Surface Area of a Cube Calculator

Use this calculator to find the surface area of a cube when you know its side length. Surface area is the total area of all 6 faces (in square units).

In the diagram, each edge is labeled a.

Step-by-step method

1. Identify what is given.
2. Write the formula.
3. Substitute the value and calculate the surface area.

Formula:

Example 1: a = 4

Step 1 - Identify what is given.

In this problem: The given side length is a = 4.

Step 2 - Write the formula.

In this problem: Use the cube surface area formula: SA = 6a².

Step 3 - Substitute the value and calculate the surface area.

In this problem: Substitute a = 4: SA = 6 × 4² = 96.

Final answer: SA = 96

Example 2: a = 2.5

Step 1 - Identify what is given.

In this problem: The given side length is a = 2.5.

Step 2 - Write the formula.

In this problem: Use the cube surface area formula: SA = 6a².

Step 3 - Substitute the value and calculate the surface area.

In this problem: Substitute a = 2.5: SA = 6 × 2.5² = 37.5.

Final answer: SA = 37.5