Tile Quantity Calculator

How to estimate tile quantity

Start with the room area in m². Add 5–10% for losses to cover cuts, breakage and the odd tile you'll want to keep for future repairs, then divide by the m² in each box. Boxes usually hold somewhere between 1 and 2.5 m². The formula comes out to boxes = ceil((area × 1.10) / m²_per_box). For adhesive mortar, budget 4–5 kg/m² (AC-I works indoors, while AC-II/III is what you want for exterior walls, wet areas and pools), plus grout at about 0.5 kg/m². Pick the tile by its PEI rating, which is the abrasion class: PEI 3 handles residential bathrooms, PEI 4 suits kitchens and entryways, and PEI 5 is meant for commercial high-traffic spots. The relevant Brazilian standards here are NBR 13753 for installation and NBR 13818 for ceramic specifications.

Say you have a 20 m² kitchen and boxes of 2 m²: (20 × 1.10) / 2 = 11 boxes. Mortar works out to 20 × 4.5 = 90 kg, and grout to 10 kg.

Applications

Handy for budgeting a renovation, checking retail quotes at places like Leroy Merlin, Telhanorte or C&C, double-checking a contractor's estimate, and ordering materials when you're building it yourself.

FAQ

Why 10% extra and not less? A diagonal layout can push you to 15%, while a straight layout in a rectangular room often gets by on 5–7%. Either way, hang on to a spare box for repairs down the line. Patterns get discontinued, and chasing a match later is a familiar headache.

Which PEI for my bathroom? For a residential wet area, PEI 3 is plenty. Step it up to PEI 4–5 once you're dealing with outdoor patios, garages or commercial floors.

AC-I, AC-II or AC-III mortar? Use AC-I on dry indoor walls and floors. AC-II is for anywhere water shows up, like a kitchen or bath. Save AC-III for façades, pools and saunas, where thermal and structural stress comes into play.