Surface Area of a Cuboid Calculator

Use this calculator to find the surface area of a cuboid when you know its length, width, and height. Surface area is the total area of all faces (in square units).

In the diagram, the dimensions are labeled l, w, and h.

Step-by-step method

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

Formula:

Example 1: l = 4, w = 3, h = 2

Step 1 - Identify what is given.

In this problem: The given dimensions are l = 4, w = 3, h = 2.

Step 2 - Write the formula.

In this problem: Use the surface area formula: A = 2(lw + lh + wh).

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

In this problem: Substitute l = 4, w = 3, h = 2: A = 2((4×3) + (4×2) + (3×2)). Then A = 2(12 + 8 + 6) = 52.

Final answer: A = 52

Example 2: l = 6.5, w = 2, h = 1.5

Step 1 - Identify what is given.

In this problem: The given dimensions are l = 6.5, w = 2, h = 1.5.

Step 2 - Write the formula.

In this problem: Use the surface area formula: A = 2(lw + lh + wh).

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

In this problem: Substitute l = 6.5, w = 2, h = 1.5: A = 2((6.5×2) + (6.5×1.5) + (2×1.5)). Then A = 2(13 + 9.75 + 3) = 51.5.

Final answer: A = 51.5