Tile Calculator
Estimate tile quantity, waste allowance, boxes to buy and approximate product cost for a rectangular floor or wall area.
Project & product
Estimate
For patterned, diagonal or irregular layouts, increase the waste allowance.
How tile quantity is estimated
The calculator finds the project area in square feet, converts one tile's dimensions from square inches to square feet, then divides the project area by the tile area.
Waste is applied after the base tile quantity is calculated. The final tile count is then converted to full boxes because flooring products are normally purchased by the box.
Worked example
What waste percentage should I use?
Simple straight layouts usually need less extra material than diagonal patterns, complicated cuts or irregular rooms. Use a percentage that reflects your actual layout rather than treating the default as a rule.
Tile planning guide
Tile quantity should be based on the actual surface area plus an allowance for cuts, breakage and future replacements. Tile size, grout-joint layout, diagonal patterns, niches and room geometry affect waste, so verify pieces per carton and carton coverage for the exact tile and round purchasing quantities up to full boxes.
Turning the estimate into an order
Calculate the base requirement first, then convert it into whole boxes based on the selected tile’s box coverage. Before ordering, verify net tiled area, tile size, layout pattern and box coverage. Round only at the final purchasing step so intermediate rounding does not quietly inflate the estimate.
What changes the field quantity
Tile layout can create significant cut waste around niches, corners and diagonals. Large-format tile may also have stricter layout and substrate requirements than small tile.
Handling a non-rectangular project
Measure each wall or floor plane separately and note niches, benches and accent bands. Apply a higher waste allowance to diagonal or highly cut layouts instead of averaging them with simple rectangular fields.
Mistakes worth checking
- Using nominal tile size without accounting for the layout module
- Ignoring niches, returns or accent bands
- Applying low waste to diagonal patterns
- Dividing by individual tile area when the product is sold by full box with stated coverage
Tile calculator FAQ
Does grout joint width reduce the number of tiles I need?
This calculator does not treat grout width as extra tile coverage. Purchase quantity is based on tile face dimensions plus the selected waste allowance.
Why does the calculator round boxes up?
You usually cannot buy a fraction of a sealed box, so the estimate rounds the final package count upward.
Should I keep leftover tile?
Keeping a small amount from the same production run can be useful for future repairs, but the appropriate amount depends on the project and product.
Tile ordering notes
Lay out the tile pattern before ordering, especially for centered joints, diagonals or large formats. Use the box coverage on the product label, round to full boxes, and keep trim pieces or mosaics as separate takeoff items.
Use the calculator result as a planning quantity, then compare it with the packaging, minimum order, delivery rules and technical data for the exact tile you intend to use. Where drawings, codes or manufacturer instructions conflict with a general estimate, follow the project-specific requirement.
Before placing the order
- Recheck the final measured dimensions after the project scope is fixed.
- Confirm net tiled area, tile size, layout pattern and box coverage.
- Convert the calculated requirement into the supplier’s actual selling units and round up only where whole units are required.
- Keep labor, delivery, tax, equipment and site-specific requirements separate unless the calculator explicitly includes them.
How to use this tile estimate in a real project
Estimate tile area, add cut/breakage allowance based on layout, then convert to boxes using the exact carton coverage.
Worked planning check: 120 ft² bathroom with 12% waste
120 × 1.12 = 134.4 ft². If a carton covers 15.6 ft², 134.4 ÷ 15.6 = 8.62, so plan on 9 cartons.
What to verify before you buy
- Measure the project after the layout is fixed, not from an early sketch.
- Replace every default value with the specification, package coverage or local quote for the exact material you will use.
- Round to whole bags, boards, sheets, bundles or cartons only at the final purchasing step.
- Keep delivery, tax, labor, equipment, permits and structural/code requirements separate unless a calculator field explicitly includes them.
Reference sources and cross-checks
- Calculator.net Concrete Calculator — Benchmark example of pairing a calculator with shape-specific explanations and educational context.
- Omni Calculator — Construction — Benchmark example of organizing many construction tools into clearly explained topic clusters.
BuildCalc Guide is an independent planning tool. External references are used to check terminology, typical estimating methods and manufacturer-specific cautions; they do not sponsor or endorse this site. Product labels, project documents and locally adopted codes take priority.