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Free Roofing Calculator - Material Estimation Made Easy

Calculate roofing materials needed including shingles, squares, and underlayment. Estimate costs and quantities for roof replacement or new construction.

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Calculate Roofing

Quick Answer

One roofing square = 100 sq ft. Standard shingles: 3 bundles per square. Multiply footprint by pitch factor for actual roof area.

Key Facts about Roofing Calculator:

  • 1 square = 100 square feet
  • 3 bundles per square (standard)
  • Add 10-15% for waste/cuts
  • Pitch affects total area
  • 6/12 pitch multiplier: 1.118

Why Use Our Roofing Calculator?

Complete roofing calculations:

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Square Calculator

Calculate roofing squares.

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Bundles

Shingle bundle count.

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Pitch Adjustment

Factor in roof pitch.

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Cost Estimate

Material costs.

Instant Results

Get estimates immediately.

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100% Private

Your data stays private.

How to Roofing Calculator in 3 Easy Steps

Calculate roofing:

1

Enter Dimensions

Roof footprint size.

2

Enter Pitch

Roof slope.

3

Get Materials

See squares and bundles.

Order Accurately

Accurate estimates

Factor in pitch

Include waste factor

Budget planning

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Right Materials
Professional estimates

Common Use Cases for Roofing Calculator

Perfect for:

Re-roofing

Plan replacement.

Calculate Materials

New Build

Estimate new roof.

Estimate Project

Budgeting

Cost planning.

Plan Budget

Frequently Asked Questions

Everything you need to know about our roofing calculator

What is a roofing square?

1 square = 100 square feet of roof area

A roofing square is 100 square feet. A 2,000 sq ft roof is 20 squares. Materials are typically sold by the square for easy estimation.

How many bundles of shingles per square?

3 bundles per square (standard), 4-5 for architectural

Typically 3 bundles per square for standard shingles. Some architectural shingles require 4-5 bundles per square. Always check manufacturer specifications.

How do I calculate roof area with pitch?

Footprint × pitch factor (6/12 pitch = multiply by 1.118)

Multiply footprint by pitch factor. Common factors: 4/12 pitch = 1.054, 6/12 = 1.118, 8/12 = 1.202, 12/12 = 1.414. A 1500 sq ft footprint at 6/12 pitch = 1677 sq ft roof.

Still have questions? Try the tool yourself!

Calculate Roofing

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