Stress Calculator
Calculate normal (axial) stress from force and cross-sectional area, in MPa or ksi.
Compare the calculated stress against the material’s yield strength to determine whether the design is safe. Always verify critical structural calculations with a qualified engineer.
How it works
- 1Enter the axial force and the cross-sectional area carrying it.
- 2The calculator applies σ = F ÷ A and converts the result to MPa or ksi.
- 3Compare the stress against the material’s yield strength to judge whether the part is safe.
Use cases
- Checking whether a rod, bolt, or cable can carry an axial load.
- Sizing a member to keep stress below the allowable limit.
- Teaching the difference between tensile and compressive stress.
Frequently asked questions
What is the stress formula?
Normal stress σ equals force divided by cross-sectional area: σ = F ÷ A. A 50 kN force over a 500 mm² area gives 100 MPa.
What units is stress measured in?
The SI unit is the pascal (Pa = N/m²). Engineering values are usually quoted in megapascals (MPa = N/mm²) or, in US units, pounds per square inch (psi) and ksi.
What is the difference between tensile and compressive stress?
Tensile stress stretches a material (positive force) while compressive stress squeezes it. Both use σ = F/A; only the direction of the force differs.
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