Roof Pitch Calculator | Calculate Roof Slope in Seconds – Metric & Degrees
Quick, accurate and easy to use
Our Roof Pitch Calculator helps you instantly calculate your roof pitch in degrees, rise-to-run ratio, and metric measurements. Whether you’re figuring out the roof slope/pitch for new shingles, metal roofing, a gazebo kit or a Bali hut roof replacement — this tool gives you precise results in seconds.
Roof pitch, roof slope, and angle refer to the same concept, so we will use these terms interchangeably on this page.
Pro Tip:
The simplest method is to lay your phone flat on the roof and use our digital level/clinometer app below (or the Measure app on iPhone). This will immediately display the precise roof pitch in degrees. See Measure With Our Roof Pitch Calculator Now >
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Roof Pitch Calculator Australia – Metric & Degrees
Use our fast and accurate Roof Pitch Calculator to measure your roof slope in seconds. It works in both degrees and metric measurements (rise over run).
Perfect for figuring out roof pitch for shingles, metal roofing, tiles, pergolas, or any roofing project across Australia.
Roof Pitch Calculator – Measure Roof Slope Here
Measure Roof Pitch Now
Works on Android & iPhone (Safari)
Pro Tip: Use the roof pitch calculator by placing your phone flat on the roof and using the digital level app. This tool effectively provides the exact roof pitch in degrees, ensuring precise calculations for your roofing needs.
How to Use Our Roof Pitch Calculator
Our roof pitch calculator is simple and user-friendly. You can measure your roof slope in seconds using just your phone — no special tools required.
Step 1: Position your phone flat against the roof surface.
Lay your phone directly on the roof slope.
Step 2: Tap “Measure Pitch Now”
Tap anywhere in the box to start the live measurement.
Step 3: Allow Motion Access
When prompted, allow your browser to access motion sensors (required for iPhone and Android).
Understanding Your Results
You’ll instantly see the exact roof pitch in degrees, plus the common Australian formats (rise-to-run ratio and the roof slope percentage).
Roof Pitch Calculator | Roof Pitch = Rise/Run
Enter any two values below, and the third will be calculated automatically. All pitch results are updated in real time.
- Rise = The height from the bottom to the top of the roof.
- Run = Horizontal distance between the roof ridge and the wall of the building.
- Rafter = Sloping length of rafter (hypotenuse)
Roof Pitch Calculator – “Because It’s Not Just a Home, It’s a Castle!”
Using our Roof Pitch Calculator to plan the perfect roof for your own Aussie castle
Common Roof Pitches in Australia
| Pitch (Degrees) | Rise/Run | Best For |
| 9.5° | 2/12 | Minimum roof pitch for asphalt shingles |
| 15° | 3.2/12 | Minimum roof pitch for most roof tiles (sarking required) |
| 22.5° | 5/12 | Most popular home roof pitch in Australia |
| 35° | 8.4/12 | Common Bali Hut roof slope with Excellent Water Runoff |
Steps Involved Include Deciding on the Correct Roof Pitch
Step 1: Plan Your Roof
Think about how you want to use the space, the style you like, and the type of roofing material you’ll be using.
Step 2: Live Measurement
Use our Roof Pitch Calculator by placing your phone on the roof or entering your rise and run measurements.
Step 3: Get Instant Results
Instantly see the exact roof pitch in degrees, rise: run ratio, and percentage of roof slope.
Perfect Pitch – Perfect Roof
Choosing the right roof pitch ensures excellent water runoff, strong wind resistance, and a beautiful finished look that will last for decades.
What Is Roof Pitch and Why Does It Matter?
Roof pitch (also called roof slope) is the steepness or angle of your roof. It is usually measured in degrees or as a rise:run ratio (for example, 25 degrees or 5/12).
Getting the correct roof pitch is very important when planning any roofing project — especially for gazebos, pergolas, carports, and Bali huts.
The right pitch ensures:
- Proper water runoff (preventing leaks and pooling)
- Better wind resistance
- Longer lifespan for your roofing materials
- The best possible appearance for your outdoor structure
Complex Gazebo Designs with Different Roof Pitches
Planning a multi-sided gazebo? Hexagonal (6-sided), octagonal (8-sided), or other complex designs often need more detailed calculations for rafters and layout.
For these projects, we recommend using Blocklayer’s Gazebo Roofing Calculator. It’s an excellent free tool that lets you input your roof pitch, rafter spacing, overhang, and many other options to generate accurate cutting lists and layouts.
This is especially useful when designing hexagonal, octagonal, or irregular-shaped gazebos and pavilions.
Create an Impactful Statement with a Dual Roof Pitch Tiered Gazebo
This stunning two-tiered gazebo on Hope Island, Gold Coast, is a perfect example of how different roof pitches can create real architectural impact.
The upper tier features a steeper 30° pitch, while the lower tier sits at a more relaxed 20° pitch. Finished with beautiful dual black laminated asphalt shingles, the result is a dramatic, high-end look that stands out in any backyard.
Using multiple roof pitches like this not only looks impressive but also improves water runoff and adds visual interest to your outdoor space.
Roof Pitch vs Roof Angle vs Roof Slope
Roof pitch, roof angle, and roof slope all refer to the same thing — how steep your roof is. Our Roof Pitch Calculator shows results in degrees (roof angle) as well as the traditional rise:run ratio (roof pitch) for maximum clarity.
The Importance of the Right Roof Pitch in Australia
Choosing the correct roof pitch is crucial in Australia. A proper pitch ensures excellent water runoff during heavy rain, prevents leaks and water pooling, reduces the risk of wind damage, and helps your asphalt shingles or other roofing materials perform at their best for decades.
Using Our Gazebo Roof Calculator With Your Correct Roof Pitch Measurement
Once you’ve measured your roof pitch, you can use our handy gazebo roof calculator to plan your project accurately. This is especially useful when replacing thatch on a Bali hut, building a new fixed gazebo, or designing a roofed pergola.
Common Roof Pitches for Gazebos and Pergolas in Australia
Here are the most popular roof pitches used for gazebos, pergolas, and outdoor structures across Australia:
9.5° Roof Pitch
This is the minimum recommended pitch for asphalt shingles. Suitable for metal, polycarbonate, and asphalt shingle roofs. Tiles and slate are not recommended on such low slopes.
22.5° Roof Pitch
The most popular choice for gazebos and pergolas in Australia. Offers a great balance between appearance and water runoff.
25° Roof Pitch
Excellent water runoff while maintaining a classic, elegant look. Highly recommended for most residential gazebos.
30° Roof Pitch
Creates a traditional steep gable roof style with strong visual impact and very good water shedding.
35° Roof Pitch
Very common for Bali huts. Provides fast water runoff and a dramatic appearance.
45° Roof Pitch
A very steep pitch often used for dramatic architectural features, steeples, or American-style homes.
Garden Pergola With Standard 22.5° Degree Roof Pitch
The 22.5° roof pitch is the most popular choice for garden pergolas across Australia. It offers the perfect balance between a classic elegant look and excellent water runoff.
This beautiful pergola in Fawkner Park, Melbourne is a great real-world example. We re-roofed this historic structure using our premium asphalt shingles on a 22.5° pitch — proving just how well this angle performs and looks in Australian conditions.
Optimal Roof Pitch for Gable Roofs
The ideal roof pitch for gable roofs depends on your design, location, and local rainfall. Most Australian homeowners choose between 20° and 25° for gable roof gazebos and pergolas. This range gives excellent water runoff while maintaining a classic, attractive appearance. Use our Roof Pitch Calculator to quickly find the perfect angle for your gable roof project.
Understanding the Importance of Accurate Roof Pitch for Your Project
Using the correct roof pitch is critical for the long-term success of your project. An incorrect pitch can cause poor shingle performance, water pooling, leaks, and much higher maintenance costs over time. A well-chosen steeper roof angle helps roofing materials last significantly longer. This is especially important for Bali hut conversions, asphalt shingles, and Western Red Cedar roofs. Our Roof Pitch Calculator helps you choose the right pitch the first time — saving you time, money, and future headaches.
Asphalt Shingles and Calculating Roof Pitch
Asphalt shingle roofing systems are suitable for a wide range of roof angles. Use our Roof Pitch Calculator to determine the correct application method for your project.
Low Slope Application (9.5° – 18.5°)
A roof slope in this range is considered low. For these angles, a double layer of synthetic roof underlay is required for proper waterproofing.
Standard Slope Application (18.5° – 60°)
This is the most common range for residential roofs. Standard shingle and underlay application applies — no special steps needed.
Steep Slope Application (60° – 90°)
For very steep roofs, shingles must be glued by hand. Apply a dab of roofing adhesive (the size of a 10-cent piece) to each corner of every shingle tab to seal the front edge.
Requirements for Roof Pitch Using Slates, Terracotta Tiles, and Concrete Tiles
Most tiles (including terracotta and concrete) require a minimum roof pitch of 15°.
- Between 15° and 20°: Sarking (underlay) must be installed under the tiles to ensure proper water runoff.
- Above 20°: Sarking requirements are reduced, but still recommended in high-rainfall areas.
For full technical requirements, refer to the National Construction Code (NCC):
Part 7.3 Roof Tiles and Shingles – NCC 2022
Always check with your local council or a qualified roofer, as specific tile manufacturers may have stricter pitch requirements.
Frequently Asked Questions
What is roof pitch and how is it measured?
Why does roof pitch matter when choosing roofing materials?
What is the most common roof pitch in Australia?
How accurate is this roof pitch calculator?
Can I use this calculator for metal roofing, tiles, or shingles?
What is the minimum roof pitch for asphalt shingles in Australia?
Roof Pitch Calculator for Australia
Roof pitch calculator – Common roof pitches – Degrees – Rise: Run ratios – Best uses
Regions We Serve Throughout Australia
We supply and deliver high-quality DIY gazebo kits and pergola roofing solutions Australia-wide, including all major cities and regional areas.
Our main service areas include:
- Melbourne & Victoria
- Sydney & New South Wales
- Brisbane & Queensland
- Gold Coast & South East Queensland
- Perth & Western Australia
- Adelaide & South Australia
- Tasmania, ACT & Northern Territory
Utilise our roof pitch calculator to determine your precise roof pitch effortlessly. We deliver premium DIY gazebo kits and pergola roofing solutions to all regions across Australia, including rural and regional postcodes, with delivery fees calculated at checkout based on your location.
Ready to Get the Right Shingles for Your Roof?
Now that you know your roof pitch, our team can help you choose the perfect shingles that match your roof angle, style, and Australian climate.
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