Roofing Calculators
Hip Roof Area Calculator
Calculate total sloped area, ridge length, hip rafter length, and materials for a four-slope hip roof. Enter building dimensions and roof pitch to get instant results with adjustable waste factor.
Enter Dimensions
Results update automatically as you change inputs.
Hip Roof Visualization
Footprint Area
113.36 m²
1,220.08 ft²
Total Sloped Roof Area
119.49 m²
1,286.04 ft²
Ridge Length
4.00 m
13.12 ft
Common Rafter Length
4.53 m
14.86 ft
Hip Rafter Length
6.73 m
22.08 ft
Area with Waste (15%)
137.41 m²
1,478.95 ft²
Roofing Squares
14.79
1 square = 100 ft² (9.29 m²)
Pitch Multiplier
1.0541
Pitch Angle: 18.43°
Calculation Breakdown
Pitch Multiplier Reference Table
Multiply your footprint area by the pitch multiplier to get the true sloped roof area. For hip roofs, add 15–20% waste.
| Pitch Ratio | Angle (°) | Multiplier | Area Increase |
|---|
Gable Roof Calculator
Calculate gable roof area with two sloping sides. Compare gable vs hip roof costs and materials.
Calculate Gable Roof →Roof Area Calculator
General roof area calculator for any roof type. Get sloped area from footprint and pitch.
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View All Calculators →Frequently Asked Questions
Common questions about hip roof calculations
What is a hip roof?
A hip roof has four sloping sides that all meet at a ridge along the top. Unlike a gable roof, there are no vertical gable ends — every side slopes downward. Hip roofs are popular in Australia because they offer excellent wind resistance and provide consistent eave overhangs on all sides.
How is hip roof area different from gable roof area?
The total sloped area for both hip and gable roofs of the same footprint and pitch is actually the same (footprint area multiplied by the pitch multiplier). However, hip roofs typically require 15–20% more materials because the hip ridges create diagonal cuts that generate more waste.
Why do hip roofs need more waste allowance?
Hip ridges run diagonally from each corner to the ridge line, which means roofing materials (sheets, tiles, or shingles) must be cut at angles along these lines. This creates more offcuts that cannot be reused. A typical hip roof needs 15–20% waste allowance compared to 10% for a simple gable roof.
Are hip roofs more expensive than gable roofs?
Yes, hip roofs are typically 10–20% more expensive than gable roofs of the same size. The extra cost comes from more complex framing (hip rafters, jack rafters), additional ridge capping material along the hip lines, and greater material waste from angled cuts.
What is a hip rafter?
A hip rafter is the diagonal structural member that runs from the corner of the building up to the end of the ridge board. It sits at the intersection of two adjacent roof slopes. Hip rafters are longer than common rafters and carry loads from the jack rafters on either side.
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