Tile Calculator
Calculate exact tile count, retail boxes, and grout bags for bathroom floors, kitchen backsplashes, and showers.
- 8 × boxes of tile (15 sq ft/box · 110 tiles total)
- 1 × 25 lb bag of tile grout (~100 sq ft coverage)
Standard Project Worked Example (No JavaScript Required)
Baseline Scenario: 100 sq ft floor, 12×12 in tiles, 15 sq ft/box: 0% waste = 100 tiles, 7 boxes (6.67 ceil). 10% straight lay = 110 tiles, 8 boxes (7.33 ceil). 15% diagonal lay = 115 tiles, 8 boxes (7.67 ceil).
Our online calculator updates dynamically in real-time as you type your project measurements. If JavaScript is disabled, use the formula reference below.
How This is Calculated
Base Tiles = Area / Tile Area. Total Tiles = Base Tiles × (1 + Waste% / 100). Total Boxes = Total Area With Waste / Box Coverage, rounded UP to whole boxes.
Sourced Reference Constants
- All material yields and bag volumes are derived from official manufacturer technical data sheets.
- Buy quantities are strictly rounded UP to full purchasable units (bags, boxes, sheets, gallons, pavers).
- Waste allowances are user-adjustable to fit complex room alcoves, diagonal patterns, or soil conditions.
Frequently Asked Questions
How much tile waste should I calculate?
Add 10% extra tile for standard square grid layouts, and 15% extra for diagonal layouts, herringbone patterns, or rooms with many alcoves.
How many square feet are in a box of tile?
Standard 12×12 inch floor tile packages typically contain 10 to 15 square feet per box depending on manufacturer and tile thickness.
How much grout do I need for floor tile?
A standard 25 lb bag of dry grout covers approximately 100 to 150 square feet of 12×12 inch tile with 1/4-inch grout joints.