Rectangular Prism Surface Area Calculator

Where l is the length, w is the width, and h is the height.

Calculate the surface area of a rectangular prism with length 8 cm, width 5 cm, and height 3 cm:

Result: 158 cm²

1. Enter the length of the prism
2. Enter the width of the prism
3. Enter the height of the prism
4. Click "Calculate" to see the surface area

• Volume: $l \\\\times w \\\\times h$
• Diagonal: $\\\\sqrt{l^2 + w^2 + h^2}$
• Perimeter of base: $2(l + w)$

• Box and packaging calculations
• Room painting and wallpapering
• Shipping container calculations
• Construction and architecture

What if all sides are equal? The prism is a cube with surface area $6s^2$.

How is this different from volume? Surface area is the total area of all 6 faces (2D); volume is the space inside (3D).

Can I calculate from volume? No, you need all three dimensions separately.

What about an open rectangular prism? Subtract the area of the missing face(s).