Interior
Interior Calculators
Free calculators for tile, drywall, sheetrock, and backsplash projects. Get exact tile count, sheet count, and joint compound for any room or wall.
5 calculators · 4 reference pages
All Interior calculators
Tile Calculator
Plan a floor, shower, or kitchen backsplash.
Open calculatorDrywall Calculator
Use this drywall calculator to figure out exactly how many sheets, screws, and joint compound (mud) you need for a room remodel or new-build.
Open calculatorSheetrock Calculator
Use this sheetrock calculator to estimate the number of 4×8 panels, screws, and joint compound (mud) for any room or wall.
Open calculatorBacksplash Tile Calculator
Figure out exactly how much backsplash tile you need for a kitchen or bathroom.
Open calculatorTile Flooring Calculator
Calculate the tile flooring you need for a bathroom, kitchen, mudroom, or whole-house floor.
Open calculator
Reference
Quick answers for interior
Quick answer
How Much Does Drywall Cost?
Drywall costs $12–$18 per 4×8 sheet in 2026. Installed (with mud, tape, and labor) it runs $1.50–$3.50 per square foot.
Quick answer
How Many Tiles Are in a Square Foot?
It depends on tile size. A 12×12 inch tile is exactly 1 per ft². A 6×6 = 4 per ft². A 3×6 subway tile = 8 per ft². A 2×2 mosaic = 36 per ft². Larger tiles cover more area per piece but waste more on cuts.
Quick answer
How Much Grout Do I Need for My Tile Project?
A typical 100 ft² floor with 12×12 tiles and ⅛ inch joints needs about 7 pounds (one 10-lb bag) of unsanded grout. Smaller tiles and wider joints need more — see the full chart below.
Quick answer
How Much Thinset Mortar Do I Need?
A 50-lb bag of thinset mortar covers 75-95 ft² with a ¼" notched trowel — the standard for 12×12 floor tile. For larger tiles or backer board you need a deeper trowel that uses more thinset per ft².
FAQ
Frequently asked
10% for straight-lay floors and walls, 15% for diagonal or herringbone, 20% for very small or unusually shaped spaces. Mosaics and natural stone need 15% minimum because of breakage.
4×8 is the standard — lighter, easier to handle alone. 4×12 reduces seams on long walls but takes two people to carry. Use ½" on walls and ⅝" on ceilings (sags less).