Flooring & Tiles

Tile Grout Calculator

Estimate dry grout from tiled area, tile dimensions, joint width, depth, and material density.

Flooring & tile estimate

Enter the measured surface and product size for Tile Grout Calculator

Method for this tool

What the Tile Grout Calculator actually calculates

The estimate multiplies (tile length plus width) divided by tile face area by joint width, joint depth, tiled area, density, and the waste factor. This approximates a regular rectangular joint network. Joint intersections, irregular edges, cleanup losses, and product formulation can change consumption; it does not calculate mixing water.

The calculation path

The standard joint-volume formula estimates grout volume and converts it to mass using grout density.

Inputs that can change the answer

Tiled area: Enter tiled area in m².
Tile length: Enter tile length in mm.
Tile width: Enter tile width in mm.
Joint width: Enter joint width in mm.
Joint depth: Enter joint depth in mm.
Grout density: Enter grout density in kg/L.
Waste: Percentage applied at the stage shown in the method; enter 10 for ten percent.

Checks that stay outside the formula

Tile thickness, joint profile, and cleanup loss can change actual consumption.

A practical order for entering the data

Enter the tiled area in square metres and both tile dimensions in millimetres.
Enter the joint width, intended filled depth, and product-appropriate grout density or consumption factor.
Add a waste percentage and compare the kilogram estimate with the grout manufacturer's coverage data.

Project walkthrough: Plan tile quantity, grout, adhesive, and layout together

Engine check using the prefilled sample

Flooring example: tiled area = 20 m², tile length = 600 mm, tile width = 600 mm, joint width = 3 mm, joint depth = 9 mm, grout density = 1.7 kg/L and waste = 10 %. Replace the sample dimensions and pack information with the measured floor and the exact product format you intend to order.

Results for these inputs

Dry grout estimate: 3.37 kg

Project-specific method

Worked example and purchase checks

The grout estimate uses tile perimeter relative to tile face area, then applies joint width, joint depth, tiled area, and material density. The selected reserve is applied after the theoretical mass is calculated.

Illustrative worked example

An 18 m² field of 600 × 300 mm tiles uses nominal 3 mm joints filled to an estimated 8 mm depth.

Exact inputs for this example

Tiled area	18 m²
Tile length	600 mm
Tile width	300 mm
Joint width	3 mm
Joint depth	8 mm
Grout density	1.7 kg/L
Waste	10 %

Dry grout estimate: 4.04 kg

How to read the result

Compare the estimated kilograms with the manufacturer consumption or yield information, then round to actual bag or tub sizes. Keep movement-joint materials and sealants outside this grout quantity.

Assumptions this example makes

Tile dimensions, joint width, and joint depth use millimetres as labelled.
The tiled field is broadly regular and the chosen joint dimensions are consistent.
The entered density is suitable for the exact grout product being considered.

What this calculator does not prove

Joint profiles, tile-edge shapes, movement joints, mosaics, cleanup loss, and partial-depth filling are not modelled.
A manufacturer consumption table can supersede this geometric estimate for a specific product.

Tile faces and the joints between themSketch is explanatory, not to scale.

Mistakes that change this result

Entering centimetres where the fields require millimetres.
Using tile thickness as joint depth without checking how fully the joint will be filled.
Assuming one density or bag yield applies to cementitious, epoxy, and resin products alike.