How to handle valleys and hips?

Add 10% extra material for valleys and hips. These areas require additional shingles for proper coverage and weather protection, including special valley shingles or metal flashing.

Roof Shingle Calculator

Q: How many shingles per square?

Typically 3-4 bundles per square (100 sq ft) depending on the shingle type. 3-Tab shingles usually require 3 bundles per square, while architectural shingles may need 4 bundles.

Q: What is the waste factor?

Usually 10-15% for standard roofs. Complex roofs with valleys, hips, and dormers may require 15-20% waste factor to account for cutting and installation waste.

Q: How to calculate ridge cap?

Measure the total ridge length and add 10% for waste. Ridge cap shingles are typically sold in bundles that cover 20 linear feet, so divide total length by 20 to get bundles needed.

Q: What affects shingle quantity?

Roof complexity, pitch, valleys, hips, dormers, and waste factor all affect shingle quantity. Steeper roofs require more material due to increased surface area from pitch factor.

Roof Parameters

Roof Type

Select roof style

Length

Roof length

Width

Roof width

Roof Pitch

Roof slope

Shingle Type

Select shingle style

Calculation Results

Roof Shingle Calculator: Your Guide to Roofing Materials

Need to calculate how many shingles you need for your roof? Our Roof Shingle Calculator helps you determine the exact number of shingles, underlayment, and other materials needed for your roofing project.

Understanding Roof Shingle Calculations

Roof shingle calculations are important for several reasons:

Material Planning: Accurate material estimates
Cost Control: Budget management
Waste Reduction: Minimize excess materials
Project Efficiency: Proper planning
Quality Assurance: Complete coverage

How to Use the Roof Shingle Calculator

Select Roof Type: Choose the roof style
Enter Length: Input roof length
Enter Width: Input roof width
Enter Pitch: Input roof slope
Select Shingle Type: Choose shingle style
Click Calculate: Get material estimates

Roof Shingle Calculation Formula

Roof Area:
A = L × W × Pitch Factor

Shingle Bundles:
B = (A × 1.1) ÷ 100

Underlayment Rolls:
U = (A × 1.1) ÷ 400

Where:
A = Roof area (sq ft)
L = Length
W = Width
B = Number of bundles
U = Number of underlayment rolls

Common Shingle Specifications

3-Tab Shingles:
- Coverage: 100 sq ft per bundle
- Weight: 60-80 lbs per bundle
- Warranty: 20-25 years
- Use: Standard residential
Architectural Shingles:
- Coverage: 100 sq ft per bundle
- Weight: 65-80 lbs per bundle
- Warranty: 30-50 years
- Use: Premium residential
Premium Shingles:
- Coverage: 100 sq ft per bundle
- Weight: 70-90 lbs per bundle
- Warranty: 40-50 years
- Use: High-end residential
Luxury Shingles:
- Coverage: 100 sq ft per bundle
- Weight: 80-100 lbs per bundle
- Warranty: 50+ years
- Use: Luxury homes

Real-World Examples

Example 1: Standard Gable Roof

Roof Type: Gable
Length: 40 feet
Width: 30 feet
Pitch: 30 degrees
Shingle Type: 3-Tab
Results:
- Roof Area: 1,386 sq ft
- Shingle Bundles: 16
- Underlayment Rolls: 4
- Ridge Cap: 30 linear feet
- Drip Edge: 140 linear feet

Example 2: Premium Hip Roof

Roof Type: Hip
Length: 50 feet
Width: 40 feet
Pitch: 35 degrees
Shingle Type: Architectural
Results:
- Roof Area: 2,440 sq ft
- Shingle Bundles: 27
- Underlayment Rolls: 7
- Ridge Cap: 40 linear feet
- Drip Edge: 180 linear feet

Frequently Asked Questions

How many shingles per square?

Typically 3-4 bundles per square (100 sq ft).

What is the waste factor?

Usually 10-15% for standard roofs.

How to calculate ridge cap?

Measure total ridge length plus 10% waste.

What affects shingle quantity?

Roof complexity, pitch, and waste factor.

How to handle valleys?

Add 10% extra material for valleys.