Shingles Calculator

Calculate how many shingles you need for your roofing project with industry-standard squares and bundles.

Part of the Roofing & Structure calculators — see all tools in this category.

Roof Area
sq ft

Total surface area of your roof

%

Recommended: 10% minimum (5-15% typical)

Ridge Cap (Optional)
ft

Linear feet of main ridge

ft

Linear feet of hip ridges

Ridge cap covers 33 linear feet per bundle

Advanced Options

3 for standard shingles, 4 for premium

Cost Estimate (Optional)
$

Enter price to estimate total cost

Results

Total Bundles
66

Field shingles + ridge cap (10% waste)

Field Bundles
66

22.0 squares × 3 bundles

Ridge Cap Bundles
0

No ridge cap needed

Roof Squares
22.0

20.0 squares (2000 sq ft) + 10% waste

Frequently Asked Questions

Related Calculators

Ridge Cap Calculator
Calculate ridge and hip cap shingle bundles
Roof Underlayment Calculator
Calculate underlayment rolls needed under shingles
Roof Area Calculator
Calculate roof area from dimensions and pitch

How It Works

  1. 1. Calculate Roof Area

    Measure the surface area of your roof in square feet. For simple roofs, multiply length by width for each plane. For complex roofs, break into sections and add them together. Remember to measure the actual roof surface, not the house footprint—slope adds area.

  2. 2. Convert to Squares

    The calculator converts your roof area to “squares” (100 sq ft units), the standard measurement in the roofing industry. A 2,000 sq ft roof = 20 squares. Suppliers price and sell materials based on squares, so knowing this number helps when comparing quotes.

  3. 3. Apply Waste Factor

    A 10% waste factor is added to account for cuts, edge trimming, and damaged shingles. Simple roofs may use less (5-7%), while complex roofs with valleys and dormers need more (12-15%). This ensures you have enough material to complete the job without delays.

  4. 4. Calculate Bundles

    The calculator multiplies squares (with waste) by bundles per square (3 for standard shingles, 4 for premium). Result shows field bundles needed. If you have ridges or hips, it also calculates separate ridge cap bundles based on linear feet of coverage.

  5. 5. Add Ridge Cap

    Ridge cap covers the peak of your roof and any hip ridges. Measure linear feet of ridges and hips. One bundle of ridge cap covers approximately 33 linear feet. The calculator adds these to your field bundles for the total order quantity.

Why Waste Factor Matters

Roofing waste accounts for edge trimming, valley cuts, starter course, and a few damaged shingles during installation. Running short mid-project means delays and potential color mismatches if you buy from a different lot. A 10% waste factor is industry standard and prevents these costly interruptions. For DIY projects, err on the higher side—unopened bundles are usually returnable.

More Roofing & Structure Calculators

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Roof Area Calculator

Calculate true roof surface area from footprint dimensions, accounting for roof pitch, overhangs, and common roof shapes.

Gutter & Downspout Calculator

Calculate gutter sections, downspouts, elbows, and end caps from roof perimeter, corners, and building height.

Roof Underlayment Calculator

Calculate rolls of synthetic underlayment or roofing felt needed from roof area with overlap factor applied.

Ridge Cap Calculator

Calculate ridge cap and hip cap shingle pieces and bundles from ridge and hip lengths.

Related Guides

Roofing & Exterior Guide

Shingles, gutters, siding, and exterior envelope material planning.

Complete Estimation Guide

Site-wide guide to measurement workflows and estimation best practices.

Shingles Calculator - How Many Shingles Do I Need | ConstructCalculators