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Total surface area of a Cuboid (Rectangular box)
TSA = 2(lb + bh + hl)
Where: TSA = Total surface area, b = breadth, h = height, l = length
Use the same units for all lengths (e.g. all in cm); areas come out in cm², volumes in cm³.
Solved example
Given: b = 7, h = 5, l = 10
Find: TSA_ (Total surface area)
- Formula: TSA = 2·b·h + 2·b·l + 2·h·l
- Substitute the values: TSA = 2·10·5 + 2·10·7 + 2·5·7
- Result: TSA = 310
Answer: TSA_ = 310
Calculator
How to calculate Total surface area of a Cuboid (Rectangular box)
- Write down the formula: TSA = 2(lb + bh + hl).
- Note the known values (b, h, l).
- Substitute them and simplify to find TSA_.
- Use the calculator above to solve for any letter.
Frequently asked questions
What is the formula for Total surface area of a Cuboid (Rectangular box)?
The formula is TSA = 2(lb + bh + hl), where TSA = Total surface area, b = breadth, h = height, l = length.
What is Total surface area of a Cuboid (Rectangular box) when b = 7, h = 5, l = 10?
TSA_ = 310. Substitute the values into TSA = 2(lb + bh + hl) and simplify.