Estimate how many boxes, bags, or rolls you need to cover an area. Enter the area, the coverage per unit, and a waste factor.
Units to Buy
— units
Boxes, bags, or rolls, rounded up.Usage Tip
Read the coverage straight off the package rather than guessing — manufacturers list square feet per box or bag, often at a stated thickness. Round up and keep one spare unit.
THE MATH
Area with waste = Area × (1 + waste%)
Units = round up (area with waste ÷ coverage per unit)
Units = round up (area with waste ÷ coverage per unit)
Coverage per unit is how much area one box, bag, or roll covers — it is printed on the package (for example a box of flooring covers about 20 to 30 sq ft).
This rounds up to whole units, since you buy boxes and bags, not fractions.
This rounds up to whole units, since you buy boxes and bags, not fractions.
Check the actual coverage on your specific product; it varies a lot by tile size, plank width, and bag weight.
Coverage on bagged goods (mortar, grout, self-leveler) also depends on thickness — a thicker application covers less area per bag.
Buy from the same lot and keep a spare; reordering later risks a color or batch mismatch.
Coverage on bagged goods (mortar, grout, self-leveler) also depends on thickness — a thicker application covers less area per bag.
Buy from the same lot and keep a spare; reordering later risks a color or batch mismatch.