Wall tile calculator

The browser tool runs free on your device; the prepaid API charges $0.002 per successful item when servers and SDKs need the same contract.

Measure wall area and match tile dimensions to one unit system

Begin by measuring every surface you intend to tile. For a single rectangle multiply width by height; for L-shaped walls, niches or multiple elevations add the rectangles and subtract large openings such as windows and doors if you will not tile those zones. If you measured in centimetres, convert either the area or the tile edges so they agree; mixing metres for the wall and centimetres for the tile undercounts tiles by a factor of ten thousand. Express the total as wall_area in square metres, square feet or any other square unit you prefer—the calculator does not convert units, so the linear size of each tile must use the square root of the same system. If wall_area is twelve square metres, send tile_width and tile_height in metres (for example zero point three by zero point six). Optional aliases area, wall and surface_area are accepted for wall_area, and width or tile_w together with height, tile_h or tile_length cover common form labels. All three geometric inputs must be strictly positive finite numbers: zero, negative or non-numeric values raise invalid_input and are not charged. Extremely small or huge values outside the published stability range are also rejected so floating-point results stay meaningful on a Worker isolate.

Waste allowance, tiles per box, and how the ceil math works

Real installs waste material. Diagonal layouts, large-format rectified tiles, patterned collections that must match, and first-time DIY cuts all consume extras. The optional waste_percent field defaults to ten when omitted and accepts values from zero through one hundred; aliases waste, waste_allowance and overage map to the same number. The engine builds a waste_factor equal to one plus waste_percent divided by one hundred, multiplies wall_area by that factor to get area_with_waste, then divides by tile_area equal to tile_width times tile_height. That quotient is tiles_exact; tiles_needed is the ceiling of that quotient so partial tiles always become a full piece on the order sheet. You also send tiles_per_box as a positive integer—how many whole tiles the manufacturer packs in one carton—with aliases per_box, box_size and tiles_in_box. boxes_needed is the ceiling of tiles_needed divided by tiles_per_box, and leftover_tiles_in_last_box reports unused slots in the final carton so you can plan storage or return policies. The method label is always area_with_waste_ceil for stable downstream branching. Negative waste, non-integer or non-positive box sizes, and missing required fields fail with invalid_input. Identical inputs always produce identical JSON because the path is pure arithmetic with no network, random seed or wall clock.

API usage, pricing, renovation workflows, and practical limits

Call the free in-browser wall tile calculator for quick home estimates, showroom kiosks and contractor whiteboards without installing a spreadsheet. Send a JSON body with wall_area, tile_width, tile_height and tiles_per_box, plus optional waste_percent when ten percent is not appropriate for your layout. Use the prepaid API when a renovation app, ecommerce configurator, quantity-takeoff pipeline or property-management tool needs a stable contract under KIT balance at $0.002 per successful item; validation failures never consume balance after the engine rejects the request. Pair this endpoint with unit converters when customers mix imperial and metric packaging, or with room-area helpers when wall dimensions arrive as separate width and height fields that you multiply client-side before calling. Remember that pattern layouts such as herringbone or chevron often need higher waste than a straight stack bond, and very large porcelain slabs may ship only a few pieces per crate—always read the carton label into tiles_per_box rather than guessing. Authors shipping SDKs can map tiles_needed and boxes_needed straight into cart lines while showing area_with_waste and leftover_tiles_in_last_box as explanatory detail for the buyer.