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Formula for Cubic Feet
Length
(ft, inch)
Width ft
(ft, inch)
Height
(ft, inch)


     

Shipping Container Example:
40 ft Standard Container: Internal measurements: Lenght 39ft 5inch, Width 7ft 6inch, Height 7ft 10inch
Cubic ft volume = 2315.73 cu ft

Hand Calc Method:
- Convert Lenght in feet to inches 39ft = 39 * 12 = 468 inches
- Add on the specified 5 inches = 468 + 5 = 473 inches  -> Total Lenght = 473in

- Convert Width to Inches 7ft, 6in = 84 + 6in -> Total Width = 90in
- Convert Height to Inches 7ft,10in = 84 + 10in -> Total Height = 94in

- Calculate the volume in cubic inches = 473 * 90 * 94 = 4001580 cubic inches
- Calculate the volume in Cubic feet = 3957.12/(12* 12* 12) = 2315.73 cft

References and Calculators:
Cubic Ft Cylinder
Cubic Inch Calculator
Piston Speed
Percent Error Calculator
Auto Math Handbook, J Lawlor, ISBN-13: 978-1557880208.