Roofing Calculator

Calculate roof area, squares, and bundles needed based on roof type, pitch, and material. Free online roofing calculator.

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About Roofing Calculator

Our Roofing Calculator estimates the total roof area and materials needed for your roofing project. Supports gable, hip, and flat roofs with adjustable pitch and waste percentage. Calculates bundles for asphalt shingles, metal, and tile roofing.

Roofing Calculator

Roof Type ?Select the shape of your roof: Gable (two slopes), Hip (slopes on all four sides), or Flat (nearly level)

Roofing Material ?Select your roofing material. Each material uses a different number of bundles per square (100 ft²)

Measurement Unit ?Choose the unit for roof dimensions. Results are always shown in square feet.

Roof Length ft ?Enter the horizontal length of the roof in feet

Roof Width ft ?Enter the horizontal width of the roof in feet

Roof Pitch ?Roof pitch is the rise over run expressed as inches per 12 inches. A 6/12 pitch rises 6 inches for every 12 inches of horizontal run

Waste Factor (%) ?Additional material to account for cuts, overlaps, and waste. 10% is typical for simple roofs; complex roofs may need 15-20%

Roof Area (ft²)

Squares

Bundles Needed

Pitch Angle

Calculation Breakdown

Roof Type --

Dimensions --

Pitch Multiplier --

Base Area --

Waste Factor --

Total Area --

Material Details

Material --

Bundles per Square --

Total Bundles --

Coverage Area --

How It's Calculated

This calculator estimates your total roofing material needs by computing the roof surface area based on your dimensions, roof type, and pitch. The pitch multiplier accounts for the additional surface area created by the roof slope. A waste factor is added to cover cuts, overlaps, and flashing.

Key Formulas

Gable Area = Length × Width × Pitch Multiplier

Hip Area = Length × Width × Pitch Multiplier × 1.06

Flat Area = Length × Width × 1.02

Squares Squares = Total Area (ft²) ÷ 100

Pitch Angle θ = arctan(pitch ÷ 12) in degrees

Pitch Multiplier Reference

PitchMultiplierAngle

2/121.029.5°

3/121.0314.0°

4/121.0518.4°

5/121.0822.6°

6/121.1226.6°

7/121.1630.3°

8/121.2033.7°

9/121.2536.9°

10/121.3039.8°

11/121.3642.5°

12/121.4145.0°

Real-Life Examples

Small Home

40 ft × 30 ft Gable at 6/12: 40 × 30 × 1.12 = 1,344 ft² → 13.4 squares → ~41 bundles of asphalt.

Medium Home

55 ft × 35 ft Hip at 8/12: 55 × 35 × 1.20 × 1.06 = 2,446 ft² → 24.5 squares → ~74 bundles.

Commercial

80 ft × 60 ft Flat at 2% slope: 80 × 60 × 1.02 = 4,896 ft² → 49.0 squares → 49 bundles of metal.

Steep Pitch

30 ft × 25 ft Gable at 12/12: 30 × 25 × 1.41 = 1,058 ft² → 10.6 squares → ~32 bundles.

Disclaimer: This calculator provides estimates for general informational purposes only. Actual material needs may vary based on roof complexity, local building codes, flashing requirements, and other factors. Always consult a professional roofer for accurate measurements and material estimates.

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Features

Security

Secure & Private

Your files are processed securely and deleted immediately after.

Speed

Fast Processing

Get your results in seconds with our optimized processing engine.

Setup

No Installation

Works entirely in your browser. No software to install.

Pricing

Free to Use

Use this tool completely free with no hidden charges.

Limit

Generous Limits

Enjoy generous file limits with no surprise caps on size or count.

Quality

High Quality Output

Results are rendered at full quality, ready for production use.

Frequently Asked Questions

Is Roofing Calculator free to use?

Yes, this tool is completely free to use. There are no hidden fees or subscription requirements.

Are my files safe and secure?

Absolutely. All file processing happens securely. Your files are automatically deleted from our servers after processing.

What file formats are supported?

This tool supports a wide range of common file formats. Check the upload area for specific format requirements.

Do I need to create an account?

No account is required. Simply upload your file, process it, and download the result.

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Roofing Calculator

About Roofing Calculator

Roofing Calculator

Calculation Breakdown

Material Details

How It's Calculated

Real-Life Examples

Warning

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Features

Secure & Private

Fast Processing

No Installation

Free to Use

Generous Limits

High Quality Output

Frequently Asked Questions

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