Vinyl Siding Calculator
Calculate boxes of vinyl siding and cost from your wall dimensions. A box covers about 2 squares (200 sq ft); add 10% for trim and cutting waste.
How this calculator works
Vinyl siding is sold by the box, and a box of common double-4 profile covers about 200 square feet (2 squares). The calculator divides your wall area by that coverage and rounds up to whole boxes.
Formula: Boxes = wall area (sq ft) ÷ 200 sq ft per box, rounded up.
Worked example
A wall section 40 ft long × 10 ft high (400 sq ft):
- Boxes: 400 ÷ 200 = 2 boxes
- At $180/box, that’s $360.00 before waste and accessories.
Coverage reference
| Wall area | Boxes (200 sq ft each) |
|---|---|
| 400 sq ft | 2 boxes |
| 1,000 sq ft | 5 boxes |
| 2,000 sq ft | 10 boxes |
How to measure
Measure each wall’s length and height, add gable triangles, and subtract big openings. Add 10–15% for waste, and price accessories separately. For an installed budget including labor, use the Vinyl Siding Cost Calculator.
Frequently asked questions
How many boxes of vinyl siding do I need?
A box of standard double-4 vinyl siding covers about 2 squares, or 200 square feet of wall. Divide your total wall area by 200 and round up. The calculator does this and adds a waste allowance when you check the toggle.
How do I measure wall area for siding?
Multiply each wall's length by its height and add them together. Include gable triangles (½ × base × height), and subtract large openings like garage doors. Enter the total as length × height here, or run the calculator once per wall.
How much waste should I add?
10% is standard for a simple facade; add 15% for a house with many windows, corners, or gables, where more pieces get cut and discarded.
Does this include trim and accessories?
No — this counts the siding panels only. J-channel, corner posts, starter strip, and house wrap are separate. Budget another 10–20% of the panel cost for accessories on a typical job.
Estimates only. Verify quantities with your supplier before purchasing.