Grout Calculator
Calculate exactly how many pounds and bags of grout you need for any tile project. Supports sanded, unsanded, and epoxy grout with real-time coverage, waste, and cost estimates.
Grout Like a Pro: Essential Guides & Reviews
Choosing the right grout type is just the beginning. Protect your tile investment with proper cleaning, sealing, and product selection:
Not sure which grout type to use? Read our side-by-side breakdown of cost, durability, stain resistance, waterproofing, and application difficulty for cementitious vs. epoxy grout.
Already have dingy, stained grout? See our honest review of Stanley Steemer’s professional tile and grout cleaning service, pricing, results, and when it makes sense to clean vs. regrout.
Renovating your bathroom or kitchen tile? If your project involves opening up walls or ceilings, it may be the perfect time to inspect and replace aging ductwork. Use our calculator to estimate duct replacement costs alongside your tile project.
How Much Grout Do I Need? The Complete Grout Calculation Guide
The amount of grout required for a tile project depends on four primary variables: tile size, grout joint width, grout joint depth (tile thickness), and total tile area. Smaller tiles with wider joints consume dramatically more grout per square foot than large-format tiles with tight joints.
| Tile Size | 1/16″ Joint | 1/8″ Joint | 3/16″ Joint | 1/4″ Joint |
|---|---|---|---|---|
| 1×1″ Mosaic | ~1.0 lb/sf | ~2.0 lb/sf | ~3.0 lb/sf | ~4.0 lb/sf |
| 3×6″ Subway | ~0.18 lb/sf | ~0.36 lb/sf | ~0.55 lb/sf | ~0.73 lb/sf |
| 6×6″ | ~0.12 lb/sf | ~0.24 lb/sf | ~0.36 lb/sf | ~0.48 lb/sf |
| 12×12″ | ~0.06 lb/sf | ~0.13 lb/sf | ~0.19 lb/sf | ~0.25 lb/sf |
| 12×24″ | ~0.04 lb/sf | ~0.09 lb/sf | ~0.13 lb/sf | ~0.17 lb/sf |
| 24×24″ | ~0.03 lb/sf | ~0.06 lb/sf | ~0.09 lb/sf | ~0.13 lb/sf |
Coverage rates assume 1/4″ tile thickness (standard porcelain) and sanded cementitious grout at ~100 lbs/cu ft density. Epoxy grout density is slightly higher (~110 lbs/cu ft). Rates do not include waste factor.
Sanded vs. Unsanded vs. Epoxy Grout: Which Should You Use?
Choosing the correct grout type is essential for a durable, crack-free installation:
- Sanded Grout: Best for joints wider than 1/8″. The sand aggregate provides structural strength that prevents shrinkage cracking in wider joints. Costs $0.45 – $0.80 per pound. Must be sealed annually to prevent staining. Available in 40+ colors from brands like Mapei Keracolor, Custom Polyblend, and Prism.
- Unsanded Grout: Best for joints 1/8″ or narrower. The smooth texture prevents scratching polished marble, glass tile, and glossy ceramic surfaces. Costs $0.65 – $1.20 per pound. Also requires sealing. Ideal for backsplashes, shower wall accents, and decorative glass mosaic installations.
- Epoxy Grout: Premium option for any joint width. 100% waterproof, stain-proof, and never requires sealing. Costs $3.00 – $6.00 per pound but lasts a lifetime. Perfect for shower floors, commercial kitchens, pool decks, and high-traffic retail spaces. More difficult to apply (short working time). Read our detailed cementitious grout vs. epoxy grout comparison.
Pro Tips for Accurate Grout Estimation
- Always round up to the next full bag. You cannot buy partial bags, and having a spare partial bag on hand is invaluable for future repairs and touch-ups.
- Grout depth = tile thickness, not the thinset bed depth. The grout fills the joint from the tile surface down to the substrate or spacer level.
- Natural stone tiles often have beveled edges (tumbled, chiseled) that create wider effective joint widths at the surface, increasing grout consumption by 15% – 25% beyond what the spacer width suggests.
- Mosaic sheets (mesh-backed 1×1 or 2×2 tiles) are the most grout-intensive tile format. A single 25 lb bag may cover only 15 – 35 sq ft depending on joint width.
- Herringbone and chevron patterns have more cut edges and irregular joint intersections, so add at least 5% extra waste beyond the standard 10%.