Tile Grout Calculator
Calculate the exact amount of grout needed for your tile project. Get accurate estimates based on tile size, joint width, and area coverage.
Calculate Grout Needed
Typical: 2-5mm (wall), 3-10mm (floor)
Usually equals tile thickness (4-10mm)
How Grout Calculation Works
The grout calculator determines the amount of grout needed based on the total joint volume, which depends on tile dimensions, joint width, depth, and coverage area.
Calculation Formula
1. Tiles Required = Area ÷ Tile Area
2. Joint Area per Tile = (Tile Length + Tile Width + Joint Width) × Joint Width
3. Total Joint Volume = Joint Area × Joint Depth × Number of Tiles
4. Grout Weight = Volume × Density (1600 kg/m³)
5. Final Weight = Grout Weight × 1.10 (10% wastage)
Joint Width Guidelines
- Wall Tiles (2-3mm): Smaller joints for smoother appearance
- Floor Tiles (3-5mm): Standard joints for residential floors
- Large Format (5-10mm): Wider joints for tiles over 60cm
- Rectified Tiles (1.5-2mm): Minimum joints for precision-cut tiles
Pro Tips for Grouting
Wait Before Grouting
Allow tile adhesive to cure for 24-48 hours before applying grout. Premature grouting can cause tiles to shift.
Mix Small Batches
Mix grout in small batches that can be applied within 30 minutes. Grout begins to set and becomes difficult to work with.
Clean As You Go
Remove excess grout from tile surfaces within 15-20 minutes using a damp sponge. Dried grout is very difficult to remove.
Seal Natural Stone
Pre-seal porous tiles like marble or limestone before grouting to prevent grout staining. Reseal after grouting completes.
Use Proper Tools
A rubber grout float applies grout effectively at a 45° angle. Use a grout sponge (not regular sponge) for cleanup.
Cure Time Matters
Wait 72 hours before allowing foot traffic on floor tiles. Full cure takes 28 days for maximum strength and water resistance.
Frequently Asked Questions
How much grout do I need for 10m² of tiles?
For standard 30×30cm tiles with 3mm joints and 6mm depth, you'll need approximately 2-3 kg of grout per 10m². Actual amount varies based on tile size and joint width - use our calculator for precise estimates.
What is the standard grout joint width?
Standard joint widths are 2-3mm for wall tiles, 3-5mm for floor tiles, and 5-10mm for large format tiles (over 60cm). Rectified tiles can use narrower joints (1.5-2mm), while rustic tiles may need wider joints (up to 10mm).
How deep should grout be in tile joints?
Grout depth should equal the tile thickness for proper support and appearance. For most tiles, this is 6-10mm. Floor tiles typically need full-depth grouting, while wall tiles can have slightly shallower joints.
Can I use the same grout for walls and floors?
While standard grout works for both, floor grout should be more flexible and durable. Use sanded grout for joints wider than 3mm (common on floors), and unsanded for narrower joints (typical on walls). Epoxy grout is best for high-traffic or wet areas.
Why do I need to add wastage to grout calculations?
We add 10% wastage to account for grout absorbed by porous tiles, material stuck in mixing buckets, uneven joint depth, and grout removed during cleanup. It's better to have excess than run short mid-project.
What's the difference between sanded and unsanded grout?
Sanded grout contains fine sand and is used for joints 3mm or wider. It's stronger and less prone to cracking. Unsanded grout is smooth and used for joints narrower than 3mm, and for polished tiles where sand could scratch the surface.
How long does grout take to dry?
Grout typically dries to touch in 24 hours, but requires 72 hours before exposing to moisture or foot traffic. Full curing takes 28 days. During this time, avoid water exposure (except for initial cleanup) and allow proper air circulation.
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