Question 1

How many gallons of paint do I need for a 12×15 bedroom?

Accepted Answer

For a standard 12 ft × 15 ft bedroom with 8 ft ceilings, one door, and two windows, the walls need about 2 gallons of interior latex for two coats. Add the ceiling and you would need 3 gallons. Use our Paint Calculator for an exact estimate.

Question 2

How many bags of concrete do I need for a 10×10 patio at 4 inches thick?

Accepted Answer

A 10 ft × 10 ft slab at 4 inches thick is about 30.9 cubic feet. With a 10% waste allowance that rises to roughly 34 cu ft, which works out to about 75 bags of 60 lb concrete. For anything larger than about 20 bags, ready-mix by the cubic yard is usually more cost-effective.

Question 3

How many boxes of flooring do I need for a 14×16 room?

Accepted Answer

A 14 ft × 16 ft room is 224 sq ft. At a typical 10% waste factor that becomes about 246 sq ft. Most laminate boxes cover 22 sq ft, so you would need 12 boxes. Always buy a few extra for on-site cuts and future repairs.

Material Math Challenge

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