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# Strain

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Equation / Last modified by KurtHeckman on 2018/11/16 18:01
`epsilon = `

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vCalc.Strain

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18939eed-0f09-11e4-b7aa-bc764e2038f2

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

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

- (
**L**) This is the initial length. - (
**ΔL**) This is the 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.

#### The Math / Science

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

#### Related Calculators

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}

# References

- ^ 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