Calculadora de Cobertura de Piso e Revestimento

Como o cálculo funciona

The tile count is an area division done in millimetres. Your tile size is padded by one grout gap on each axis, giving an effective footprint of (tile length + gap) × (tile width + gap); the floor area is divided by that footprint and rounded up to get the bare tile count. The pattern waste percentage is then applied on top and rounded up again. Grout area is reported separately as floor area minus the bare tiles multiplied by their unpadded size.

Pattern choice is the main waste driver: Straight adds 10 percent, Brick / offset 12 percent, Diagonal 15 percent and Herringbone 20 percent, because rotated and staggered layouts throw away more of each cut tile. Tiles per box, default 10, converts the tile count into boxes to buy. Note that the grout gap is entered in millimetres in both unit systems, even when tile dimensions are in inches — 3 mm is the default and a common wall and floor spacing.

This is area maths, not a layout. It never works out which rows fall where, so it cannot tell you that a room whose width leaves a two-inch sliver at one wall will burn far more tile than the flat percentage suggests. Columns, islands, hearths and door reveals are not deducted. The grout figure is an area, not a volume, because joint depth is not an input, so treat it as a rough guide when buying grout by the bag.

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