Normal Force Calculator
Calculate the normal force on an object on a flat or inclined surface. Accounts for additional applied forces.
0° = flat surface
Enter mass and angle.
Normal Force Formulas
Flat surface: N = mg
Inclined surface: N = mg × cos(θ)
Inclined surface: N = mg × cos(θ)
Example: 10 kg on a 30° incline.
N = 10 × 9.81 × cos(30°) = 10 × 9.81 × 0.866 = 84.96 N
N = 10 × 9.81 × cos(30°) = 10 × 9.81 × 0.866 = 84.96 N
FAQ
Why is normal force important?
Normal force is used to calculate friction (f = μN). It's perpendicular to the surface and prevents objects from passing through it.
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Last updated: 2026-08-08