Roofing Calculator

The Roofing Calculator estimates the total cost to replace or install a roof based on your home's dimensions, pitch, and chosen materials. Enter your house length, house width, roof pitch, and eaves overhang, then select your roofing material and set your material cost, labor cost, and waste factor. You'll get the total roofing cost broken down into material and labor, plus your roof's total area in square feet and number of roofing squares.

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Cost per 100 sq ft (1 square)

Installation cost per 100 sq ft

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Extra material for cuts and waste

Results

Total Roofing Cost

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Total Roof Area

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Roofing Squares

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Material Cost

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Labor Cost

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Frequently Asked Questions

How do I calculate my roof area?

Multiply your house length by width to get the base area, then multiply by the roof pitch factor. Add extra area for eaves overhang. A 6/12 pitch adds about 18% to the base area.

What is a roofing square?

A roofing square equals 100 square feet of roof area. This is the standard unit contractors use for pricing materials and labor. Most roofing estimates are given per square.

How much waste factor should I include?

Typically 10-15% waste factor is recommended for roofing materials. Complex roof shapes with many angles and cuts may require up to 20% waste factor to account for material loss.

What affects roofing material costs?

Material costs vary widely by type: asphalt shingles ($100-200/square), metal roofing ($300-600/square), tile ($200-500/square), and slate ($600-1000/square). Quality grade within each type also affects price.

How does roof pitch affect the project?

Steeper roof pitches increase the actual roof surface area compared to the house footprint. They also increase labor costs due to safety requirements and difficulty of installation.

What's included in labor costs?

Labor costs include tear-off of old roofing, installation of new materials, cleanup, and disposal. Steep roofs, complex shapes, and premium materials increase labor costs significantly.

When should I get professional estimates?

While online calculators provide good estimates, get professional quotes for complex roofs, historic homes, or when dealing with insurance claims. Local factors and building codes affect final costs.

How long does a typical roof replacement take?

Most residential roof replacements take 1-3 days depending on size and complexity. Weather, material type, and crew size can affect the timeline. Complex roofs may take up to a week.