Enter the current size of the tube or object and the heat shrink ratio into the calculator to determine the heat shrink size.

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## Heat Shrink Size Formula

The following formula is used to calculate a heat shrink size.

NS = OS / HSR

- Where NS is the new size
- OS is the original size
- HSR is the heat shrink ratio (usually 2:1 or 3:1) this is determined by the thermal expansion of the material

## Heat Shrink Size Definition

A heat shrink size is a size at which an object constricts to after being exposed to heat, hence the name heat shrink.

## Heat Shrink Size Example

How to calculate a heat shrink size?

**First, determine the original size.**Measure the original size of the tube or object.

**Next, determine the heat shrink ratio.**This is the ratio of the original size to new size after hat is applied.

**Finally, calculate the heat shrink size.**Calculate the new size of the heat shrink using the equation above.

## FAQ

**What is a normal heat shrink ratio?**

A normal heat shrink ratio is typically 2:1 or 3:1 for many materials.