Grout Calculator. Tiling a floor or wall and not sure how much grout to buy? The Grout Calculator estimates the exact amount of grout needed based on your tile dimensions and project size. Enter your tile length, width, thickness, joint width, and installation area, then select a waste factor to get your grout needed in pounds — plus total tiles, grout volume, and a final grout with waste factor figure so you never run short. Also try the Asphalt Calculator.
Measure the actual tile surface, not including any beveled edges. Use a ruler or measuring tape to get length and width in inches. Thickness should be measured from the back of the tile to the surface. See also our Concrete Driveway Cost Calculator.
Most ceramic tiles use 1/8 inch (0.125 inch) joints, while larger tiles may use 1/4 inch joints. Natural stone tiles often require wider joints of 1/4 to 3/8 inches.
A waste factor accounts for mixing losses, cleanup, and potential mistakes during installation. It's better to have slightly more grout than to run short during your project.
Most cement-based grouts weigh approximately 0.06 to 0.08 pounds per cubic inch. This calculator uses an average density for standard sanded grout.
Yes, this calculator works for most cement-based grouts including sanded and unsanded varieties. Epoxy grouts have different coverage rates and should use manufacturer specifications.
For mixed tile sizes, calculate grout needed for each size separately using their respective areas, then add the totals together for your complete project requirements.
Break complex areas into rectangular sections, calculate each section separately, then sum the results. Don't forget to subtract areas for fixtures or openings. You might also find our Concrete Steps Calculator useful.