A familiar situation
Planen Sie eine erste Menge an Dachdeckung aus Grundrissfläche und Dachanstieg.
How to use this calculator
- Enter building footprint area, roof rise, waste allowance.
- Select Calculate to see the answer and its breakdown.
- Keep a scenario, change an input and compare the results.
Use consistent units and check the assumptions below before applying the result.
How roofing is calculated
Estimate roof covering area from the building footprint, roof pitch, and waste allowance. The pitch multiplier converts horizontal plan area to sloped surface area; valleys, dormers, overhangs, and complex geometry may require a measured takeoff. A 1,000 ft² footprint at a 6:12 pitch has about 1,118 ft² of sloped area before waste. The calculation validates each input and keeps its stated units explicit. The roof rises 6 inches for every 12 inches of horizontal run. This is an estimate for the stated assumptions; confirm measurements and any applicable professional or local standards before relying on it.
roof area = footprint × √(1 + (rise/run)²)A 1,000 ft² footprint at a 6:12 pitch has about 1,118 ft² of sloped area before waste.
Assumptions & useful context
The result depends on the values you enter and the method described above. Displayed numbers may be rounded; calculations use the unrounded values. Check that this model matches your situation before relying on it.
Frequently asked questions
What does 6:12 pitch mean?
The roof rises 6 inches for every 12 inches of horizontal run.
How much waste should I add?
It depends on roof complexity, material, and installation pattern; use a contractor’s takeoff for ordering.