Sphere Surface Area Calculator

This tool accurately calculates the surface area of a sphere based on its inner radius value using a mathematical formula. You only need to enter the inner radius value of the sphere, and the tool will immediately calculate the corresponding surface area result for you, eliminating the need for complex mathematical operations or memorizing formulas.

How to Use the Tool

1. Enter the inner radius value of the sphere in the input box (please ensure to use the correct units, such as centimeters, meters, etc.).

2. Select the number of decimal places to retain for the calculation result. It is generally recommended to keep two decimal places.

3. Click the "Calculate" button, and the tool will begin the calculation.

4. Once the tool completes the calculation, the result will be displayed immediately. Note that the result does not include units of measurement.

5. To perform a new calculation, simply clear the current value and enter a new radius value.

Tool Calculation Principle

The formula used by this tool is: S = 4πr²;

S: Represents the surface area of the sphere.

π: Pi, approximately equal to 3.14159.

r: Represents the inner radius of the sphere.

This formula is the standard geometric formula for calculating the surface area of a sphere, ensuring the accuracy and reliability of the results.