# Stress Calculator

> Calculate stress step by step: σ = F ÷ A.

Page: https://freecalculator.tech/tools/stress-calculator
Last reviewed: 2026-11-03

## Formula

σ = F ÷ A. N ÷ mm² = MPa.

- Positive force means tension; negative means compression.
- Area must be above zero.
- Assumes stress is uniform over the section.
- σ = F ÷ A. N ÷ mm² = MPa.
- Inputs used: Axial force, Cross-sectional area.

## Inputs

- Axial force
- Cross-sectional area

## Worked example: 10 kN on 100 mm²

A rod in tension.
1. σ = 10,000 ÷ 100 = 100 MPa.

## Common questions

### Is the result safe?

Compare it with the material's allowable stress, which includes a safety factor from your design code. This calculator does not choose one.

### Why N/mm²?

One newton per square millimetre equals one megapascal, which keeps engineering numbers manageable.

### Does this work for bending?

No. Bending produces varying stress; use the bending stress calculator.

### How do I use the Stress Calculator?

Enter the required values for Axial force, Cross-sectional area. The calculator applies the formula on this page and shows the main result with any supporting breakdown so you can check the arithmetic.

### What formula does the Stress Calculator use?

σ = F ÷ A. N ÷ mm² = MPa. The visible formula section above lists the calculation path and the edge cases the page handles, so the result can be checked without relying on the form alone.

### Can the Stress Calculator be used for exact decisions?

Use it as a calculation aid, not as a substitute for checking the underlying rule, contract, policy, or professional advice that applies to your situation. When a result depends on local rules, personal details, prices, or dates, enter those values yourself and confirm them before acting.

## Limitations and assumptions

- Uniform axial stress only.
- Ignores stress concentrations at holes and notches.
- No safety factor applied.
- Results are estimates for planning and learning. Real designs, installations and bids must be checked by a qualified, licensed professional against the codes that apply where you work.
- The result depends on the values you enter for this stress calculator; it does not supply missing rates, rules, prices, dates, or assumptions for you.

## Sources

- OpenStax (Rice University) — https://openstax.org/details/books/university-physics-volume-1

## Cite this page

- APA: Free Calculator. (2026, November 3). Stress Calculator. https://freecalculator.tech/tools/stress-calculator
- MLA: "Stress Calculator." Free Calculator, 3 Nov. 2026, https://freecalculator.tech/tools/stress-calculator.
- Link: Stress Calculator — Free Calculator, https://freecalculator.tech/tools/stress-calculator