A 3/12 roof pitch — also referred to as “3 over 12” — is a low to moderate slope that offers basic drainage and a subtle roofline. “3 over 12” means the roof rises 3 inches for every 12 inches of horizontal run. This works out to an angle of approximately 14.04 degrees, providing more runoff ability than flatter pitches.
What Does a 3-12 Roof Pitch Represent?
With a 3/12 pitch, the roof increases 3 inches in height for every foot of horizontal distance. This equals an angle of about 14.04 degrees and a slope of 25%. It’s a practical choice for homeowners looking for a low-profile design with better drainage than flat or near-flat roofs.
- Pitch: 3/12 (or “3 over 12”)
- Angle in Degrees: 14.04°
- Slope Percentage: 25%
- Rafter Length (per 12 inches of run): Approximately 12.37 inches
Need to check your roof pitch? Use our Roof Pitch Calculator App for quick results.
Is a 3-12 Roof Pitch a Good Choice?
Yes — a 3/12 pitch offers a nice middle ground for homeowners wanting low-slope aesthetics with some improved drainage. While not as steep as mid-range or high-slope roofs, it performs better than flatter options, especially with the right materials. Here’s why it works:
- Improved runoff over flatter designs
- Works well with metal roofing, membrane systems, and specially designed shingles
- Low-profile appearance that suits modern and ranch-style homes
- Safer access for maintenance and inspections
Installation & Cost Insights
A 3/12 pitch roof is easier to install than steeper slopes and generally keeps labor costs lower. However, using proper low-slope materials is important to ensure waterproofing and longevity.
How Does a 3/12 Pitch Compare in Degrees to Other Roof Slopes?
At about 14.04 degrees, a 3/12 pitch offers more drainage than a 2/12 pitch but is still flatter than average residential slopes like 4/12 or 6/12. It provides a balance of affordability and function.
What is the Angle in Degrees for a 3-12 Roof Pitch?
The angle of a 3/12 roof pitch is approximately 14.04 degrees. To see how this compares to other slopes, check our complete roof pitch chart.
Knowing your roof’s angle helps ensure proper material selection and accurate installation, especially for lower slope designs.
Where Do You See 3/12 Roof Pitches?
The 3/12 pitch is commonly found in homes looking for a modern profile while maintaining basic drainage performance. You’ll often see this pitch in:
- Ranch-style homes — Clean lines with practical slope for moderate runoff
- Mid-century modern designs — Low-slope roofs for sleek architecture
- Detached garages and workshops — Simple, cost-effective roofing
- Covered patios and porches — Directs water away without a steep look
- Dry or moderate climates — Performs well with proper materials
Builders appreciate the 3/12 pitch for its balance of visual appeal, ease of installation, and performance in mild to moderate climates.
Overall, the 3/12 roof pitch is a versatile choice that offers affordability and function, especially when paired with the right materials for your climate.