Tile Calculator

Divide the area by one tile’s area and add a waste allowance. A 13 × 10 ft floor (130 sq ft / 12 m²) in 24 × 12 in (600 × 300 mm) tiles (1.94 sq ft each) needs 67 tiles; with 10% waste, order 74. The calculator also converts that into boxes using the tiles-per-box figure on the packaging.

10% covers straightforward layouts with normal cutting and breakage. Go to 15% for diagonal patterns, herringbone, rooms with many recesses, or large-format tiles where one bad cut costs a whole tile. Below 5% is gambling — a single box short can mean a discontinued batch.

A 50 lb (20 kg) bag typically covers 40–55 sq ft (4–5 m²) with a ¼ in (6 mm) notch trowel for floors — less with the bigger notches large-format tiles need, more for thin wall tiles. The calculator estimates bags from your coverage figure; uneven substrates and back-buttering push usage up.

It depends on the tile size and joint width — big tiles have far less joint per square foot. The calculator estimates it from the tile dimensions, joint width and tile thickness: a 24 × 12 in (600 × 300 mm) floor at ⅛ in (3 mm) joints uses only about 0.04 lb/sq ft (0.2 kg/m²), while small mosaics can use ten times that.

Yes — from one batch. Tile shade and calibration vary between production batches, and a later top-up rarely matches. Check the batch numbers on the boxes at collection, and keep a few spare tiles after the job for future repairs.