Equal-Pitch Hip Roof Geometry calculator.
Combine two trapezoidal and two triangular planes of a specified symmetric hip roof.
Your inputs
Use measurements from your plan and properties from your chosen product. Any prefilled values are illustrative.
A clear estimate starts here.
Enter your dimensions and product details to see the quantity and purchase breakdown.
Formula and assumptions
How this calculation works.
Equal pitches imply a ridge equal to plan length minus plan width. Unequal pitches, offset ridges, dormers and penetrations require separately measured planes.
A worked example
Illustrative inputs only. Product properties and design dimensions are not recommendations for your project.
- Specified rectangular plan length
- 6 m
- Specified rectangular plan width
- 4 m
- Specified vertical rise
- 1.5 m
Four-plane roof area: 30 m²
Geometry of a symmetric equal-pitch hip roof over the supplied plan, which must already include the intended eave projection. No slope, load, structure or drainage requirement is selected.
Before you purchase
Use dimensions from your plan and properties from your chosen product. Any design spacing, section or fixing pattern must already be specified.
Equal pitches imply a ridge equal to plan length minus plan width. Unequal pitches, offset ridges, dormers and penetrations require separately measured planes.
Dimensions, quantities, prices, timing and product properties are supplied by you. This tool does not select construction specifications or assess structural, electrical or hydraulic suitability.
Method: dimensional arithmetic and user-supplied specifications. Software checks: 2026-10-04. Calculation and review policy.