Roof Tiles Calculator
Number of tiles for a pitched roof, from the plan dimensions and the pitch angle.
Results
Tiles needed
1198
Area
92.38
m²
Area
80.00
m²
Height
2.309
m
What this tool does
A sloping roof always covers more surface than its footprint, and the steeper it gets the bigger the gap: at 45° you need over 40 % more material than the plan area suggests. Tiles per square metre comes from the manufacturer and depends on the lap you use.
Formula
actual area = plan area ÷ cos(pitch) ; tiles = area × tiles/m²
Variables
| Symbol | Meaning | Unit |
|---|---|---|
l | Length | m |
w | Width | m |
pt | Roof pitch | ° |
tm | Tiles per square metre | — |
ws | Waste allowance | % |
N | Tiles needed | — |
AR | Area | m² |
AP | Area | m² |
RH | Height | m |
Worked example
- Length10 m
- Width8 m
- Roof pitch30 °
- Tiles per square metre12
- Waste allowance8 %
- Tiles needed1198
- Area92.38 m²
- Area80.00 m²
- Height2.309 m
Limitations
- The result is an estimate based only on the values you type. Real situations often include factors this calculator does not know about.
- Coverage and consumption figures vary between products. Take the values from the manufacturer's datasheet for the product you are actually using.