Roofing Calculator – Shingles, Squares & Cost
Estimate roofing materials from roof dimensions and pitch — total area, roofing squares, shingle bundles with waste, and cost. Free, no signup.
Tool Interface
Roof measurements
Materials needed
How to use
- Measure your roof in feet and enter the length and width.
- Select your roof pitch (steeper roofs need more material — check a roof diagram if unsure).
- Pick a waste allowance (15% is a good default for cuts and starter strips).
- Optionally add your price per square to estimate the total material cost.
- Click Calculate roofing — you get the roof area, number of squares, shingle bundles and estimated cost.
Rate this tool
About This Tool
Introduction
Ordering shingles without a solid estimate means either stalling the job or overbuying pallets of material. Trencada's free Roofing Calculator turns your roof's length, width and pitch into a complete material estimate: total roof area, roofing squares, bundles of shingles (with waste allowance built in), and a cost estimate if you know your price per square. Runs 100% in your browser — free, no signup.
How to Use
- Enter your roof's length and width in feet.
- Select your roof pitch — steeper roofs need more material (6/12 is a common default).
- Pick a waste allowance (15% covers cuts and starter strips on typical roofs).
- Optionally add your price per square to estimate material cost.
- Click Calculate roofing — you get roof area, squares, bundle count and the cost estimate instantly.
Key Features
- Roof pitch multiplier presets from Flat to 12/12
- Roofing squares (100 sq ft units) and total roof area
- Shingle bundle count at 3 bundles per square, rounded up
- Adjustable waste allowance (10%, 15%, 20%)
- Optional cost estimate from your price per square
Why Choose Trencada
Free forever, no account, no limits. The calculator runs 100% in your browser — your measurements never leave your device. Instant results with no signup or downloads.
Frequently Asked Questions (FAQ)
- What is a roofing square? One roofing square equals 100 square feet of roof area — the standard unit for shingle pricing and ordering.
- How many bundles are in a square? Three bundles of standard architectural shingles cover one square (each bundle covers about 33.3 sq ft).
- How do I find my roof pitch? Pitch is the rise over a 12-inch run (e.g. 6/12). If unsure, pick the closest common value or check a roof diagram.
- Is this estimate final? No — it covers simple gable/hip roofs. Complex roofs, valleys, dormers and labor need a contractor's quote; this gives you a reliable material starting point.