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Concrete, Mulch and Paint Calculator

Enter the dimensions of a slab, a garden bed or a room and get the quantity to buy, in cubic yards, bags or gallons.

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The maths

Concrete: length × width × thickness in feet gives cubic feet; divide by 27 for cubic yards. An 80 lb bag of mix makes about 0.60 cubic feet and a 60 lb bag about 0.45. Order about 10% extra for uneven ground and spillage.

Mulch and gravel: area × depth in feet gives cubic feet. A depth of 2 to 3 inches suits most beds. Bags are usually 2 or 3 cubic feet; bulk is sold by the cubic yard.

Paint: wall area is the room's perimeter × wall height, less about 20 sq ft per door and 15 sq ft per window. One gallon covers about 350 sq ft per coat on smooth, primed walls. Rough or unprimed surfaces take more.