Surface Area of a Cuboid Calculator
🧊 Volume & surface area (3D). Use the Surface area of a cuboid formula to find surface area, length, width, height: pick the value you want, type the others, and the answer updates as you go.
Pick the ○ next to the value you want to find, fill in the others, and it solves as you type.
What each letter means
| Quantity | Unit |
|---|---|
| Surface area | cm² |
| Length | cm |
| Width | cm |
| Height | cm |
Worked example
Find the surface area when Length = 5 cm, Width = 4 cm, Height = 3 cm.
Using SA = 2(lw + lh + wh): Surface area = 94 cm².
Frequently asked questions
What is the formula for Surface area of a cuboid?
SA = 2(lw + lh + wh).
What do the letters stand for, and what units are used?
Surface area in cm², Length in cm, Width in cm, Height in cm.
How do you calculate surface area?
Put the values into SA = 2(lw + lh + wh). For example, with Length = 5 cm, Width = 4 cm, Height = 3 cm, surface area = 94 cm².
Can I solve for a different value?
Yes. In the calculator above, pick the circle next to any value (surface area, length, width, height) and fill in the others: it rearranges the formula for you.
