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.

