Normal Force
Estimate support force on flat or inclined surfaces. Free online calculator with formulas and step-by-step solutions.
Key formula
N = mg or N = mgcos(theta)
About this tool
Normal force is the support force a surface exerts perpendicular to itself. This page keeps N = mg on a flat floor and N = mg cosθ on a ramp visible so you can pick the right model instead of treating every surface as N = mg.
How to use this calculator
- Choose the variable you want to solve for and confirm which values are already known.
- Enter inputs in consistent units before calculating so the formula is applied correctly.
- Check whether the result is physically reasonable by comparing it with the size of the inputs.
- Use the step-by-step breakdown to see how the equation was rearranged and evaluated.