Shingle Calculator

Calculate exactly how many shingles, bundles, and squares you need for your roof

Get a fast estimate from your roof square footage

Quick presets

sq ft

You Need

60 bundles

17.9 squares • 1,792 sq ft roof area

Estimated Cost Range

$1,971 – $2,956
PRO

Professional Calculator

Complete bill of materials with all accessories and waste calculations

sq ft

Total Materials Cost

$3,607

Shingle Bundles

66

Roof Area

1,973 sq ft

Roofing Squares

19.7

Cost Breakdown

Shingles: $2,750 (76%)
Underlayment: $135 (4%)
Ice & Water: $440 (12%)
Trim & Flashing: $217 (6%)
Fasteners & Starter: $65 (2%)

Detailed Breakdown

Shingle Bundles66 bundles (architectural)
Coverage2,170 sq ft incl. 10% waste
Underlayment3 rolls (synthetic)
Ice & Water Shield8 rolls (2 rows)
Drip Edge22 pieces (10 ft each)
Ridge Cap2 bundles (50 ft)
Starter Strip1 rolls (100 ft eave)
Flashing4 pieces
Chimney4 pieces
Skylight0 pieces
Valley0 pieces (0 ft)
Roofing Nails1 boxes (~7,200 nails)
Total Material Cost$3,607
How to Use This Calculator
Using the Shingle Calculator is straightforward:

Quick Estimate tab: Enter your total roof area in square feet and select a waste factor. The calculator instantly shows how many bundles and squares of shingles you need, along with an estimated cost range.

Detailed Takeoff tab: Enter your roof's length and width, select the pitch, and choose your shingle type. The calculator computes the true roof area (adjusted for slope), then provides a complete material list including bundles, underlayment rolls, drip edge pieces, ridge cap, starter strip, and nails.

Budget Planner tab: Enter your roof area, shingle type, and state. The calculator estimates your total project cost broken down by materials, labor, tear-off, and disposal — customized for your state's pricing.

If you don't know your roof pitch, use our Roof Pitch Calculator. If you don't know your roof area, use our Roof Area Calculator.

The Formula
The shingle calculation uses these formulas:

Roof Area = Length × Width × Pitch Multiplier For a 50 × 34 ft roof at 4/12 pitch: 50 × 34 × 1.054 = 1,792 sq ft

Roofing Squares = Roof Area ÷ 100 1,792 ÷ 100 = 17.92 squares

Bundles Needed = Squares × 3 × (1 + Waste%) 17.92 × 3 × 1.10 = 59.1 → 60 bundles

Underlayment Rolls = Roof Area ÷ Roll Coverage (typically 400 sq ft for 15lb felt) 1,792 ÷ 400 = 4.48 → 5 rolls

Drip Edge Pieces = Roof Perimeter ÷ 10 ft (standard piece length) (50 + 50 + 34 + 34) ÷ 10 = 16.8 → 17 pieces (plus waste)
Example Calculation
Example: Average Home in Texas

Sarah has a 1,700 sq ft ranch-style home in Austin, TX with a simple gable roof at 5/12 pitch.

Step 1: Calculate true roof area 1,700 sq ft × 1.083 (5/12 pitch multiplier) = 1,841 sq ft

Step 2: Calculate materials
• Squares: 1,841 ÷ 100 = 18.4 squares
• Bundles (with 10% waste): 18.4 × 3 × 1.10 = 60.7 → 61 bundles
• Underlayment: 1,841 ÷ 400 = 4.6 → 5 rolls of 15lb felt
• Drip edge: ~168 ft perimeter ÷ 10 = 17 pieces
• Ridge cap: 50 ft ridge ÷ 25 cap shingles per bundle = 2 bundles
• Starter strip: 100 ft eave × 2 sides = 3 rolls
• Nails: 18.4 squares × 320 nails = 5,888 nails (~2 boxes)

Step 3: Estimate cost
• Architectural shingles: 61 bundles × $35 = $2,135
• Underlayment + accessories: ~$450
• Materials total: ~$2,585
• Labor (Texas average): 18.4 sq × $350 = $6,440
• Tear-off + disposal: ~$1,200
• Total project estimate: $10,225

Frequently Asked Questions

How many bundles of shingles do I need per square?
You need 3 bundles of standard shingles per roofing square. A roofing square is 100 square feet of roof area. So for a 1,700 sq ft roof, you need 17 squares × 3 = 51 bundles, plus 10-15% extra for waste.
How many square feet does a bundle of shingles cover?
A standard bundle of asphalt shingles covers approximately 33.3 square feet. Three bundles cover one roofing square (100 sq ft). Some premium and architectural shingles may require 4-5 bundles per square — always check the manufacturer's specifications.
How much waste should I add to my shingle calculation?
Add 10% waste for a simple gable roof, 12-15% for a hip roof, and 15-20% for complex roofs with multiple valleys, dormers, or skylights. The waste accounts for cuts around vents, pipes, edges, and ridge caps.
How do I calculate roof area from house square footage?
Multiply your home's footprint (ground floor area) by the roof pitch multiplier. For example, a 1,500 sq ft footprint with a 4/12 pitch: 1,500 × 1.054 = 1,581 sq ft of roof area. Add eave overhangs (typically 1-2 ft on each side) for the true total.
What is the cheapest type of roofing shingle?
3-tab asphalt shingles are the most affordable at $70-100 per square (100 sq ft) for materials. Architectural shingles cost $100-150 per square but last 25-30 years vs 15-20 years for 3-tab, making them a better value per year of life.

Related Calculators

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Roofing Material Calculator

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