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`epsilon = ( DeltaL )/ "L" `

Enter a value for all fields

The **Strain** calculator computes the ratio of change in length to original length.

**INSTRUCTIONS:** Choose units and enter the following:

- (
**L**) Initial Length - (
**ΔL**) Change in Length

**Strain (S):** The calculator return the strain as a real number. However, this can be automatically converted to percentage via the pull-down menu.

This Strain equation computes engineering strain from the simplest definition, where Strain is simply a ration of the change in length to the original length. The formula for strain is:

ε = ΔL / L

where:

- ε is strain
- ΔL is the change in elongation.
- L is the original length

Engineering strain is defined in terms of the change in length of a physical element (ΔL) divided by the original length of the physical element (L).^{1}

- ^ Fundamentals of Engineering. 8th edition, 2nd Revision. National Council of Examiners for Engineering and Surveying (NCEES) - 2001. ISBN 978-1-932613-59-9. pg 33