Tools Tile Waste Calculator

Tile Waste Calculator

Generic tile calculators tell you to add 10%. That's a guess. Herron calculates waste from your actual room shape and layout pattern — so you know exactly how many tiles to buy, not roughly.

Why "Add 10%" Is Wrong

Every tile calculator you've used says the same thing: measure your area, multiply by tile size, add 10% for waste. Maybe 15% if you're feeling cautious. It sounds reasonable. It isn't.

The 10% rule ignores everything that actually determines waste. A herringbone pattern in a small bathroom can waste 20% or more because every tile meets the wall at 45 degrees, producing triangular offcuts that rarely fit anywhere else. A straight lay in a large rectangular room might waste under 5%. Same tiles. Wildly different numbers.

Room shape matters just as much as pattern. An L-shaped room has more wall edges than a rectangle, which means more cuts. A narrow hallway forces cuts on every other row. A room with an alcove or chimney breast creates even more edge waste that no flat percentage can predict.

Tile size plays a role too. Large-format tiles in a small room mean a higher proportion of tiles get cut. Small mosaic tiles in the same room waste almost nothing. The percentage depends on the relationship between your tile, your pattern, and your geometry — not a rule of thumb someone wrote on a forum in 2009.

The result of guessing? You either buy too many packs (wasted money, boxes cluttering your garage) or too few (mid-project panic, dye lot mismatches when you reorder, and a week's delay while you wait for delivery).

How Herron Calculates Waste (Without Guessing)

Herron doesn't use a formula. It runs a simulation.

You draw your room — the actual shape, including alcoves, bay windows, obstacles, whatever you've got. You pick your tile dimensions and your layout pattern. Then Herron does what a tiler does, but computationally:

  1. Lays every tile in your chosen pattern across the full room area
  2. Clips each tile to the room boundary, calculating the exact cut shape where tiles meet walls
  3. Identifies reusable offcuts — pieces cut from one tile that can fill a gap elsewhere, reducing waste
  4. Counts what's actually needed — full tiles, cut tiles, reused offcuts, and genuine waste

This is the same clipping and nesting logic used in industrial CNC software, applied to your bathroom floor. The waste number it gives you isn't a percentage bolted onto an area calculation. It's the real number, derived from every tile position in your specific layout.

See your actual waste, not a guess

Draw your room, pick your tile and pattern, and get a precise material count in minutes.

What You Get

After Herron runs the layout, you see a full breakdown of your project materials:

  • Waste percentage — the real number for your room and pattern, not a generic estimate
  • Exact tile count — how many individual tiles your layout uses, including partial cuts
  • Pack count — rounded up to whole packs based on your tile's pack size, so you order correctly
  • Cost estimate — total material cost based on your price per pack or per square metre
  • Full, cut, and reused breakdown — see which tiles are laid whole, which are trimmed at edges, and which offcuts are reused elsewhere in the layout

You also get a visual layout showing every tile in position, colour-coded by status. Cut tiles are highlighted so you can see exactly where edge waste happens and whether adjusting your starting point or pattern offset would reduce it.

Frequently Asked Questions

Does it work for herringbone and other patterns?

Yes. Herron supports straight lay and herringbone, with more patterns coming. Herringbone is where accurate waste calculation matters most — the 45-degree cuts produce significantly more waste than straight patterns, and the exact amount depends heavily on your room dimensions and tile size. A generic percentage is least reliable precisely where it matters most.

What about L-shaped rooms and obstacles?

Herron handles any room shape you can draw — L-shapes, U-shapes, rooms with chimney breasts, kitchen islands, or pillars. You draw the outline, add obstacles, and the tiling engine clips tiles to the actual boundary. More complex shapes mean more cuts, and Herron accounts for every one of them.

Is it free to use?

Drawing your room, choosing a pattern, and seeing the visual layout with waste percentage and material estimates is free. The detailed cut list — a numbered, row-by-row guide for actually cutting and laying each tile — is a paid feature.

Related Guides

Stop guessing. Start planning.

Draw your room, pick your tiles, and get an exact material count in minutes.