How many bundles make a square?

Many shingle lines package about 3 bundles per square (≈33.3 sq ft per bundle). Always confirm on the manufacturer wrapper.

What roll sizes are common for membranes?

Common options are about 10′×100′ (≈1,000 sq ft) and 5′×100′ (≈500 sq ft). The tool rounds up rolls after waste.

Roof Material Calculator

Q: Why do you ask for roof area instead of length × width?

Area-first avoids footprint mistakes and works across materials. If you don’t know your sloped area yet, use our Roof Measurement Master Toolkit.

Q: What is a roofing square?

One square equals 100 square feet of roof surface. The calculator also reports total squares for simpler ordering.

Calculate the exact amount of shingles, TPO, PVC, EPDM, metal panels, or tiles needed for your roofing project. Get instant, accurate estimates with waste percentage included.

Instant Results Professional Grade Free to Use All Materials

Why Use Our Calculator?

Professional-grade calculations for all roofing materials.

Accurate Calculations

Industry-standard formulas ensure you order the right amount of materials every time.

Waste Included

Adjust waste percentage based on roof complexity. Never run short on materials.

All Materials

Supports shingles, TPO, PVC, EPDM, metal panels, and tile calculations.

Roof Inputs

We only ask for area so you avoid footprint mistakes.

Don’t know your roof area? Or your roof isn’t flat?

Use Our Free Calculator Toolkit →

Roof Area

Provide the sloped surface area you plan to cover.

Unit

Waste Percentage: 10%

Adjust waste for cuts, laps, and overages.

Most residential shingles are ≈3 bundles per square (≈33.3 sq ft/bundle).

Show Advanced Inputs

Coverage per Bundles (sq ft)

Override default coverage to match the exact product you’ll order.

Your Results

Material quantities with waste included

Bundles

(Rounded up for discrete units)

Bundle coverage

33.33 sq ft/bundle

Squares

Final area (sqft)

2,200 sqft

Waste applied

10%

Order 67 bundless (≈ 22 squares, 2,200 sqft with 10% waste).

Want to Know How Much This Costs?

Get instant pricing estimates with our comprehensive roofing calculator builder

Use Our Roofing Calculator Builder →

Roofing contractors: Get the complete calculator code with lead capture form — absolutely free!

Frequently Asked Questions

Common questions about roofing material calculations

Why do you ask for roof area instead of length × width?

What is a roofing square?

How many shingle bundles make a square?

How do membrane rolls (TPO / PVC / EPDM) convert from area?

Can you estimate metal panel counts?

Can you estimate tile piece counts?

What waste percentage should I use?

Is this calculator for low-slope roofs too?

Why do results round up?

Material Insights & Best Practices

Essential information to help you choose the right roofing material

Durability

Metal: 40–70 years
Tile: 50–100 years
Shingles: 15–30 years
TPO/PVC: 20–30 years
EPDM: 25–30 years

Weather Resistance

Best for rain: Metal, TPO
Best for snow: Metal (sheds snow)
Best for wind: Metal
Best for hail: Metal, slate
Hurricane zones: Metal, impact-rated shingles

Climate Suitability

Hot climates: Tile, metal (reflective)
Cold climates: Metal, EPDM
Humid climates: Metal, PVC
Desert: Tile, metal
Coastal: Metal (aluminum), PVC

Sustainability

Most recyclable: Metal (100%)
Best insulation: TPO, PVC
Cool roof: White TPO/PVC, metal
Lowest carbon: Clay tile, metal
Energy efficient: Reflective coatings

Installation Difficulty & Maintenance

Shingles

Difficulty: Easy to moderate | Maintenance: Replace damaged shingles annually, check flashings

TPO/PVC/EPDM

Difficulty: Moderate (requires heat welding) | Maintenance: Inspect seams bi-annually, clean debris

Metal

Difficulty: Moderate to difficult | Maintenance: Minimal—inspect fasteners, touch up scratches

Tile

Difficulty: Difficult (heavy, requires expertise) | Maintenance: Replace broken tiles, clean moss

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