Tile Grout Quantity Calculator (kg)

Estimating grout consumption per area

For a standard 30×30 cm tile with a 3 mm joint at 8 mm depth, count on roughly 0.5 kg/m² as your starting figure. Go to smaller tiles, or open the joints wider, and that number climbs fast — each square meter ends up holding a lot more joint length. Say you've got 20 m² of bathroom wall in 30×30 cm tile with a 3 mm joint. That works out to about 10 kg of grout, or two 5 kg bags off the shelf. The math behind it: consumption = (tile_side + joint) / tile_side² × joint_width × joint_depth × density, where density sits around 1.6 g/cm³ for cement-based grout.

Applications and grout types

It helps you size up bathroom, kitchen, pool and façade jobs. A few grout types show up over and over. Acrylic suits residential work and goes on without much fuss. Epoxy doesn't let water through, which is why pools and industrial wet areas default to it. Flexible grout puts up with floors that shift a little; antibacterial grout shows up in hospitals and food service. Colors tend to be white, black, gray or beige. For a pool or sauna, epoxy isn't optional. On a façade, go with a flexible grout that holds up under UV.

FAQ

How much extra should I buy? Tack on 10–15%. It covers waste, the batch that goes wrong, and the touch-ups you always end up doing later.

Does tile size really matter? Yes. A 10×10 cm tile burns through about 3× more grout per m² than a 60×60 cm tile, since the joints add up to a far greater total length.

Epoxy vs cement grout? Epoxy won't let water through and shrugs off stains, so it's the right call for pools and wet areas, though it runs 3–5× the price and takes more skill to lay. For most walls and floors at home, cement grout does the job fine.