Coefficient of Friction Calculator

Calculate the coefficient of friction between surfaces

Friction Force (N):

Normal Force (N):

Or Calculate Normal Force From:

Mass (kg):

Gravity (m/s²):

Incline Angle (degrees) - Optional:

Friction Formulas

Coefficient of Friction: mu = F_friction / F_normal

Normal Force (flat): N = m * g

Normal Force (incline): N = m * g * cos(theta)

Static coefficient at angle of repose: mu_s = tan(theta)