Tile Grout Calculator
Precision grout estimation for porcelain, ceramic, and natural stone tiles.
Grout Estimate
Coverage Tip:
For mosaic tiles or irregular stone, add an extra 20% to your estimate as grout consumption is significantly higher due to more frequent joints.
Tiling Masterclass: Calculating Grout & Jointing
Why Precision Matters
Running out of grout halfway through a room is a disaster. If you mix a new batch from a different bag, you might end up with a slightly different shade, creating a patchy and unprofessional finish.
Using a grout calculator ensures you buy enough material to complete the job in one go, maintaining colour consistency across your entire floor or wall.
UK Grout Standards
- Standard Bag Size: 5kg / 10kg
- Wall Joint: 2mm Standard
- Floor Joint: 3mm - 5mm
- Anti-Mould: Essential for bathrooms
The Role of Grout
Grout is more than just a decorative filler. Its primary roles are to:
- Allow for thermal expansion (preventing tiles from "popping").
- Seal the gaps against water ingress.
- Bind the tiles together to create a unified surface.
Textured & Porous Tiles
Natural stone (like Travertine or Slate) is porous. If you apply grout without sealing the stone first, the grout can stain the surface permanently. Always seal your stone before jointing!
Grout Haze
After grouting, a 'haze' will form on the tile. Use a damp sponge to clean it off within 20-30 minutes. If you leave it too long, you will need a special 'acid wash' to remove it.
Pro Tip: Mixing Consistently
Measure your water accurately! Adding different amounts of water to different batches of grout can actually change the final dried colour. For the best result, mix the entire bag at once if possible.
Tile Grout FAQ
Application Disclaimer
Grout coverage can vary based on the depth of the joint and the amount of waste during the wiping-off process. We always recommend adding 15-20% for waste on smaller tile projects and mosaics.