Tile Count Calculator

What it does

Calculate how many tiles you need to floor or wall a space — including a realistic waste buffer for cuts, breakage, and future repairs. Enter the area in square feet (or square meters) plus the tile dimensions and the tool returns: tiles needed, boxes to buy (rounded up to whole boxes), total square footage of tiles ordered, and approximate cost if you enter price-per-box.

Why the waste buffer matters: tile installations always need cuts at edges, around fixtures, and at corners. Some cuts produce unusable scraps. Plus you should keep extras for future repairs (a chipped tile years later needs a same-batch replacement — dye lots vary). The standard waste percentages:

• 10% — straight rectangular rooms with simple cuts (most kitchens, bathrooms, mudrooms).
• 15% — rooms with angles, niches, or complex cuts (L-shaped rooms, walls with windows/doors, around toilets and tubs).
• 20% — diagonal patterns (45° rotation), herringbone, or mosaic patterns where every tile gets cut.
• 25-30% — large-format tiles (24×24 or larger), where individual cut waste is bigger; or for first-time DIYers who’ll likely break a few learning.

The math: tiles needed = ceil(area / tile area × (1 + waste%)). Boxes = ceil(tiles / per-box). Always order full boxes from the same dye lot — color matching across batches is unreliable, and many retailers won’t accept partial-box returns.

How to use it

1. Measure the floor or wall area in square feet (length × width). For irregular rooms, break into rectangles and add. For walls with windows/doors, subtract those areas.
2. Enter total area in square feet (or switch to metric).
3. Set tile dimensions (e.g. 12×12, 18×18, 24×24, mosaic 1×1, subway 3×6). The tool calculates tile area in square feet.
4. Pick waste percentage based on your install complexity. Default 10% is fine for simple rectangles.
5. Enter tiles-per-box (read off the box; varies by tile size — typical 12×12 is 8-12 per box, 18×18 is 4-6, 24×24 is 2-3).
6. Optionally enter price per box for total-cost estimate.
7. Read the result: tiles needed, boxes to buy, total order. Always round UP to whole boxes; don't try to buy partial.

When to use this tool

• Planning a kitchen, bathroom, or floor tiling project.
• Estimating tile cost before committing to a renovation budget.
• Comparing tile sizes — large-format tiles waste more but cover faster.
• Sanity-checking a contractor’s quoted tile order against your own math.

When not to use it

• Highly custom installations with mixed tile sizes (mosaic accents, decorative borders) — calculate each tile type separately.
• Stone or natural-material tiles where dye-lot variation is extreme — work with a stone supplier who can over-order from the same slab.
• When you’re unsure of the actual install complexity — get a contractor’s estimate; they account for things tile calculators can’t see.

Common use cases

• Pre-decision sanity-check on inputs and outputs
• Educational use — demonstrating the underlying concept
• Onboarding a colleague who needs the same calculation/conversion
• Verifying a number or output before passing it on