Friction Coefficient Calculator

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Choose which quantity to calculate. The remaining fields provide the inputs.
Kinetic friction acts while an object is already moving; static friction is the maximum force resisting the start of motion. Static coefficients are usually higher.
The measured friction force opposing motion.
N
The perpendicular (normal) force pressing the surfaces together.
N
Coefficient of frictionModerate friction
0.3

Dimensionless ratio of friction force to normal force

Friction force30N
Normal force100N
Angle of friction16.7deg
0.3
Very low (Teflon/ice)<0.05Low (lubricated)0.05-0.2Moderate (dry metals/wood)0.2-0.5High (rubber/brake pad)0.5-0.8Very high (grip surfaces)0.8+

Coefficient of friction: 0.3000 (moderate friction)

  • The angle of friction for this surface pair is 16.7 deg - an object on a slope steeper than this will begin to slide under its own weight.
  • The friction force is 30.0% of the normal force pressing the surfaces together.
  • This range covers well-lubricated bearings, smooth steel pairs, and wet surfaces.

Next stepAlways verify against measured values for your specific surface finish, temperature, and lubrication condition - tabulated values are starting-point estimates only.

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