What is the unit weight of concrete in kip/ft^3?

• A. 0.15 kip/ft^3
• B. 0.20 kip/ft^3
• C. 0.25 kip/ft^3
• D. 0.30 kip/ft^3

Answer: (A)

Unit weight means weight per volume, and for normal-weight concrete the typical value used in design is about 150 pounds per cubic foot. Converting to kip per cubic foot involves dividing by 1000 since 1 kip = 1000 pounds. So 150 lb/ft^3 equals 0.15 kip/ft^3. This matches the standard design value used for most reinforced concrete structures. The other options correspond to weights that would come from unusually light or heavy concretes, so they don’t fit typical practice.