Free calculator for how much tile adhesive (mortar) and grout you need per m²: kg and bags based on tile size, trowel and joint width. For floor and wall, porcelain and ceramic.
Reference consumption for cement-based adhesive. Back-buttering (large tile/exterior) multiplies it by about 1.6:
| Tile size | Trowel | Adhesive |
|---|---|---|
| ≤ 10 × 10 cm | 4 mm | ~2 kg/m² |
| ≤ 20 × 20 cm | 6 mm | ~3 kg/m² |
| ≤ 30 × 30 cm | 8 mm | ~4 kg/m² |
| ≤ 60 × 60 cm | 10 mm | ~5 kg/m² |
| > 60 cm / floor | 12 mm | ~6–7 kg/m² |
kg/m² = ((A + B) / (A × B)) × joint width × thickness × 1.6 — with A, B, joint and thickness in mm. Small tiles and wide joints use more grout.
Still need the tiles? Use our tile & porcelain calculator (how many per m²).
It depends on the tile size and the trowel: ~2 kg/m² for small tiles (4 mm trowel), 4 kg/m² for 30×30 cm (8 mm) and 5-7 kg/m² for floor/large format (10-12 mm). Back-buttering multiplies it by about 1.6.
Grout = ((A+B)/(A×B)) × joint width × thickness × 1.6, with measurements in mm. Small tiles and wide joints use more.
4 mm for mosaics, 6 mm up to 20 cm, 8 mm up to 30 cm, 10 mm up to 60 cm and 12 mm (with back-buttering) for large format and exterior.