Utility

Tile Coverage Calculator

Calculate how many tiles and how much clay you need to cover a wall or floor area.

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Enter your measurements above and click Calculate.

Calculating Tile Coverage

When planning a ceramic tile installation, you need to know both how many tiles to produce and how much clay to prepare. This calculator works from the fired tile dimensions to determine coverage area, accounts for grout gaps and breakage waste, and calculates wet-state cutting dimensions based on clay shrinkage.

Shrinkage and Wet Dimensions

Clay shrinks during drying and firing. If your finished tile needs to be 15 × 15 cm and your clay shrinks 12%, you must cut the wet tile larger:

wet_size = fired_size ÷ (1 − shrinkage% ÷ 100)

// 15 cm ÷ (1 − 0.12) = 17.05 cm wet

Waste Allowance Guidelines

10%

Minimum for simple rectangular installations. Experienced tile makers with consistent results.

15%

Recommended standard. Covers breakage, cracking, and firing losses in a typical batch.

20–25%

Complex patterns, diagonal layouts, intricate cuts, or first-time tile production.

Frequently Asked Questions

Why do I need to add a waste percentage? expand_more
Ceramic tiles break during cutting, firing, and handling. Border tiles require cutting. Kiln losses add further. A 10–15% waste allowance ensures you do not run short mid-project with no way to match the batch.
How do I ensure tile batches match in color? expand_more
Fire all tiles for the same project in the same kiln load at the same cone with the same glaze batch. Clay body color and glaze response can vary between batches. Mix tiles from different firing positions when laying to distribute any variation.