Tile Quantity Calculator for walls and floors with box counts

The Tile Quantity Calculator estimates how many tiles and boxes you need using your unit system. First, pick imperial or metric so labels match your tape. Enter the size of the surface to be covered, subtract any openings, and set how many identical areas you have if you’re doing multiple walls or floors. Then provide the tile’s face size and your grout joint. The calculator figures coverage using the tile size plus the joint so results reflect the layout you’ll install, not just the raw tile dimensions.

Waste accounts for breakage and cuts. If you leave the waste box empty, the tool adds a sensible default based on pattern: straight lay uses less waste than diagonal or herringbone. You can override the margin at any time.

• Straight lay: low waste (typically 7%).
• Running bond: moderate waste (≈10%).
• Diagonal: higher waste (≈12%).
• Herringbone: highest waste (≈15%).

When you press Calculate Tiles, you’ll see total area, net coverage after joints, recommended waste, total tile count rounded up, and a quick suggestion for boxes using your tiles-per-box number. Round up boxes to the next whole box so you have spares for future repairs and selection for shade matching.

Coverage is computed from the tile’s face size plus the grout joint on both length and width, which approximates center-to-center spacing in most layouts. Real-world patterns, trims and perimeter cuts can change coverage slightly. For subway tiles with offset joints, the per-tile coverage estimate remains valid because spacing repeats. Always check a box label for exact piece size and recommended joint, since nominal sizes (e.g., “12×24”) can vary by manufacturer and caliber.

Exclusions subtract directly from total area, which is convenient for large windows or doorways. For complex rooms, break the space into rectangles, compute each one, and use the “Quantity of identical areas” to multiply repeating sections. If you are tiling inside niches or around obstacles, increase waste by a few percent beyond the pattern default to stay safe.

Box counts depend on how many tiles a box contains; manufacturers often pack by weight. If you’re between two box counts, choose the higher. Extra pieces help with future repairs and grade matching if you open a new pallet mid job. Store spares in a labeled box noting brand, series, color, size, and caliber/date.