Cuboid Surface Area SA = 2(lw+lh+wh). Length Width Height Surface area 52 Step-by-step with your numbers: 1. Values used: 2. Length = 4 3. Width = 3 4. Height = 2 5. Surface area = 52 Did we solve your problem today? 👍 Yes 👎 No Thanks for the feedback! Cuboid surface. FAQ Cube? SA = 6a². Related calculators Surface Area of a Cube Calculator SA = 6a². Rectangular Prism Calculator Volume, surface area and diagonal of a box.