What is a standard roof pitch?

In the United States, the most common "standard" roof pitches range from 4:12 to 6:12 (18.4° to 26.6°). A 4:12 pitch is the minimum recommended slope for standard asphalt shingles without additional waterproofing.

What is the steepest roof pitch?

While there is no absolute maximum, pitches above 24:12 (63.4°) are extremely rare. The steepest commonly used residential pitch is around 12:12 (45°). A-frame structures can reach 24:12 where the roof effectively becomes the exterior wall.

What roof pitch is best for snow?

For heavy snow regions, a pitch of 6:12 (26.6°) or steeper is recommended. At 6:12, snow begins to slide off naturally. In extreme snow areas, 8:12 to 12:12 (33.7°–45°) is preferred.

How do I measure my roof pitch without going on the roof?

Use a speed square or level from inside your attic: place a level against a rafter, measure 12 inches along it, then measure straight up to the rafter. That vertical measurement is your pitch (X:12). Or use a smartphone inclinometer app from the ground.

What pitch do I need for solar panels?

The ideal pitch depends on latitude. In the US, most installations perform best at 15°–35° (roughly 3:12 to 8:12). A 30° angle (approximately 7:12) is often cited as optimal for year-round energy production.

Is a 3/12 roof pitch too flat for shingles?

A 3:12 pitch is marginal for asphalt shingles. Most manufacturers require double underlayment at 2:12–4:12. Below 2:12, use membrane systems (TPO, EPDM). For reliability, 4:12 or steeper is recommended.

Roof Pitch Chart

The complete roof pitch reference table — every pitch from 1:12 to 24:12 with angle, slope %, multiplier, rafter length, and compatible materials. Search, filter, and find exactly what you need.

Interactive Roof Pitch Chart — 1:12 to 24:12

The most comprehensive roof pitch reference table available online. Search by pitch value or angle, filter by category, and click any row to try it in our free calculator.

Pitch	Angle	Slope %	Multiplier	Rafter (20ft)	Category	Materials
1:12	4.8°	8.3%	1.003	20.1 ft	Flat Roof	Built-Up Roofing (BUR), Single-Ply Membrane (TPO/EPDM), Modified Bitumen
2:12	9.5°	16.7%	1.014	20.3 ft	Flat Roof	Built-Up Roofing (BUR), Single-Ply Membrane (TPO/EPDM), Modified Bitumen
3:12	14.0°	25.0%	1.031	20.6 ft	Low Slope	Standing Seam Metal, Corrugated Metal Panels, Asphalt Shingles
4:12	18.4°	33.3%	1.054	21.1 ft	Low Slope	Standing Seam Metal, Corrugated Metal Panels, Asphalt Shingles
5:12	22.6°	41.7%	1.083	21.7 ft	Standard	Standing Seam Metal, Corrugated Metal Panels, Asphalt Shingles
6:12	26.6°	50.0%	1.118	22.4 ft	Standard	Corrugated Metal Panels, Asphalt Shingles, Wood Shakes
7:12	30.3°	58.3%	1.158	23.2 ft	Standard	Corrugated Metal Panels, Asphalt Shingles, Wood Shakes
8:12	33.7°	66.7%	1.202	24.0 ft	Standard	Corrugated Metal Panels, Asphalt Shingles, Wood Shakes
9:12	36.9°	75.0%	1.250	25.0 ft	Standard	Corrugated Metal Panels, Asphalt Shingles, Wood Shakes
10:12	39.8°	83.3%	1.302	26.0 ft	Steep	Corrugated Metal Panels, Asphalt Shingles, Wood Shakes
11:12	42.5°	91.7%	1.357	27.1 ft	Steep	Corrugated Metal Panels, Asphalt Shingles, Wood Shakes
12:12	45.0°	100.0%	1.414	28.3 ft	Steep	Corrugated Metal Panels, Asphalt Shingles, Wood Shakes
13:12	47.3°	108.3%	1.474	29.5 ft	Very Steep	Corrugated Metal Panels, Asphalt Shingles, Wood Shakes
14:12	49.4°	116.7%	1.537	30.7 ft	Very Steep	Corrugated Metal Panels, Asphalt Shingles, Wood Shakes
15:12	51.3°	125.0%	1.601	32.0 ft	Very Steep	Corrugated Metal Panels, Asphalt Shingles, Wood Shakes
16:12	53.1°	133.3%	1.667	33.3 ft	Very Steep	Corrugated Metal Panels, Asphalt Shingles, Wood Shakes
17:12	54.8°	141.7%	1.734	34.7 ft	Very Steep	Corrugated Metal Panels, Asphalt Shingles, Wood Shakes
18:12	56.3°	150.0%	1.803	36.1 ft	Very Steep	Corrugated Metal Panels, Asphalt Shingles, Wood Shakes
19:12	57.7°	158.3%	1.873	37.5 ft	Very Steep	Corrugated Metal Panels, Asphalt Shingles, Wood Shakes
20:12	59.0°	166.7%	1.944	38.9 ft	Very Steep	Corrugated Metal Panels, Asphalt Shingles, Wood Shakes
21:12	60.3°	175.0%	2.016	40.3 ft	Very Steep	Corrugated Metal Panels, Wood Shakes, Clay / Concrete Tile
22:12	61.4°	183.3%	2.088	41.8 ft	Very Steep	Corrugated Metal Panels, Wood Shakes, Clay / Concrete Tile
23:12	62.4°	191.7%	2.162	43.2 ft	Very Steep	Corrugated Metal Panels, Wood Shakes, Clay / Concrete Tile
24:12	63.4°	200.0%	2.236	44.7 ft	Very Steep	Corrugated Metal Panels, Wood Shakes, Clay / Concrete Tile

Rafter length is calculated for a 20-foot building span (10-foot run per side). Multiplier = √(1 + (pitch/12)²). All values computed with IEEE 754 precision.

How to Read a Roof Pitch Chart

Reading a roof pitch chart is straightforward once you understand the columns. Follow these three steps to find any value you need.

Find Your Pitch

Locate your roof pitch ratio (X:12) in the leftmost column of the chart. This is the number of inches your roof rises for every 12 inches of horizontal run.

Read Across

Move right to see the equivalent angle in degrees, slope percentage, pitch multiplier (for area calculation), and rafter length for a standard 20-foot span.

Check Compatibility

Look at the category badge and materials column to confirm which roofing materials are compatible with your pitch and whether your slope meets building code requirements.

Pro Tip

If you already know your angle or slope percentage, use our Roof Pitch Calculator to reverse-calculate the pitch ratio and see all related values instantly.

Roof Pitch Categories Explained

Every roof pitch falls into one of five categories. Each category has distinct characteristics that affect drainage, material choice, cost, and walkability.

Flat Roof0–2:12 (0–9.5°)

Near-level roofs that allow rooftop access and HVAC placement. Require membrane waterproofing systems rated for ponding water.

Commercial buildings, modern homes, garages

TPO, EPDM, Modified Bitumen, BUR

Low Slope2–4:12 (9.5–18.4°)

Gentle slopes common in ranch-style homes. Offer a balance between modern aesthetics and basic water drainage.

Ranch homes, sheds, lean-to additions

Standing Seam Metal, Shingles (with underlayment)

Standard4–9:12 (18.4–36.9°)

The most popular range for residential construction. Balances drainage performance, material compatibility, cost, and walkability.

Most residential homes, colonial, Cape Cod

Asphalt Shingles, Metal, Clay Tile

Steep9–12:12 (36.9–45°)

High-pitched roofs that excel at shedding snow and rain rapidly. Difficult to walk on — professional installation required.

Tudor style, Victorian, snow country homes

Slate, Wood Shakes, Premium Shingles

Very Steep12+:12 (45°+)

Extreme pitches used for dramatic architectural statements. Requires specialized roofing equipment and safety measures.

A-frames, mansard roofs, church steeples

Slate, Standing Seam Metal, Specialty Tile

Why Roof Pitch Matters for Your Project

Choosing the right roof pitch is one of the most consequential decisions in any roofing project. It affects everything from your material budget to long-term maintenance costs.

Water Drainage

Steeper = Better

Faster water runoff reduces leak risk
Less debris accumulation on the surface

Flatter = Better

Simpler gutter and downspout design
Less turbulent runoff during storms

Material Compatibility

Steeper = Better

Opens up premium options (slate, wood shakes)
Shingles perform better at 4:12 and above

Flatter = Better

Membrane systems are cost-effective on low slopes
Standing seam metal works down to 1:12

Construction Cost

Steeper = Better

More dramatic curb appeal adds resale value
Better attic space for storage or living area

Flatter = Better

Less roofing material needed (smaller surface area)
Shorter rafters and simpler framing

Safety & Climate

Steeper = Better

Snow slides off before dangerous accumulation
Better ventilation reduces moisture buildup

Flatter = Better

Safer for maintenance — easier to walk on
Lower wind profile reduces storm damage risk

Common Roof Pitch Applications

Each pitch range is favored for specific building types and architectural styles. Use this guide to understand what pitch best matches your project.

Pitch Range	Common Projects	Why This Pitch
1–2:12Flat	Commercial flat roofs Carports & garages Modern home extensions	Maximizes usable floor area below. Allows rooftop equipment (HVAC, solar) placement. Cost-effective for large spans.
3–4:12Low Slope	Ranch-style homes Utility sheds & barns Lean-to additions	Clean, low-profile aesthetic popular in mid-century and contemporary design. Good drainage without excessive material cost.
5–7:12Standard	Traditional residential homes Colonial & Cape Cod styles Garden offices	The "sweet spot" — compatible with nearly all materials, easy to walk on for maintenance, and meets all standard building codes.
8–12:12Steep	Victorian & Tudor homes Snow-country cabins Craftsman bungalows	Excellent snow and rain shedding. Creates dramatic curb appeal and maximizes attic living space. Ideal for regions with heavy precipitation.
12+:12Very Steep	A-frame cabins Church steeples Mansard roofs	Used for strong architectural statements. The roof essentially becomes the wall in A-frame designs. Requires specialized installation and safety equipment.

Know your project type?

Plug the recommended pitch into our calculator to get exact measurements for your build.

Related Tools

Need to calculate specific values? Try our free calculator.

Frequently Asked Questions About Roof Pitch

Answers to the most common questions about roof pitch, based on what homeowners, contractors, and builders ask most often.