Hip Roof Area Calculator

Estimate hip roof area from building length, width, pitch, overhangs, and roof sections. Calculate sloped roof area, hip and ridge references, roof squares, shingle bundles, underlayment rolls, waste, and roofing cost.

Calculate Hip Roof Area

Hip Roof Area ≈ Flat Footprint Area × Slope Factor. Slope Factor = √(rise² + run²) ÷ run.
Your result will appear here.

How the hip roof area calculator works

Building dimensions mode:
The calculator adjusts the roof length and width for overhangs, calculates flat footprint area, then multiplies by the roof pitch slope factor.

Known flat area mode:
The calculator uses your known flat roof footprint area and multiplies it by the slope factor to estimate sloped hip roof area.

Known roof area mode:
The calculator uses your known roof area directly, then estimates roof squares, bundles, underlayment, waste, and cost.

Roofing estimate:
The calculator estimates roof squares, shingle bundles, underlayment rolls, material cost, labor cost, tear-off cost, and total roofing cost.

Why use a hip roof area calculator?

A hip roof area calculator helps estimate roofing square footage for roofs that slope on all sides. It is useful for shingles, metal roofing, underlayment, sheathing, roof coating, tear-off planning, and labor estimates.

It can help calculate roof area, pitch factor, ridge length, hip length, roof squares, shingle bundles, underlayment rolls, waste, material cost, labor cost, and estimated total roofing cost.

What your result means

Your result shows flat footprint area, hip roof area, roof area with waste, pitch angle, slope factor, estimated ridge length, estimated hip length, roof squares, shingle bundles, underlayment rolls, material cost, labor cost, tear-off cost, and estimated total cost.

Hip roof area formulas

Frequently asked questions

How do I calculate hip roof area?

For a quick estimate, multiply the flat roof footprint area by the roof pitch slope factor. Then add waste for hips, ridges, cuts, and roof complexity.

Does a hip roof need more waste than a gable roof?

Usually yes. Hip roofs often have more cut pieces around hips and ridges, so many estimates use a higher waste percentage than simple gable roofs.

How many roof planes does a hip roof have?

A simple hip roof usually has four sloped roof planes, but complex homes can have multiple hip sections.

How many square feet are in a roofing square?

One roofing square equals 100 square feet of roof area.

Is this hip roof area calculator exact?

No. It is an estimate. Actual hip roof area can vary by roof geometry, hips, valleys, dormers, pitch changes, multiple sections, overhangs, product coverage, and waste.