Flooring & Tile · Project planning

Grout Calculator

Estimate joint volume from tile face dimensions, joint width and fill depth, then apply a product consumption factor to determine mass and packs.

By Alish Gautam, Software Developer · Updated 4 October 2026 · Calculation methodology

Start with the editable example below. Dimensions retain their physical size when units change. Region sets currency labels without converting currencies; confirm entered quotes after changing region.

Measured tiled surfaces

Use non-overlapping rectangles. Enter openings as area on the surface they interrupt.

Room / surface 1

Tiled surface label

Surface length / run (ft)

Surface width (ft)

Untiled opening area (ft²)

Product settings

Product and system dimensions

Tile face length (in)Editable arithmetic example. Replace with your project or product specification.

Tile face width (in)Editable arithmetic example. Replace with your project or product specification.

Tiles per boxEditable arithmetic example. Replace with your project or product specification.

Joint width (in)Editable arithmetic example. Replace with your project or product specification.

Joint fill depth (in)Editable arithmetic example. Replace with your project or product specification.

Product consumption factor (kg/L)Editable arithmetic example. Replace with your project or product specification.

Grout package mass (kg)Editable arithmetic example. Replace with your project or product specification.

Product / specification referenceOptional supplier product name, chart revision or quote reference, saved in shared project state.

Advanced settings

Advanced planning settings

Purchase allowance (%)Planning allowance, not a code or industry requirement. Set zero to order the exact rounded takeoff.

Cost settings · USD

Optional quote prices

Price per purchased pack / unitOptional supplier quote in the selected currency. Blank omits cost.

Project takeoff

Whole packages round up. Allowance is separate from purchased surplus. Prices omit labor, delivery, tax and other items unless explicitly entered.

Gross measured area: 120 ft²
Opening / exclusion deductions: 0 ft²
Geometric joint volume: 1.452 L
Net requirement: 2.323 kg
Allowance: 0.232 kg
Planned requirement: 2.556 kg
Unrounded package requirement: 0.511
Grout packs: 1
Purchased coverage: 5 kg
Surplus beyond planned requirement: 2.444 kg

Supplier-ready material list

Grout packs: 1

Geometry / layout breakdown

Dimensions use the selected measurement system.
Surface	Material	Gross (ft²)	Net (ft²)
Room / surface 1	floor	120	120

This repeated-grid geometry omits perimeter details and profile variations. Enter product kg/L from technical data; the example factor is not a universal grout density.

How it works

Joint fraction = 1 − tile face area / (tile length + joint) / (tile width + joint). Litres = surface area × fraction × joint depth × 1,000.

Assumptions and limitations

This repeated-grid geometry omits perimeter details and profile variations. Enter product kg/L from technical data; the example factor is not a universal grout density.

Whole packages round upward after the chosen allowance. Physical geometry and purchase reserve are separate. Manufacturer and project specifications override editable examples; the selected region does not establish a local code requirement.

Sources and boundaries

MAPEI: Grout Products and Technical Documentation

Open the source · Product library · Reference checked 2026-10-04

Scope: Product-specific grout data

Used for: Product consumption and package-data lookup.

Does not establish: A universal kg/L factor; An unverified manufacturer formula.

Use the current product document to verify numerical inputs. Calculator uses explicitly described geometric joint volume with a user-entered consumption factor.