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Use our free roof cricket slope calculator to find cricket height, valley slope, slope percent, and angle. Get fast results with simple steps.
| Formula | Meaning |
|---|---|
| Sr = Rise / 12 (or %/100, or Rise/Run) | Main roof slope as a dimensionless ratio |
| H = Sr x (W / 2) | Cricket rise, symmetric full-diamond geometry only |
| Sv = H / Lv | Valley slope -- Lv must match the selected valley measurement type |
| %, in/ft, degrees | 100 x Sv | 12 x Sv | atan(Sv) x 180/PI |
Water can pool on a flat roof. A roof cricket helps move it away from chimneys, walls, and roof units. It forms a raised section that guides water toward a drain.
Our free roof cricket slope calculator helps you find the rise and slope of a roof cricket. Enter your roof slope, cricket width, and valley size to get your results.
You can use this tool for home repairs, new builds, and metal roof plans. It saves time and makes roof math much easier.
A roof cricket is a small, raised roof section. It helps water flow around an object instead of pooling behind it.
The cricket slope tells you how much the surface rises over a set run. A steeper slope can help water flow, but the right slope depends on the roof system and its design.
For a simple, symmetric roof cricket, use these formulas.
1. Main roof slope ratio
Roof slope ratio = rise / horizontal run
For a slope of 0.25 inches per 12 inches:
Slope ratio = 0.25 / 12 = 0.020833
2. Cricket height formula
Cricket height = main roof slope ratio × (full cricket width / 2)
3. Valley slope formula
Valley slope ratio = cricket rise / horizontal valley run
Slope percentage = valley slope ratio × 100
Slope in inches per foot = valley slope ratio × 12
Slope angle = arctan(valley slope ratio) × 180 / π
Note that actual diagonal valley length differs from horizontal run. If you enter the diagonal length, first find the horizontal run. Use this formula when the rise and diagonal length describe the same straight segment:
Horizontal run = √(diagonal length² − rise²)
These formulas assume a simple cricket shape. Other roof layouts may need other measurements.
Enter the main roof slope. Choose a format, such as inches per 12 inches or percent.
Add the cricket width. Enter the full width and select the right unit.
Enter the valley size. Choose actual diagonal length or horizontal run, based on your measurement.
Select your output unit. Use inches or millimeters if the tool offers that choice.
Calculate your result. Review the cricket rise, valley slope, percent, and angle. Check the units before you use the values.
Suppose your roof slope is 0.25 inches per 12 inches. Your cricket is 8 feet wide, and its diagonal valley is 12 feet long.
First, convert the width to inches.
8 × 12 = 96 inches
Next, find the rise.
Rise = (0.25 / 12) × (96 / 2)
Rise = 1 inch
Now, convert the diagonal length to inches.
12 × 12 = 144 inches
Find the horizontal run.
Horizontal run = √(144² − 1²)
Horizontal run ≈ 143.997 inches
Then, find the valley slope.
Slope ratio = 1 / 143.997 ≈ 0.0069446
Slope percent ≈ 0.69446%
Slope in inches per foot ≈ 0.08334
Slope angle ≈ 0.398 degrees
This example shows the math for a simple roof shape. It does not prove that the slope meets your roof's drainage needs.
A roof cricket helps direct water away from roof objects. Our roof cricket slope calculator makes it easier to find the rise and slope from key measurements.
Use the result as a design estimate. Before building, check your roof plan, local codes, and roofing maker's rules. A roofer can help confirm that water will drain as needed.
A 22.5-degree angle gives a slope ratio of about 0.4142. That equals a rise of about 4.97 inches per 12 inches of horizontal run.
Divide the rise by the horizontal run. For a percent, multiply that ratio by 100. For an angle, use the arctan of the ratio.
Yes. You can use a metal roof cricket slope calculator to estimate the rise and valley slope. Still, check the metal roof maker's rules and your roof design.
A cricket helps guide water around chimneys, walls, and other roof objects. It can reduce water pooling when designed and built well.
It can give accurate math for the shape and inputs it supports. Real roof layouts may need more data, so check the design before work begins.