How to use this calculator
- Enter the applied force in newtons.
- Enter the cross-sectional area.
- Read the stress in megapascals.
What your result means
Stress is internal force per unit area (σ = F ÷ A), in megapascals — the value you compare against a material’s yield or ultimate strength, staying well below with a safety factor. This is direct axial stress only, not bending or shear.
The invisible strain inside every bridge and bone
Stress is force spread through the material itself — the internal push-back that decides whether a beam holds or snaps. Engineers keep working stress safely below the point where a material yields, using a margin called the factor of safety.
It’s the same idea whether you’re sizing a steel column or wondering why a paperclip breaks after enough bends: exceed the limit and structure fails.
How it works
Stress is the internal force per unit area within a material under load. It's the same idea as pressure but inside a solid. Engineers compare it against a material's yield and ultimate strength to check a part won't deform or fail. One newton per square millimetre equals one megapascal.
Formula
Frequently asked questions
Is stress the same as pressure?＋
The units are identical (Pa), but stress refers to internal forces in a solid while pressure usually refers to fluids or external loads.
What is yield strength?＋
The stress at which a material starts to deform permanently. Keep working stress safely below it using a factor of safety.