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A comprehensive guide to calculating the exact number of tiles for your bathroom floor. Learn how to measure your space, choose the right tile size, account for waste, adjust for fixtures, and estimate costs for a successful renovation.
For a standard 80 sq ft bathroom floor (8×10 feet), you need approximately 88 square feet of tile with a 10% waste factor — or about 88 individual 12×12 inch tiles.
Start by measuring the length and width of your bathroom in feet. Multiply them together to get the total square footage. If your bathroom has an irregular shape, break it into rectangles, calculate each area, and add them up.
Bathroom sizes vary widely. Here are three common categories to help you estimate:
| Bathroom Size | Typical Dimensions | Floor Area |
|---|---|---|
| Small (Half Bath) | 5 × 8 ft | 40 sq ft |
| Medium (Standard) | 8 × 10 ft | 80 sq ft |
| Large (Primary) | 10 × 12 ft | 120 sq ft |
Always measure in multiple spots — walls aren't always perfectly parallel. Use the largest measurement for each dimension to ensure you purchase enough tile.
The number of tiles you need depends on the tile size you choose. Divide your total square footage by the area of a single tile. Below is a reference table for a standard 80 sq ft bathroom (with 10% waste = 88 sq ft):
| Tile Size | Sq Ft per Tile | Tiles per Sq Ft | Tiles for 80 Sq Ft |
|---|---|---|---|
| 6×6 inches | 0.25 sq ft | 4 | ~352 tiles |
| 12×12 inches | 1.0 sq ft | 1 | ~88 tiles |
| 12×24 inches | 2.0 sq ft | 0.5 | ~44 tiles |
| 18×18 inches | 2.25 sq ft | 0.44 | ~39 tiles |
| 24×24 inches | 4.0 sq ft | 0.25 | ~22 tiles |
Larger tiles mean fewer pieces to install but may require more precise cuts around edges and fixtures. Smaller tiles offer more design flexibility and work well with complex floor shapes.
You should always order more tile than the exact area requires. Cuts, breakage during installation, and pattern alignment all consume extra material. The amount of waste depends on the layout pattern:
Simple rows and columns with minimal edge cuts
Staggered rows requiring moderate cuts at edges
Complex angled cuts at every edge
For first-time DIY installers, consider adding an extra 5% on top of these recommendations. It's far cheaper to buy a few extra tiles upfront than to order a second batch that may come from a different dye lot.
Bathroom floors usually have fixtures that occupy space. You can choose to subtract these areas from your total or tile underneath them. Here are common fixture footprints:
Most professionals recommend tiling the entire floor, including under fixtures. This provides a cleaner finish, makes future renovations easier, and prevents moisture issues. If you do subtract fixture areas, still add your waste factor to the remaining area.
Tile costs vary based on material, quality, and style. Here are typical price ranges for an 80 sq ft bathroom floor (88 sq ft including 10% waste):
$1–$3 per sq ft
$3–$8 per sq ft
$8–$20+ per sq ft
These estimates cover tile material only. Budget an additional $5–$10 per sq ft for professional installation, plus costs for underlayment, thinset mortar, grout, and sealant.
Skip the guesswork. Use our professional tile calculator to get precise quantities, cutting plans, and layout visualizations tailored to your bathroom dimensions.
Written by the TilePro Calculator Team
Professional tile layout tools and guides since 2026