6/12 Pitch Roof — Architectural (dimensional) shingles Calculator

6/12 pitch (slope factor 1.1180) — material quantities and costs for Architectural (dimensional) shingles. Compare all materials rated for this pitch. Step-by-step slope factor derivation.

Roof dimensions

Floor-plan footprint

Roof pitch (rise/12)

Material & waste

Roofing material

Roof complexity (waste factor)

Total bundles

18.4

Roofing squares

1,677

Actual roof sq ft

5,903

Total weight (lbs)

Slope factor: 1.1180Waste: +10%Dead load: 3.5199999999999996 psf

Footprint area	1,500 sq ft
Actual roof area	1,677 sq ft
With waste (10%)	1,845 sq ft
Roofing squares	18.4
Main bundles	56
Starter bundles	1
Ridge cap bundles	1
Total bundles	58
Total weight	5,903 lbs (2.68 t)
Eave linear ft (est.)	77 lf

Materials rated for 6/12 pitch — 1,500 sq ft comparison

9 materials rated for 6/12 pitch.

Material	Category	Weight/sq	Bundles (1,500 ft²)	Installed cost	Lifespan
Architectural (dimensional) shingles	Asphalt	320 lbs/sq	56 bundles	$9,224	25–50 yrs	← current
3-tab asphalt shingles	Asphalt	230 lbs/sq	56 bundles	$6,457	15–25 yrs	-
Standing seam metal roofing	Metal	65 lbs/sq	19 bundles	$20,292	40–70 yrs	-
Corrugated metal roofing (exposed fastener)	Metal	55 lbs/sq	19 bundles	$9,224	25–40 yrs	-
Wood shakes	Wood	420 lbs/sq	74 bundles	$19,370	20–40 yrs	-
Cedar shingles	Wood	270 lbs/sq	74 bundles	$16,603	20–35 yrs	-
Natural slate	Tile	850 lbs/sq	19 bundles	$46,119	75–200 yrs	-
Clay tile	Tile	1000 lbs/sq	19 bundles	$27,671	50–100 yrs	-
Concrete tile	Tile	950 lbs/sq	19 bundles	$17,525	30–50 yrs	-

6/12 pitch — slope factor and angle

Slope factor: 1.1180 — for every 100 sq ft of floor plan, the actual roof surface is 111.8 sq ft.

Pitch angle: 26.6° from horizontal.

Moderate slope — very common, balanced aesthetics/cost

Category: moderate. Standard walking surfaces — no special safety equipment required.

Compared to a flat roof (factor 1.0), a 6/12 pitch requires 11.8% more roofing material.

6/12 pitch — area and bundle count by home size

Slope factor: 1.1180. 10% gable waste included.

Footprint	Actual roof area	Squares	Bundles (Architectural (dimensional) shingles)
500 sq ft footprint	559 sq ft	6.15 squares	19 bundles
1,000 sq ft footprint	1,118 sq ft	12.30 squares	37 bundles
1,500 sq ft footprint	1,677 sq ft	18.45 squares	56 bundles
2,000 sq ft footprint	2,236 sq ft	24.60 squares	74 bundles
2,500 sq ft footprint	2,795 sq ft	30.75 squares	93 bundles
3,000 sq ft footprint	3,354 sq ft	36.90 squares	111 bundles

Installed cost comparison — materials for 6/12 pitch

Visual Analysis1 series9 points

Interactive bar view for 1 series and 9 sampled points, built for quick reading and clear comparison.

Trend

Upward

Min

350

Max

2.5K

Insight

Installed cost per square (USD) shows an upward pattern, with a visible peak around Natural slate at 2.5K.

X-axis: MaterialY-axis: Installed cost per square ($)

Installed cost comparison — materials for 6/12 pitch

6/12 slope factor — formula and derivation

Slope factor = √(rise² + run²) ÷ run,For 6/12: √(6² + 12²) ÷ 12 = √180 ÷ 12 = 1.118034,This is the hypotenuse of a right triangle with legs 6" and 12".,Every 12" of horizontal run, the roof surface travels 13.416" along the slope.

Sources & Standards

International Code Council. "International Residential Code for One- and Two-Family Dwellings." 2024 Edition.Building code requirements for concrete, framing, and structural calculations
American Concrete Institute. "Building Code Requirements for Structural Concrete (ACI 318-19)."Concrete mix ratios, strength requirements, and reinforcement standards

6/12 Pitch Roof — Architectural (dimensional) shingles Calculator

6/12 pitch (slope factor 1.1180) — material quantities and costs for Architectural (dimensional) shingles. Compare all materials rated for this pitch. Step-by-step slope factor derivation.

Roof dimensions

Floor-plan footprint

Roof pitch (rise/12)

Material & waste

Roofing material

Roof complexity (waste factor)

Total bundles

18.4

Roofing squares

1,677

Actual roof sq ft

5,903

Total weight (lbs)

Slope factor: 1.1180Waste: +10%Dead load: 3.5199999999999996 psf

Footprint area	1,500 sq ft
Actual roof area	1,677 sq ft
With waste (10%)	1,845 sq ft
Roofing squares	18.4
Main bundles	56
Starter bundles	1
Ridge cap bundles	1
Total bundles	58
Total weight	5,903 lbs (2.68 t)
Eave linear ft (est.)	77 lf

Materials rated for 6/12 pitch — 1,500 sq ft comparison

9 materials rated for 6/12 pitch.

Material	Category	Weight/sq	Bundles (1,500 ft²)	Installed cost	Lifespan
Architectural (dimensional) shingles	Asphalt	320 lbs/sq	56 bundles	$9,224	25–50 yrs	← current
3-tab asphalt shingles	Asphalt	230 lbs/sq	56 bundles	$6,457	15–25 yrs	-
Standing seam metal roofing	Metal	65 lbs/sq	19 bundles	$20,292	40–70 yrs	-
Corrugated metal roofing (exposed fastener)	Metal	55 lbs/sq	19 bundles	$9,224	25–40 yrs	-
Wood shakes	Wood	420 lbs/sq	74 bundles	$19,370	20–40 yrs	-
Cedar shingles	Wood	270 lbs/sq	74 bundles	$16,603	20–35 yrs	-
Natural slate	Tile	850 lbs/sq	19 bundles	$46,119	75–200 yrs	-
Clay tile	Tile	1000 lbs/sq	19 bundles	$27,671	50–100 yrs	-
Concrete tile	Tile	950 lbs/sq	19 bundles	$17,525	30–50 yrs	-

6/12 pitch — slope factor and angle

Slope factor: 1.1180 — for every 100 sq ft of floor plan, the actual roof surface is 111.8 sq ft.

Pitch angle: 26.6° from horizontal.

Moderate slope — very common, balanced aesthetics/cost

Category: moderate. Standard walking surfaces — no special safety equipment required.

Compared to a flat roof (factor 1.0), a 6/12 pitch requires 11.8% more roofing material.

6/12 pitch — area and bundle count by home size

Slope factor: 1.1180. 10% gable waste included.

Footprint	Actual roof area	Squares	Bundles (Architectural (dimensional) shingles)
500 sq ft footprint	559 sq ft	6.15 squares	19 bundles
1,000 sq ft footprint	1,118 sq ft	12.30 squares	37 bundles
1,500 sq ft footprint	1,677 sq ft	18.45 squares	56 bundles
2,000 sq ft footprint	2,236 sq ft	24.60 squares	74 bundles
2,500 sq ft footprint	2,795 sq ft	30.75 squares	93 bundles
3,000 sq ft footprint	3,354 sq ft	36.90 squares	111 bundles

Installed cost comparison — materials for 6/12 pitch

Visual Analysis1 series9 points

Interactive bar view for 1 series and 9 sampled points, built for quick reading and clear comparison.

Trend

Upward

Min

350

Max

2.5K

Insight

Installed cost per square (USD) shows an upward pattern, with a visible peak around Natural slate at 2.5K.

X-axis: MaterialY-axis: Installed cost per square ($)

Installed cost comparison — materials for 6/12 pitch

6/12 slope factor — formula and derivation

Sources & Standards

International Code Council. "International Residential Code for One- and Two-Family Dwellings." 2024 Edition.Building code requirements for concrete, framing, and structural calculations
American Concrete Institute. "Building Code Requirements for Structural Concrete (ACI 318-19)."Concrete mix ratios, strength requirements, and reinforcement standards