Calculated result
3bags
Grout bags to order
Formula
FLOOR-GROUT-001Area × joint width × joint depth × (L + W) ÷ (L × W) × (1 + waste) ÷ bag yield
120 ft²
Tiled area
0.234 ft³
Net grout volume
0.258 ft³
Volume including waste
Flooring calculator
Tile grout calculator
Grout volume and bag count from tile size, joint width, joint depth and floor area.
By Feroz Sheikh · Formula FLOOR-GROUT-001 v1.0.0 · Tested formula
Formula
FLOOR-GROUT-001v1.0.0Project inputs
Enter your measurements. Switching units converts the same project, including coverage and unit rates. Package yields keep the unit printed beside each field.
Refine measurements and rates at any time. Your current values are included in the material-list PDF.
Planning estimate, not engineering advice. Confirm site measurements and product specifications. Calculation limits.
This calculator returns grout volume and bag count from tile size, joint width, joint depth and floor area. Formula FLOOR-GROUT-001 v1.0.0. Thinset is a different bag. Add the count to an estimate. Confirm the yield on the bag you will mix.
- Measure the finished tiled area.
- Enter the actual tile face and joint dimensions, not a generic coverage chart.
- Use the yield printed on the selected grout bag.
Size chart
Tile grout chart (12 in tile, ⅜ in joint, 10% waste)
Thinset is a different bag. Confirm the yield on the bag you will mix.
| Floor | Primary | Check |
|---|---|---|
| 8 × 8 ft | 2 bags | 64 ft² |
| 10 × 10 ft | 3 bags | 100 ft² |
| 12 × 10 ft | 3 bags | 120 ft² |
| 16 × 12 ft | 5 bags | 192 ft² |
Metric example — 4 × 3 m tiled floor. A 4 × 3 m floor of 12 in tile with ⅜ in joints returns 4 bags.
- TCNA. Tile, grout and thinset are separate materials. Coverage and joint size come from the product you will install. Tile Council of North America
Add your project costs
Enter supplier prices and any labour, equipment or delivery costs. Pick a currency — badges, inputs, and totals follow.
Costs use the carton or square-foot rate you type. Construclytic does not fetch store prices. Underlayment, grout, thinset and labour stay companion lines. For GCC projects, select QAR, AED, SAR, KWD, OMR or BHD and enter local supplier rates.
How this calculator works
A transparent tile grout calculator takeoff.
Feroz SheikhWritten by Feroz Sheikh · founder
This calculator estimates grout volume from tiled area, tile face, joint width and joint depth, then divides by the selected bag yield after a visible mixing allowance.
Grout volume is joint width × depth × length of joints, then bags from the labelled yield. A 12×24 plank and a 2×2 mosaic do not share a bag count. Thinset is a different product.
Worked example. Example: a 12 ft × 10 ft floor of 12 × 12 in tile with 3/8 in joints 3/8 in deep needs about 0.234 ft³ of grout. With 10% waste and 0.09 ft³ bag yield, the order rounds to 3 bags.
See the example inputs and calculated result
This separate example uses the calculator's starting values in imperial units. It stays unchanged when you edit the tool above. Example rates, yields and dimensions are assumptions, not recommendations for your project.
| Input | Example value |
|---|---|
| Floor length | 12 ft |
| Floor width | 10 ft |
| Tile length | 12 in |
| Tile width | 12 in |
| Joint width | 0.375 in |
| Joint depth | 0.375 in |
| Bag yield | 0.09 ft³ / bag |
| Waste factor | 10 % |
Example result: Grout bags to order — 3 bags.
Area × joint width × joint depth × (L + W) ÷ (L × W) × (1 + waste) ÷ bag yield
Use the labelled units above when reproducing this example. To work in metric, switch the calculator to Metric; applicable measurements are converted, while product-specific units remain labelled.
- 1. Measure the finished tiled area.
- 2. Enter the actual tile face and joint dimensions, not a generic coverage chart.
- 3. Use the yield printed on the selected grout bag.
Field notes that change the number
- Rectified tile with a 1/16 in joint uses far less grout than a 3/8 in quarry tile.
- Wall and floor grouts are often different SKUs.
- Sealer is extra.
Common mistakes
- Using floor area as grout volume.
- Mixing sanded and unsanded yields.
- Forgetting that a mosaic sheet is mostly joint.
Need the broader workflow? Read the flooring planning guide.
How-to: Thinset bags: use the coverage for your product and trowel · Grout quantity: why tile size and joint width change the bags · How to order floor tile packages
Questions
Questions about tile grout calculator
Does this include thinset?
No. Thinset or mortar coverage depends on trowel size and back-buttering; keep it as a separate line.
Why is bag yield required?
Sanded, unsanded and pre-mixed grouts have different yields. The bag label is the source of truth.
How much grout for a 12x10 tile floor?
A 12 × 10 ft floor of 12 in tile with ⅜ in joints and 10% waste returns 3 bags. Thinset is a different bag.
Does joint width change the bag count a lot?
Yes. A ⅛ in joint and a ⅜ in joint are different volumes. Measure the joint you will actually tool.
What is the formula ID?
This tile grout calculator publishes formula FLOOR-GROUT-001, version 1.0.0. The ID stays on the result and on the estimate line.