Grout Calculator: Free 3D Tile Grout Coverage, Bag & Cost Estimator
Tiling a shower, kitchen backsplash, or floor? Use our interactive 3D grout calculator and tile grout calculator to visualize your tile thickness, joint width, and grout channel volume in real time. This precision grout estimator and grout coverage calculator converts your square footage into exact pounds, 25-lb or 10-lb bags, 1-quart premixed tubs, and total material costs.
| Coverage & Cost Item | Calculated Quantity | Estimated Cost |
|---|---|---|
| Coverage Per 25-lb Bag (Your Tile) | 378.5 sq ft per 25-lb bag | 1 Bag Needed |
| Coverage Per 10-lb Bag (Your Tile) | 151.4 sq ft per 10-lb bag | 1 Bag Needed |
| Coverage Per 1-Quart Tub (Your Tile) | 50.6 sq ft per 1-quart tub | 3 Tubs Needed |
| Selected Grout Package Cost | 1 × 25-lb Bag @ $24.00 | $24.00 |
| Sealer, Silicone Caulk, Tools & Labor | Selected Accessories | $38.50 |
| Total Estimated Grouting Cost | Net Grout: 7.2 lbs + 10% Waste | $62.50 |
Cementitious vs. Epoxy Grout Performance
Deciding between standard Portland cement powder bags and two-part resin systems for a shower or kitchen backsplash? Read our detailed guide on cementitious grout vs. epoxy grout to compare waterproof stain resistance, working time, and cost per square foot.Preventing Cracked Grout with Proper Wall Prep
Even the strongest polymer grout will crack and crumble if your substrate flexes or absorbs moisture. Check our structural comparison of backer board vs. drywall before hanging tile in wet zones.Choosing the Right Tile Underlayment Board
Wondering how fiberglass-mesh cement panels compare to standard wallboard beneath mortar and grout joints? Explore our breakdown of cement board vs. gypsum board for floors, tub surrounds, and countertops.Filling Outdoor Patio Paver Joints Instead?
If you are sweeping polymeric joint sand or coarse bedding sand between exterior concrete patio stones rather than indoor ceramic tiles, switch over to our paver sand calculator for exact 50-lb bag and tonnage estimates.How Our Tile Grout Calculator & Grout Coverage Calculator Works
Grout consumption depends on four geometric variables: tile width ($W$), tile length ($L$), tile thickness ($T$), and grout joint width ($J$). Smaller mosaic tiles have up to 10 times more linear feet of joint line per square foot than 12×24 large-format tiles. Our grout estimator calculates the exact cubic inches of joint channel per square foot of tile using the Tile Council of North America (TCNA) volumetric equation, converts volume into dry powder weight or liquid quarts, and adds your chosen cleanup waste buffer.
| Tile Size (Width × Length) | Tile Thickness | Joint Width | 25-lb Bag Coverage | 10-lb Bag Coverage | 1-Quart Tub Coverage |
|---|---|---|---|---|---|
| 2" × 2" Mosaic Tile | 1/4" (0.25") | 1/8" (0.125") | ~75 sq ft | ~30 sq ft | ~10 sq ft |
| 3" × 6" Subway Tile | 5/16" (0.313") | 1/8" (0.125") | ~155 sq ft | ~62 sq ft | ~21 sq ft |
| 6" × 24" Wood-Look Plank | 3/8" (0.375") | 1/8" (0.125") | ~230 sq ft | ~92 sq ft | ~31 sq ft |
| 12" × 12" Floor Tile | 3/8" (0.375") | 3/16" (0.188") | ~245 sq ft | ~98 sq ft | ~33 sq ft |
| 12" × 24" Large Format | 3/8" (0.375") | 1/8" (0.125") | ~380 sq ft | ~152 sq ft | ~51 sq ft |
| 24" × 24" Jumbo Porcelain | 3/8" (0.375") | 1/8" (0.125") | ~565 sq ft | ~226 sq ft | ~76 sq ft |
Frequently Asked Questions
How many sf does a 25 lb bag of grout cover?
A 25-lb bag of grout covers between 50 and 565 square feet depending on your tile dimensions, tile thickness, and grout joint width. For standard 12×24-inch floor tiles (3/8-inch thick) with a 1/8-inch joint, one 25-lb bag covers roughly 375 to 400 square feet. For 12×12-inch tiles with a 1/4-inch joint, a 25-lb bag covers about 185 to 200 square feet. For classic 3×6-inch subway tiles with a 1/8-inch joint, expect 150 to 165 square feet, while small 2×2-inch shower pan mosaics only yield 65 to 80 square feet per 25-lb bag.
How do I calculate how much grout I will need?
To calculate how much grout you will need, use the four-step volumetric tile formula: (1) Add Tile Width + Tile Length (in inches) and divide by (Tile Width × Tile Length) to find your joint ratio; (2) Multiply that number by your Joint Width (in inches) × Tile Thickness (in inches) × 0.85 to get the approximate pounds of grout required per square foot; (3) Multiply by your total tiled square footage; and (4) Add 10% to 15% extra for surface float cleanup and bucket waste. Entering your tile measurements into our tile grout calculator above performs this exact calculation automatically.
How many sq ft will 10lbs of grout cover?
A 10-lb bag of grout covers between 25 and 225 square feet. Specifically, with a standard 1/8-inch grout joint, 10 lbs of grout covers approximately 150 square feet of 12×24-inch tile, 115 square feet of 12×12-inch tile, 62 square feet of 3×6-inch subway tile, or 28 to 32 square feet of 2×2-inch mosaic sheet tile. If you widen the grout lines to 1/4 inch on 12×12 tiles, a 10-lb bag covers roughly 75 to 80 square feet.
How much will 1 quart of grout cover?
One quart of premixed grout (which equals 57.75 cubic inches of volume or roughly 3.3 to 3.5 lbs of ready-to-use grout) covers between 9 and 75 square feet. With a tight 1/16-inch joint, 1 quart covers about 38 to 42 square feet of 3×6 subway tile or up to 95 square feet of 12×24 tile. With a standard 1/8-inch joint, 1 quart covers 20 to 22 square feet of 3×6 subway tile, 38 square feet of 12×12 tile, 50 square feet of 12×24 tile, or 9 to 11 square feet of 2×2 mosaic tile—making 1-quart tubs ideal for kitchen backsplashes, small bathroom floors, and shower niche repairs.