How Many Boxes of Siding Do You Need?
Enter wall dimensions and coverage per box — see how many boxes and squares to buy.
Last updated: September 29, 2026
Enter Wall Details
Use wall sections (for partial re-side or different wall heights)
Walk around house, add all 4 sides. Typical 1500 sq ft house ≈ 160 ft perimeter
Standard: 8-9 ft. Two-story: 16-18 ft
Gables (optional)
Triangle area above wallWidth = wall width, Peak = from wall top to roof point
Standard door: 21 sq ft (3×7). Windows: 12-40 sq ft each
Include material cost
Order Summary
Boxes to Order
8
Based on 200 sq ft coverage per box
Siding Squares
14.06
1 square = 100 sq ft
Net Area
1278 sq ft
Waste Added
127.8 sq ft
Estimate trim, soffit, fascia, starter strips, and J-channel separately.
Worked Examples
Single-Story Ranch
160 ft perimeter · 9 ft height · 162 sq ft openings
8 boxes (14.06 squares)
Garage with Gable
24 ft wall · 9 ft height · 1 gable (5 ft peak)
2 boxes (3.04 squares)
Two-Story Side Wall
32 ft width · 18 ft height · 72 sq ft windows
4 boxes (5.76 squares)
Coverage per Box Guide
| Material | Coverage per Box | Squares per Box |
|---|---|---|
| Vinyl Siding | 200 sq ft/box | 2 squares/box |
| Fiber Cement | Varies by brand | Check packaging |
| Engineered Wood | 150-200 sq ft/box | 1.5-2 squares/box |
| Aluminum Siding | 200 sq ft/box | 2 squares/box |
Frequently Asked Questions
Enter your wall perimeter and height, subtract window/door openings, and add waste. The calculator converts your area into boxes based on coverage. Most vinyl siding boxes cover 200 sq ft (2 squares).
One square of siding is 100 sq ft. Most vinyl siding boxes hold 2 squares (200 sq ft), which is 20 to 24 panels depending on the profile. Fiber cement and specialty profiles vary, so check the label — then enter your wall area and box coverage above to get the boxes to order.
A 1,500 sq ft house typically needs 15-18 squares of siding. With 9 ft wall height and 160 ft perimeter, net area is roughly 1,400 sq ft after openings. Add 10% waste = 15.4 squares ≈ 8 boxes (at 200 sq ft/box).
10% for simple walls. 12-15% for gables, corners, or complex layouts. Waste covers off-cuts and keeps matching material for repairs.
Add gable count, width, and height. The calculator uses triangle formula: (base × height) ÷ 2 × count.
No. Trim, soffit, fascia, starter strips, and J-channel should be estimated separately after locking the siding order.