Roof Pitch Calculator
By BuildFolio Team · Last updated January 14, 2026
Find out your roof’s pitch (slope) without climbing a ladder. Roof pitch affects everything from material costs to walkability. Get your exact pitch from satellite data in seconds.
Common Roof Pitches
Quick Answer
Roof pitch is the slope of your roof, expressed as a ratio (like 6/12). The first number is how many inches the roof rises for every 12 inches of horizontal run. A 6/12 pitch rises 6 inches per foot. The easiest way to find your pitch is with our free roof report – no ladder required.
What Is Roof Pitch?
Roof pitch describes how steep your roof is. It’s written as two numbers separated by a slash, like “6/12” (read as “six-twelve” or “six in twelve”).
The First Number
How many inches the roof rises vertically.
The Second Number (Always 12)
The horizontal run – always 12 inches (one foot).
So a 6/12 pitch means the roof goes up 6 inches for every 12 inches (1 foot) of horizontal distance. The higher the first number, the steeper the roof.
Why pitch matters for homeowners
Steeper roofs cost more to replace (15-50% more for steep pitches). They also affect which roofing materials work best, and how much usable attic space you have. Knowing your pitch helps you get accurate quotes.
Roof Pitch Reference Chart
Here’s what different pitches look like and how they’re categorized:
| Pitch | Angle | Category | Notes |
|---|---|---|---|
| 1/12 – 2/12 | 5° – 9° | Flat/Low | Requires special materials (membrane, TPO) |
| 3/12 – 4/12 | 14° – 18° | Low Slope | Easy to walk on, good for shingles |
| 5/12 – 7/12 | 22° – 30° | Standard | Most common residential pitch |
| 8/12 – 10/12 | 34° – 40° | Steep | Harder to walk, adds 15-25% to labor |
| 11/12 – 12/12 | 42° – 45° | Very Steep | Special equipment needed, adds 25-50% |
| 12/12+ | 45°+ | Extreme | Rare, requires scaffolding |
Most Common Pitches
The most popular residential roof pitches are 4/12 through 7/12. A 6/12 pitch is considered “standard” – steep enough to shed water and snow effectively, but walkable for contractors.
How to Find Your Roof Pitch
There are three ways to determine your roof’s pitch:
1. Satellite Data (Easiest)
Our free roof report uses satellite imagery to calculate your pitch automatically. No ladder, no measuring – just enter your address.
2. From the Attic
Hold a level against a rafter. Measure 12 inches horizontal, then measure the vertical rise. That’s your pitch.
3. From Outside
Use a pitch gauge on your roof edge, or estimate by holding a level against a ladder placed on the roof.
Skip the ladder
Manual measurement requires climbing – either into your attic or onto your roof. Satellite-based tools like our free roof report give you the same data from the ground, plus your total square footage.
Why Roof Pitch Matters for Your Budget
Labor Costs
Steeper roofs are harder and more dangerous to work on. Contractors charge 15-50% more for steep pitches because they need safety equipment and work slower.
Material Waste
Steep roofs require more cuts and result in more wasted material. A 10/12 pitch can have 10-15% more material waste than a 4/12 pitch.
Material Options
Low-slope roofs (under 3/12) can’t use standard shingles – they need membrane roofing. Very steep roofs may need special fastening systems.
Insurance
Some insurers consider pitch when setting rates. Steeper roofs shed debris and water better, potentially qualifying for discounts.
Get Your Exact Roof Pitch – Free
Enter your address and get pitch, square footage, and more in 60 seconds.
Get Free Roof ReportFrequently Asked Questions
What is a normal roof pitch?
The most common residential roof pitches range from 4/12 to 7/12. A 6/12 pitch is often considered “standard” – it provides good water runoff while still being walkable for contractors.
How does pitch affect roofing cost?
Steeper pitches increase costs. A roof at 8/12 or above typically costs 15-25% more than a standard pitch roof. Very steep roofs (11/12+) can cost 25-50% more due to safety equipment requirements and slower work.
What’s the minimum pitch for shingles?
Most shingle manufacturers require a minimum 2/12 pitch, with 4/12 recommended for best performance. Below 2/12, you’ll need flat-roof materials like TPO, EPDM, or built-up roofing.
Is a steeper roof better?
It depends. Steeper roofs shed water, snow, and debris more effectively and often last longer. But they cost more to build and maintain, and provide less usable attic space. Most homeowners find 5/12 to 7/12 is the sweet spot.
How do I convert pitch to degrees?
To convert pitch to degrees, use: angle = arctan(rise/12). For example: 6/12 = arctan(6/12) = 26.57°. Our roof report includes both pitch and angle measurements.