# Surface area of a rectangular prism calculator Instructions for using the calculator

This surface area of a rectangular prism calculator below is very simple to use.

Just enter the length, the width, and the height of the rectangular prism

Then click on the button that says calculate

Do not enter numbers with a slash (/)! If you do, the wrong answer will be computed

Therefore, convert all fractions into decimals before entering numbers

Enter the length:

Enter the width:

Enter the height:

The surface area is :

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