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Roof Tile Quantity Calculator

Work out roof tile quantity instantly with clear inputs, formula shown and shareable results.

About Roof Tile Quantity Calculator

Tile quantity is slope area times the tiles per square metre for the chosen tile and gauge, plus a cutting allowance for verges, valleys and breakage. Ridge tiles run about 2.5 per metre, and battens at a 300 mm gauge need roughly 3.3 metres of batten per square metre of roof.

Formulas

Tile count

Tiles = slope area x tiles per m² x (1 + wastage)

Battens

Batten metres = area / gauge in metres

Worked example

With the default values below, Roof Tile Quantity Calculator returns Tiles required of 1,323. Change any input above and every figure here is recalculated in your browser.

Inputs used

Roof slope areaminimum 0.1 m²
120 m²
Tiles per square metreminimum 0.5
10.5
Cutting and breakage allowanceaccepts 0–25 %
5 %
Ridge and hip lengthminimum 0 m
12 m

Results

Tiles required
1,323
Ridge tiles required
30
Batten length required
400.0 m
Tiles allowed for waste
63

Step by step

  1. 1Values used
  2. 2Tile count
  3. 3Battens
  4. 4Tiles required= 1,323
  5. 5Ridge tiles required= 30
  6. 6Batten length required= 400.0 m
  7. 7Tiles allowed for waste= 63

Assumptions and limits

  • The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 1 decimal place, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

How is the Roof Tile Quantity figure worked out?

Tiles = slope area x tiles per m² x (1 + wastage). Tile quantity is slope area times the tiles per square metre for the chosen tile and gauge, plus a cutting allowance for verges, valleys and breakage.

Why does tiles per square metre vary?

It depends on tile size and the batten gauge, which is set by the roof pitch: shallower pitches need more headlap, closer gauge and therefore more tiles per square metre.

What values do I need to enter?

This calculator takes 4 inputs: Roof slope area, Tiles per square metre, Cutting and breakage allowance, Ridge and hip length. The pre-filled defaults are a realistic worked example — replace them with your own site or project figures.

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