Calculate box, cuboid or rectangular prism surface area with 2(lw + lh + wh). Convert units and reverse solve a missing dimension.
This surface area of a rectangular cuboid calculator finds the total outer area of a box, rectangular prism, tank, or container from its length, width, and height. It uses the standard formula 2(lw + lh + wh) and also supports reverse solving for a missing dimension.
2(lw + lh + wh)
It is useful for geometry homework, wrapping and packaging estimates, paint or material coverage, and any calculation where you need the full outside area of a rectangular 3D shape instead of its volume.
$$A= 2(lw + wh + lh)$$
The formula is 2(lw + lh + wh), where l is length, w is width, and h is height. It adds the areas of all six rectangular faces.
l
w
h
You usually need length, width, and height. If the calculator is in reverse mode, it can also solve one missing dimension when the surface area and the other two dimensions are known.
Yes. In this context, cuboid, rectangular prism, and box-shaped solid all describe the same type of right-angled 3D shape.
Surface area measures the total outside area of the shape, while volume measures how much space it holds inside. Packaging and covering problems usually need surface area, while capacity problems need volume.
It is useful for geometry, packaging, material estimates, painting, insulation, cladding, and any task where you need the outer area of a rectangular tank, container, or box.
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