Tile Grout & Whole Kits

When to use it

This example is for complete two-part epoxy grout kits (A+B), with no added mixing water. Do not compare mixed-product mass with the dry powder mass of a cement-grout bag.

For one rectangular tile size, one grout product and one colour. Enter the depth required by the product’s estimating method and the actual joint conditions. The metric example is illustrative; density and kit size are editable.

Related: Tile Quantities & Full Boxes and Tile Adhesive & Whole Bags.

Inputs

Calculation method

Estimated kg/m² = (1/tile length + 1/tile width) × depth × joint width × mixed density, with physical units carried through. Multiply by tiled area, then by 1 + allowance. Divide by kit mass and round up. At 3 mm joints: 0.24 kg/m², 4.8 kg theoretical and 5.28 kg planned; two 3 kg kits buy 6 kg, 0.72 kg above the plan.

(1/600 [Tile length mm] + 1/300 [Tile width mm]) × 10 [Depth used by the product’s estimating method mm] × 3 [Joint width mm] × 1.6 [Mixed-product density g/cm³] → Estimated grout per unit area kg/m²

Estimated grout per unit area kg/m² × 20 [Tiled area m²] → Theoretical grout mass kg

Theoretical grout mass kg × (1 + 10 [Extra allowance]%) → Planned mass including allowance kg

ceil(Planned mass including allowance kg/3 [Total net mass per kit kg]) → Whole kits to buy

Whole kits to buy × Total net mass per kit kg → Purchased net mass kg

Purchased net mass kg-Planned mass including allowance kg → Mass above the plan kg

Change one input

Change only joint width from 3 to 5 mm. Use becomes 0.4 kg/m²; the plan is 8.8 kg, requiring three kits totalling 9 kg, with 0.2 kg above the plan.

Results are displayed to at most two decimal places; later formulas use unrounded values.

Scope and limits

• One tile size, product and colour; no stock deduction.
• Density is for the mixed product.
• Surplus is a planning mass difference, not reusable mixed grout.

Tile dimensions, depth, joint width, density and kit mass must be positive; area and allowance nonnegative. This manufacturer-style approximation is not an exact count of every joint in a finite room. Surface texture, actual joint shape and application losses affect consumption. The 1.6 g/cm³ density and 10% allowance are example inputs, not universal product values. Whole-kit mass means all components together; this is not a mixing-ratio or cartridge-sealant calculator.

Sources: Weber input guide, MAPEI technical sheet, 2022 UK archive.

Download and import into Calvance to edit the numbers. The canvas does not reject every invalid input; check the stated ranges.

Common questions

Can I use the number printed in a rounded coverage table?

Use the product’s appropriate estimating method and density. Rounded table entries can differ from a calculation using unrounded inputs; do not infer density from them.

Can I keep the calculated surplus after mixing?

Not necessarily. The difference is purchased mass minus the plan. Pot life, batch mixing and storage suitability are outside this calculation.

How to import your template

We recommend using the latest version of Calvance.

1. Save the file. Choose Download template and save the .calvx file to Files on your iPhone or iPad. From a computer, you can send it to your device with AirDrop.
2. Open Import. In All Canvases in Calvance, tap the add button to open the template screen, then choose Import.
3. Choose the file. Select the saved .calvx file to create your own canvas. Importing uses one canvas from your allowance.
4. Edit and check. Check the results against the worked example, then add your numbers. Duplicate the canvas to keep different versions.

Download .calvx file