Roof materials
Ridge cap calculator
Estimate ridge cap quantity. Roof replacement with ridge cap.
Try the calculation
Use ridge and hip length that the selected cap covers.
Adjustable example. Change these illustrative inputs to match your task, then recalculate. Reset restores the example and its result.
Understand the result
How this calculation works
Ridge and hip cap quantity uses the length covered by the selected cap product.
Steps
- Add the ridge and hip runs that use the same cap.
- Enter the product coverage per bundle.
The form starts with the worked example below. Change its values and selections to match your task; Reset restores the example.
Formula
bundles = ceiling(covered length ÷ coverage).
Variables and units
- Ridge/cap length (ft)
- Required. Use a positive value. Starting example: 120. Replace it for your task.
- Coverage (ft)
- Required. Use a positive value. Starting example: 20. Replace it for your task.
What the result means
It counts product packages for the measured cap runs; it does not classify which runs require caps.
Worked example
Inputs: Ridge/cap length = 120; Coverage = 20.
Calculation: 120 ft ÷ 20 ft per bundle = 6 bundles.
Result: 6 bundles.
Frequently asked questions
Should ridge and hips be measured separately?
Yes, then add only the runs using the same product.
Does the result include starter caps?
No, accessories remain a separate scope.
Can coverage vary by product?
Yes, use the label or manufacturer coverage for the selected product.