0Running out of tiles halfway through a renovation is one of the most common (and most frustrating) problems homeowners face. Whether you’re creating a statement splashback, retiling a bathroom, or updating an outdoor area, accurate measurements are essential. Not only does precise planning save money, but it also prevents installation delays and ensures your chosen tiles come from the same batch for a consistent look.
Fortunately, calculating how many tiles you need is easier than it seems—and with Oscar & Co’s range of tiles available in a wide selection of sizes and finishes, you’re well placed to find the perfect fit for your space.
Below, we break down the process step-by-step and share practical tips to help you buy with confidence.
1. Measure Your Space Correctly
Start by calculating the total area you need to tile.
Use this simple formula:
Area = Length × Width
Measure in metres for accuracy. For example:
A bathroom wall that is 3m long and 2.4m high will have a surface area of:
3 × 2.4 = 7.2 square metres
If you’re tiling multiple walls or surfaces, calculate each one separately and add them together for a final total.
Tip: Don’t forget niche shelves, splashback return walls, or stair risers—these smaller sections often get overlooked.
2. Check the Tile Size and Coverage
Tile packaging usually indicates how many square metres each box covers. This makes it easy to work out how many boxes you’ll need.
For instance:
If your chosen tile covers 1.44 sqm per box, and you need 7.2 sqm, divide:
7.2 ÷ 1.44 = 5 boxes
Round up—not down—since you can’t buy partial boxes.
If the tiles are sold individually, calculate how many tiles fit into one square metre, then multiply by your total area.
3. Always Include Wastage (It’s Non-Negotiable)
No matter how skilled your tiler is, there will always be some wastage due to cuts, breakages, pattern matching, and layout adjustments.
A good rule of thumb is:
- Add 10% for standard straight-lay patterns
- Add 15% for herringbone, chevron, or diagonal layouts
- Add 20% for tiles above 600mm, natural stone, or spaces with many corners and cut-outs
Example:
If your total area is 7.2 sqm and you’re adding 10% wastage:
7.2 × 1.10 = 7.92 sqm
Round up to 8 sqm worth of tiles.
4. Consider the Tile Layout and Pattern
Your tile pattern affects how many tiles will need to be trimmed or discarded.
- Straight lay patterns require the least waste.
- Offset or brick bond patterns usually need extra cuts.
- Herringbone and chevron patterns require careful planning and can significantly increase your material requirement.
If you’re still deciding on layout, measure and calculate based on the most complex option. It’s always better to have more tiles than less.
5. Factor in Batch Variations
Tiles can vary slightly in shade and size between batches. Running short means you may have to order more from a different batch—leading to noticeable differences on your floor or wall.
Why this matters:
- Colour variation may be subtle or obvious
- Grout lines can appear uneven
- Your final finish may look inconsistent
Calculating your quantities accurately the first time prevents this issue and ensures a seamless result.
6. Account for Special Features and Edge Pieces
If your project includes trims, feature tiles, borders, or mosaics, calculate them separately. Feature sections often require more precise measuring because they don’t follow the same dimensions as your main tile.
Don’t forget to factor in:
- Tile edges for exposed corners
- Mosaic sheets for curved or detailed areas
- Floor-to-wall transitions
- Decorative tile inserts
7. Double-Check Before You Buy
Before making your final purchase:
- Recheck your measurements
- Confirm the tile batch and shade code
- Ensure you’ve included the correct wastage percentage
- Verify box coverage with the retailer
- Consider ordering an extra box for future repairs
A few minutes of extra checking can save you hours of headaches later.
Calculating tile quantities doesn’t need to be complicated
With a clear understanding of your space, the tile size, and the required wastage, you can confidently order what you need without fear of running short. For homeowners, DIY renovators, and designers alike, planning ahead ensures a stress-free installation and a beautifully consistent finish.
