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MotionLab
How much a material has stretched or compressed, relative to its original size.
Because it's a ratio of two lengths, strain has no units — it's often expressed as a percentage or in microstrain (millionths) for very small deformations, since raw decimal strain values are typically tiny for most structural materials under normal loads.
Plotting stress against strain for a material produces a stress-strain curve, which reveals key properties like stiffness (Young's modulus), yield point, and ultimate strength — strain alone is only half the picture.
Strain
0.002
ε = ΔL / L (dimensionless)
What you entered
ε = ΔL ÷ L
0.002 ÷ 1= 0.002Result
Strain: 0.002
A 0.002m change over 1m original length is a strain of 0.002.