How much tile do I need for a 100 sq ft floor?

For a 100 sq ft floor using 12×12 inch tiles (1 sq ft each), you need approximately 110 tiles with a 10% waste buffer. Always order at least 10% extra to account for cuts, breakage, and future repairs.

Why should I buy 10% extra tile?

Tiles along walls must be cut to fit, and cuts produce offcuts that cannot be reused. Additionally, tiles can crack during installation. If a tile breaks later, having matching tiles from the same batch ensures a consistent look. Always buy 10–15% extra when tiling.

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🛠️ Construction & DIY

Tile & Grout Calculator

Calculate the number of tiles needed for any floor or wall area, including a 10% waste buffer option.

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tile grout floor wall waste square footage

Area Length (ft)

Area Width (ft)

Tile Size (inches)

Include 10% Waste Buffer

Tile Coverage & The 10% Waste Rule

Tile projects invariably produce waste from cuts, broken tiles, and pattern offsets. Professionals universally recommend purchasing at least 10% extra tiles. For diagonal patterns or complex layouts, 15% extra is advisable. Grout width also affects the number of tiles per square foot.

The Tile Count Formula

Total Area (ft²) = Length × Width

Adjusted Area = Total Area × 1.10 (with 10% buffer)

Tile Count = Adjusted Area ÷ Tile Face Area (ft²)

Grout Joints

Standard floor tile grout joints are 3/16" to 1/4". With rectified tiles (precisely machined), joints can be as narrow as 1/16". Wider joints reduce the number of tiles slightly but require more grout. For a 12"×12" tile with a 3/16" joint, the effective tile footprint becomes approximately 12.1875"², which is factored into this calculator.

Tile & Grout Calculator

Tiles Required

Tile Coverage & The 10% Waste Rule

The Tile Count Formula

Grout Joints