Vinyl Siding Calculator
Determine how many "squares" of siding you'll need for your exterior renovation, accounting for openings and cutting waste.
Total Siding Squares
1 Square = 100 Square Feet
Carton Estimator
Approx. - cartons needed (2 Squares per Carton).
Handling Large Openings
In professional estimating, small windows (less than 15-20 sq ft) are rarely deducted from the gross wall area. The material saved by these openings is typically offset by the waste created during framing and trim cutting. For large garage doors or sliding glass doors, deduct the actual area.
The Weather Barrier (WRB)
Vinyl siding is not waterproof; it is designed to shed bulk water. A high-quality "House Wrap" installed in a shingle-lap fashion is your primary defense against moisture, preventing structural rot and mildew.
Siding Procurement Formula
Material Calculation
Squares = ⌈ (Area ÷ 100) × (1 + Waste%) ⌉
Standard Waste Factors
- Simple Side-Walls: 5-8%
- Complex Frontage: 10-12%
- Gable Ends: 10-15%
- Excessive Cut-outs: 15%+
Why use "Squares"?
A "Square" is the universal unit for exterior building materials (100 sq ft). It allows for simple comparison between siding, roofing shingles, and house wrap rolls.
Siding Reference (10% Waste)
Wall Area Squares Approx. Cartons 1,000 ft² 11 6 1,500 ft² 17 9 2,000 ft² 22 11 3,000 ft² 33 17 Exterior Siding FAQs