Background

Force is fundamental. Newton (SI): force to accelerate 1 kg at 1 m/s². Pound-force (US engineering). kgf (non-SI, still used). 1 kg mass exerts ~9.81 N on Earth.

Mass vs Force

1 kg mass exerts 9.81 N force due to gravity = 1 kgf. In space, same mass = zero force.

N and lbf in Engineering

US specs use lbf; international uses N. 1 lbf = 4.448 N.

How to Use This Calculator

1. Select 'Force'

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2. Select your source unit

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3. Enter the value

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4. Select your target unit

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Applications

Structural Engineering

Office floor: 2–3 kN/m² (40–60 lbf/ft²). International projects need both units.

Materials Testing

Tensile strength: MPa (N/mm²) or psi (lbf/in²). Convert for international material comparisons.

Aerospace and Automotive

Aerodynamic drag: 300–500 N at highway speed. Convert to lbf for US specs.

Frequently Asked Questions