Overview
Enter the building length, width, roof pitch, waste percentage, and coverage per pack or sheet. The calculator estimates the roof area, adds the selected waste allowance, and converts the result into the number of packs or sheets needed.
Use cases
- Estimating how much roof tile you need.
- Planning roofing material orders for a gable roof.
- Checking whether a membrane or sheet quantity is sufficient.
- Getting a quick material estimate before requesting a quote.
How it works
- 1
Enter the building length and width in meters.
- 2
Set the roof pitch in degrees.
- 3
Choose the waste percentage for cuts and overlaps.
- 4
Provide the coverage per pack or sheet in square meters.
- 5
Get the roof area, total area with waste, and required quantity.
Examples
Example calculation
Input: Length 10 m, width 8 m, pitch 30°, waste 10%, coverage 1.2 m2 per pack
Output: The tool returns the roof area, roof area with waste, and packs needed.
Helpful for a fast pre-order estimate.
Tiles needed estimate
Input: Any simple gable roof with known pitch and coverage per tile pack
Output: See how many roof tiles or bundles to buy.
Useful when searching for how many roof tiles you need.
FAQ
Does this calculator work for complex roofs?
It is based on a simple gable roof assumption. For hips, valleys, dormers, or irregular shapes, use it only as a rough estimate.
Can I use it to estimate roof tiles?
Yes. Enter the coverage per pack or sheet to estimate how many roof tiles, sheets, or bundles you need.
What does the waste percentage mean?
It accounts for cuts, overlaps, and typical installation losses.
Is the result exact?
No, it is an estimate. Always verify with the material manufacturer and your roofer.