# Surface area of a sphere calculator

Instructions for using the calculator

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

Just enter the radius of the sphere

Then click on the button that says calculate

If you know the diameter, but not the radius, just divide the diameter by 2 to get the radius

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

Enjoy the calculator!

Enter r, which is the radius of the sphere:

The surface area of the sphere is :

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