz) the same as 'ounce-force' (ozf)?

No. Ounce (oz) is mass (28.35 grams). Ounce-force (ozf) is the gravitational force of 1 oz at Earth's surface (~0.278 N). Always use 'ozf' to clarify you mean force, not weight.

Pounds-Force (lbf) to Ounces-Force (ozf) Converter

Enter a value to instantly convert between force units.

From

Precision4 dp

1 Pound-Force = 16 Ounce-Force

Key Formulas

Newton → Pound-Force

lbf = N × 0.224809

Pound-Force → Newton

N = lbf × 4.44822

Kilogram-Force → Newton

N = kgf × 9.80665

Newton → Kilogram-Force

kgf = N × 0.101972

Formula

ozf = lbf × 16

Postal scales, spring testers, and light-duty precision instruments often measure force in ounce-force (ozf), while engineering equipment or datasheets may report loads in pounds-force (lbf). When specifying scale capacity or comparing precision test machines rated differently, this simple 16:1 conversion is essential.

Source: NIST SP 811, Table B.8

Frequently Asked Questions

Real-World Examples

Definition. 1 pound-force equals 16 ounce-force by weight—the fundamental equivalence in imperial force measurement.

1 lbf = 16 ozf

A fishing line rated at 5 lbf breaking strength equals 80 ozf—the test weight marking on the spool. Anglers use these interchangeably.

5 lbf = 80 ozf

A precision spring with 0.5 lbf rated force equals 8 ozf. A clock or instrument designer consults this value when sourcing replacement springs.

0.5 lbf = 8 ozf

A postal scale maxing out at 10 lbf equals 160 ozf capacity—a common threshold for office mail sorting equipment.

10 lbf = 160 ozf

newtons to lbf lbf to newtons kgf to newtons newtons to kgf kn to newtons newtons to kn

Pounds-Force (lbf) to Ounces-Force (ozf) Converter

Key Formulas

Formula

Frequently Asked Questions

Real-World Examples

Related Converters