Interior Calculators

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.

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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.

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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.

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Drywall Mud & Tape Calculator: Joint Compound by Sheet & Sq Ft

Plan on 5.3 gallons (one 4.5-gal bucket) of all-purpose joint compound per 100 ft² of drywall, plus 250 linear feet of paper tape. A typical 12×14 ft room (584 ft²) needs 31 gallons (~7 buckets) of mud and 1,460 ft of tape.

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Deck Mud Calculator: Shower Pan & Tile Underlayment Mortar

A standard 3×5 ft shower pan with a 1-inch pre-slope plus a 1¼-inch final mud bed needs about 2.5 cubic feet of dry-pack mortar — 4 bags of 80 lb sand-topping mix. For each 1 ft² of pan area, plan on 0.17 ft³ per inch of mud thickness.

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Floor Mud Calculator: Self-Leveling Compound by Sq Ft

A 50 lb bag of self-leveling underlayment covers about 25 ft² at ¼ inch deep, or 50 ft² at ⅛ inch deep. A 200 ft² floor needing ⅛ inch on average takes 7-8 bags.