My test equipment is rated at 100 ozf maximum load, but my calculations are in newtons. What's the capacity in SI units?

100 ozf ÷ 3.597 ≈ 27.8 N. So your equipment handles up to roughly 28 N. Keep a safety margin — don't test right at the limit.

I'm selecting a servo motor for a robotic gripper. The catalog lists stall torque in oz·in (ounce-inch). My design force is 5 N at 3 cm arm length. Does the servo fit?

Your required torque = 5 N × 0.03 m = 0.15 N·m = 0.15 × 141.61 ≈ 21.2 oz·in. Any servo rated above 21.2 oz·in stall torque will work, with safety margin depending on your application.

A fishing rod blank is rated for a line weight of 3–5 ozf. My lure weighs 14 g. Can I use it?

14 g weight = 0.014 × 9.81 ≈ 0.137 N = 0.137 × 3.597 ≈ 0.49 ozf. That's well within the 3–5 ozf rating — the rod is suitable.

Is ounce-force the same as ounce?

No. Ounce (oz) is mass (28.35 g). Ounce-force (ozf) is the gravitational force of 1 oz at Earth's surface (= 0.278 N). Scale manufacturers sometimes drop the 'f' — check the context to determine whether force or mass is meant.

Newtons to Ounce-Force (ozf) Converter

Enter a value to instantly convert between force units.

From

Precision4 dp

1 Newton = 3.5969 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 = N × 3.5969471223

Precision instrument manufacturers — clock spring suppliers, postal scale makers, small servo catalog producers — frequently rate their products in ounce-force because the numbers are human-scale for light loads. When an engineer's calculation gives 2.5 N and the spring catalog shows stiffness in ozf, or when a servo motor's holding torque is specified in ozf·in, this conversion is the everyday bridge between SI design calculations and imperial parts catalogs.

Source: NIST SP 811, Table B.8

Last reviewed: 2026-06-11 · see our methodology

Frequently Asked Questions

Real-World Examples

Definition anchor: 1 ozf = 0.278 N. A small spring rated at 1 ozf, like a keyboard return spring, exerts 0.278 N of restoring force.

0.278 N = 1 ozf

Output force of a small hobby servo at stall — commonly expressed in ozf in the product datasheet to give a tangible sense of grip strength.

1 N = 3.597 ozf

One pound-force (1 lbf = 16 ozf) — a useful anchor when converting between the two imperial force units via newtons.

4.448 N = 16 ozf

A small tension scale rated at 100 ozf capacity — the force limit that must not be exceeded when calibrating it against a newton-reading load cell.

27.8 N = 100 ozf

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

Newtons to Ounce-Force (ozf) Converter

Key Formulas

Formula

Frequently Asked Questions

Real-World Examples

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