My US-spec cable has a minimum breaking force of 5,000 lbf. My European safety factor calculation needs this in kN — what's the number?

5,000 lbf × 4.4482 = 22,241 N = 22.24 kN. Apply your safety factor to 22.24 kN for the metric design calculation.

I'm entering a spring constant of 120 lbf/in into a metric simulation. How do I convert that to N/m?

Multiply by 175.127: 120 lbf/in × 175.127 = 21,015 N/m. This combines the lbf-to-N factor with the inch-to-metre factor in one step.

My bathroom scale reads in lbs. Is that lbf?

Effectively yes, on Earth. Scales measure the gravitational force your body exerts, which equals your mass in lbs times standard gravity. For everyday use, lb on a scale ≈ lbf. The distinction matters only in high-precision or off-Earth contexts.

A spec gives 1,874 lbf. What is that in newtons?

1,874 × 4.4482 ≈ 8,336 N, about 8.34 kN.

Pound-Force (lbf) to Newtons Converter

Enter a value to instantly convert between force units.

From

Precision4 dp

1 Pound-Force = 4.4482 Newton

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

N = lbf × 4.4482216153

When US-manufactured equipment enters a metric engineering environment — a European factory, an ISO-certified test lab, an SI-unit FEA model — every lbf rating must become newtons. Tensile strength tables from US steel suppliers give values in ksi (kips per square inch), which is a stress, so they need a pressure conversion (1 ksi = 6.894757 MPa) rather than this one. Any time a US-designed component must meet metric-spec certification, this conversion is the starting point.

Source: NIST SP 811, Table B.8

Reviewed by the Convert Calc editorial team · Last reviewed: 2026-10-06 · see our methodology

Frequently Asked Questions

Real-World Examples

The weight force of roughly 454 g (1 lb) of mass — a handy reference for calibrating small bench-top load cells against SI standards.

1 lbf = 4.448 N

A 150 lbf force from a US spec, entered as about 667 N in a metric design.

150 lbf = 667.2 N

One US ton-force (2,000 lbf) in newtons, about 8.9 kN.

2000 lbf = 8896.4 N

A 68 lbf pull measured on a heavy door, recorded as about 302 N for a metric test report.

68 lbf = 302.5 N

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

Pound-Force (lbf) to Newtons Converter

Key Formulas

Formula

Frequently Asked Questions

Real-World Examples

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