Roofing Calculators & Measurement Guide

Trusted by contractors and DIY homeowners | Updated February 2026

Use these roofing calculators to estimate shingle quantities, roofing squares, underlayment coverage, and ice and water shield requirements. Enter roof dimensions to calculate material needs before ordering.

Start with the roof squares calculator to convert roof area into squares before finalizing bundle and underlayment counts.

Roofing Material Coverage Reference

Material	Typical Coverage
Asphalt Shingles	~33 sq ft per bundle
Roofing Square	100 sq ft
Ice & Water Shield Roll	~200 sq ft
Roofing Felt Roll	~400 sq ft

Core Roofing Calculators

Roofing Squares Calculator

Convert roof area to roofing squares and shingle bundles.

Shingle Calculator (Squares & Bundles)

Calculate bundles needed with waste factor built in.

Roof Pitch Calculator

Measure slope, rise/run, and pitch multiplier.

Roofing Underlayment Calculator

Estimate felt or synthetic underlayment rolls.

Ridge Cap Calculator

Calculate ridge cap shingles needed.

Additional Roofing Calculators

Drip Edge Calculator

Total drip edge length with waste and stick count.

Roof Ventilation Calculator

Net free area and vent needs.

Metal Roofing Panel Calculator

Panels needed from roof area and coverage width.

Roof Sheathing Calculator

Sheets needed from roof area and sheet size.

Roofing Nail Calculator

Estimate nails and boxes from roofing squares.

Ice & Water Shield Calculator

Membrane area and roll counts for eaves and valleys.

Roofing Measurement Guides

Roofing Cost Guide (2026)

Pricing ranges by square plus the materials and labor costs that move bids.

Roof Pitch Explained

What pitch means, how to measure it, and how slope affects takeoffs.

How Many Shingles Per Square?

Bundle counts, ridge cap coverage, and waste planning tips.

How Roofing Squares Work

1 square equals 100 square feet of roof surface.

Most shingles cover about 3 bundles per square.

Pitch increases surface area, so steeper roofs require more material.

Waste is typically added at 10–15% for cuts, hips, valleys, and starters.

Roofing Calculator FAQs

How many bundles are in a roofing square?

Most asphalt shingles require 3 bundles per square.

How much roofing waste should I add?

Add 10–15% extra material depending on roof complexity.