I need a replacement spring rated at 50 ozf. A metric supplier lists springs in kgf. What do I order?

50 ozf ÷ 35.274 ≈ 1.42 kgf. Order a spring rated at 1.4–1.5 kgf. Also verify the spring constant (stiffness per unit length) matches — same force rating doesn't guarantee same behavior if the travel distance differs.

My industrial spring is rated 500 kgf. How many ounces-force is that, and is ozf even appropriate for this?

500 × 35.274 = 17,637 ozf ≈ 1,102 lbf. At that scale, you'd normally express it in lbf or kN rather than ozf. Ounce-force is practical only for sub-10 kgf loads where the numbers stay below ~350 ozf.

Is there a quick mental math for kgf to ozf?

Roughly: 1 kgf ≈ 35 ozf. Multiply kgf by 35 for a quick estimate. The exact factor is 35.274, so you're accurate to within 0.8%.

Can I use this converter for pressure (kgf/cm² to ozf/in²)?

Not directly. Converting pressure requires combining both the force conversion (kgf to ozf, ×35.274) and the area conversion (cm² to in², ×0.155). The net pressure factor is 35.274 × 0.155 ≈ 5.47 ozf/in² per kgf/cm².

Kilogram-Force (kgf) to Ounce-Force (ozf) Converter

Enter a value to instantly convert between force units.

From

Precision4 dp

1 Kilogram-Force = 35.274 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 = kgf × 35.2739619

Light-duty precision instruments — postal scales, spring gauges, force indicator dials — are often rated in ounce-force in US and UK markets, while the loads they measure come from metric-specified processes. A kgf-rated clamping force on an Asian production line must be verified against an ozf-rated US quality gauge. Similarly, replacement springs for precision instruments sourced from metric catalogs (kgf ratings) must match the original imperial (ozf) specs.

Source: NIST SP 811, Table B.8

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

Frequently Asked Questions

Real-World Examples

A 1 kgf clamping load — 35.3 ozf, which matches a postal scale rated at 36 ozf max, giving a small but acceptable margin.

1 kgf = 35.274 ozf

A 100 gf (0.1 kgf) spring tension in a precision instrument — 3.5 ozf, a value directly readable on a clock-spring tension gauge.

0.1 kgf = 3.527 ozf

A 5 kgf kitchen scale capacity — 176 ozf, equivalent to about 11 lbf, for labeling compliance in dual-unit markets.

5 kgf = 176.37 ozf

One pound-force (1 lbf = 16 ozf) expressed in kgf — the bridge value when reconciling kgf fixture specs with lbf-based US tooling.

0.454 kgf = 16 ozf

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

Kilogram-Force (kgf) to Ounce-Force (ozf) Converter

Key Formulas

Formula

Frequently Asked Questions

Real-World Examples

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