Use 1 for flat footprint area, or a higher multiplier for roof slope.
Set to 0 to skip package rounding.
Complexity and cost
Optional allowance for hips, valleys, dormers or extra cuts.
Optional. No currency conversion is applied.
Result updated. Roofing material area: 1232 sq ft.
Result summary
Roofing estimate
Main project estimate from the values entered.
1232 sq ft
Package coverage is shown in sq ft. This is a material-area estimate only.
Key numbers
- Sloped area
- 1120 sq ft
- Packages
- 37 packages
Key takeaway
The estimate suggests about 1232 sq ft of roofing material area, including pitch, complexity and waste assumptions.
Project details
Roofing details
- Footprint area
- 1000 sq ft
- Sloped area
- 1120 sq ft
- Packages
- 37 packages
- Estimated cost
- Not estimated
Check these assumptions
- No complexity allowance is included for hips, valleys, dormers or unusual cuts.
- Roof shape, access, flashing, underlayment, drainage, safety and local requirements are not included.
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How this roofing calculator works
The calculator multiplies the roof footprint by a pitch factor, then applies optional complexity and waste allowances. If package coverage is entered, the result rounds up to whole bundles or sheets.
Assumptions
This is a material-area estimate from the values entered. Roof shape, access, flashing, underlayment, drainage, safety and local requirements can change real quantities.
What this calculator does not include
This calculator does not inspect roof condition, assess structural safety, calculate labour, give permit guidance or provide building, engineering, roofing or cost-guarantee advice.
Key terms and assumptionsShort notes about pitch factor, roof squares, waste allowance, complexity and scope limits.
- Pitch factor
- Pitch factor multiplies the horizontal footprint area to account for roof slope.
- Roof square
- In US roofing, one roof square is commonly 100 square feet. The calculator still shows the main area result in square feet.
- Complexity allowance
- Complexity allowance is an optional extra percentage for hips, valleys, dormers and unusual cuts.
- Material estimate only
- Roof shape, access, flashing, underlayment, drainage, safety and local requirements are not included.
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FAQs
How is roof area estimated?
The calculator multiplies footprint area by a pitch factor, then adds complexity and waste allowances.
What is a pitch factor?
A pitch factor is a multiplier that adjusts horizontal footprint area for roof slope.
Does this include dormers or valleys?
Only if you add a complexity allowance. The calculator does not model roof geometry.
Does this estimate shingles or sheets?
It can estimate packages if you enter coverage per bundle or sheet.
Is this roofing advice?
No. It is a rough material estimate only, not roofing, building, engineering or safety advice.
Can I use metric units?
Yes. Metric mode uses metres and square metres. Unit changes alter labels and defaults only.
Does this include flashing or underlayment?
No. This version focuses on main roofing material area.