Measure deformation and material response with confidence. See graphs, exports, and example datasets before decisions. Built for quick checks, learning, comparison, and better reporting.
The line shows the stress-strain relationship using your entered modulus, or a derived line from the calculated point.
Use this sample table to understand typical calculator outputs before entering your own measurements.
| Material | Original Length (m) | Final Length (m) | Engineering Strain (%) | Force (kN) | Stress (MPa) |
|---|---|---|---|---|---|
| Steel Rod | 2.000 | 2.004 | 0.2000 | 25 | 125.00 |
| Aluminum Bar | 1.500 | 1.503 | 0.2000 | 8 | 80.00 |
| Copper Wire | 1.000 | 1.0015 | 0.1500 | 2 | 63.66 |
| Concrete Core | 0.500 | 0.4998 | -0.0400 | 30 | -15.00 |
| Glass Strip | 0.800 | 0.8010 | 0.1250 | 1.5 | 30.00 |
Engineering strain is best for quick design checks. True strain is better for larger deformations. Stress and strain together help estimate stiffness and compare real measurements against ideal elastic behavior.
Strain measures relative deformation. It compares the change in length to the original length. Because it is a ratio, strain has no unit. Positive values usually indicate tension, while negative values usually indicate compression.
Engineering strain uses the original length as the reference. The formula is (L − L0) / L0. It is simple, fast, and widely used for introductory mechanics and many practical calculations.
True strain uses the continuously changing length during deformation. Its formula is ln(L / L0). It becomes more helpful when deformation is larger and you want a closer representation of actual material behavior.
Force and area are used to calculate stress. Stress, combined with strain, helps compare materials, estimate apparent stiffness, and build the stress-strain graph shown by the calculator.
Yes. Choose compression and enter the measured final length. The calculator will report negative stress and strain values where appropriate, making it useful for both shortening and stretching cases.
The calculator still computes elongation, engineering strain, true strain, and stress. Young’s modulus mainly adds elastic prediction values and helps draw a theory-based line on the graph.
Predicted elongation assumes ideal linear elastic behavior, constant area, and accurate inputs. Real materials may yield, slip, heat up, or include measurement error, so actual values can differ.
The calculator supports common length, area, and force units. All values are converted internally to SI units, then summarized in a readable format for easier checking and reporting.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.