# Surface area of a sphere 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. Enter r, which is the radius of the sphere:

The surface area of the sphere is :

Instructions for using the calculator

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!

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