Calculator
Tip: For garden paths, add 5–12% waste.Switch units, enter tile and joint details, then calculate epoxy grout needed by weight, volume, and kit count.
Example data table
Sample scenarios for garden surfaces. Use them to sanity-check your own inputs.
| Surface | Area (m²) | Tile (mm) | Joint (mm) | Depth (mm) | Waste % |
|---|---|---|---|---|---|
| Greenhouse walkway | 8 | 300×300 | 3 | 8 | 7 |
| Patio herb corner | 12 | 600×600 | 4 | 10 | 8 |
| Stone path edging | 5 | 200×100 | 5 | 10 | 10 |
| Outdoor sink splash zone | 3 | 100×100 | 3 | 6 | 6 |
Formula used
This calculator uses a practical grout-consumption approximation commonly applied to rectangular tiles. It estimates joint volume from tile perimeter density, then converts volume to weight using epoxy density.
Adjusted (kg) = Epoxy × PatternFactor × (1 + Waste%/100)
- A = tile length, B = tile width (mm)
- C = joint width (mm), D = joint depth (mm)
- ρ = epoxy density (kg/L)
- /1000 scales the mm-based volume estimate into liters
How to use this calculator
- Choose metric or imperial units based on your measuring tools.
- Enter total area to be grouted for the garden surface.
- Measure one tile’s length and width, then joint width.
- Set joint depth close to tile thickness for full joints.
- Enter epoxy density and kit size from the product label.
- Add a waste percentage for cleanup and small repairs.
- Click Calculate coverage to see kg, liters, and kits.
- Use the download buttons to save results as CSV or PDF.
Guidance for epoxy grout planning
Joint geometry drives consumption
Epoxy use rises quickly when joints get wider or deeper. A small change from 3 mm to 4 mm width increases joint volume by about 33%. Depth behaves the same way, so verify thickness at several points, especially on outdoor slabs and garden edging.
Tile size affects perimeter density
Smaller tiles create more joint length per square meter. For example, 100×100 tiles have far more perimeter than 600×600 tiles, so coverage per kit is lower. Mosaic accents, borders, and step risers should be calculated separately to avoid under-ordering.
Outdoor conditions add practical waste
Garden work often includes uneven bases, damp cleaning water, and faster skinning in warm weather. A 5–12% waste allowance is common for patios and paths, while detailed corners or textured stone may justify 12–18% depending on cleanup losses.
Density and kit size improve accuracy
Epoxy products vary in density, which changes the kg-to-liter conversion and affects how “full” a bucket feels. Use the product data sheet for density and the label for kit weight. If you mix partial kits, measure components carefully to keep curing consistent.
Buying strategy for uninterrupted work
Epoxy has limited working time once mixed. Rounding up to full kits helps finish a section without color shade shifts or rushed mixing. Split large areas into zones you can grout and clean within one pot life, then save your CSV or PDF for job notes.
Including grout lines around features
Garden layouts often include drains, planters, edging channels, and irrigation access covers. These features add extra joint length that is easy to overlook when you only measure the open floor area. If a feature interrupts the field tile, add its perimeter joints into your area plan by treating it as an additional “mini section” with the same tile and joint settings.
For best results, test a small patch first, confirm cleanup time, and log actual usage. Update your waste setting for the next garden zone consistently.
FAQs
1) Can I use this for garden stone pavers?
Yes, if the joints are reasonably consistent. Measure average joint width and depth across several pavers. For irregular stone, increase waste and consider calculating smaller zones so the estimate stays realistic.
2) What density should I enter if I cannot find it?
Use 1.6 kg/L as a practical default for many epoxy grouts. If your product feels unusually heavy or light, adjust within 1.5–1.8 kg/L, or confirm from the technical data sheet.
3) Why does diagonal pattern increase the result?
Diagonal layouts often create more cuts and small edge pieces. That raises joint interruptions and cleaning loss, so a pattern factor adds a realistic buffer for planning and purchasing.
4) Should joint depth equal the tile thickness?
In many installs, yes. Fully packed joints support durability and water resistance outdoors. If you intentionally grout shallow, enter the planned depth, but keep in mind shallow joints can trap debris on garden paths.
5) How accurate is the kit recommendation?
It is a planning estimate based on geometry, density, waste, and your chosen kit size. Actual coverage can vary with trowel technique and surface texture, so rounding up is safer for critical sections.
6) Can I export results for a work order?
Yes. After calculating, use the CSV for spreadsheets and the PDF for quick sharing. Save separate exports for each zone of your garden project to track material usage and costs.