Single-material calculator
Siding Calculator
Exterior siding takeoff with vinyl, fiber-cement, or wood cladding, openings, gable area, house wrap, and corner trim built in.
2D plan
Schematic quantity basis · to scale
2D and 3D previews are drawn to scale from your inputs but remain schematic: anything you did not enter is illustrative. Drag to orbit, and scroll or pinch to zoom when 3D is open.
3D assembly
Optional 3D check
3D is optional here. Use it to sanity-check the base profile after the 2D quantity path is clear.
Input review
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Labor, permits, inspections, delivery, taxes, site prep, and site-specific engineering are not included.
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Plan details & review
Planning assumptions
5Included scope: Cladding, Weather barrier, Trim.
Planning assumptions · 5
- This calculator models one wall elevation at a time. Estimate each side of the building separately and combine the lists before ordering.
- Opening deductions use simple rectangular door and window areas and do not add back starter, head flashing, casing, channel, or trim packages around each opening.
- Cladding unit counts use nominal manufacturer coverage baselines; exposure, reveal, lap, stagger, break pattern, and damage replacement can change the real field takeoff.
- House wrap and corner trim are directional planning allowances only. This calculator does not size flashing tape, sill pans, rainscreen spacers, fastener schedules, or code-required water-management detailing.
- The BOM rounds packaged materials to whole purchase units such as gallons, bags, boxes, buckets, rolls, cartons, tubes, jars, bundles, or kits, so bought quantity can exceed the exact theoretical coverage shown by the area metrics.
Not included / Trade review
22 total scope notes to read before ordering or contractor handoff.
- Labor, permits, inspections, delivery, taxes, site prep, and site-specific engineering are not included.
- This siding calculator carries field cladding, optional house wrap, outside corner trim, starter strip, and J-channel only. Rake trim, flashing tape, fasteners, rainscreen layers, and soffit / fascia stay outside this scope.
How pricing works
Schematic exterior siding scope for a 40 ft x 10 ft wall with Vinyl lap siding, 1 door, 1 window, 2 outside corners, and no gable add-on.
Material estimate for the quantities in this plan.
- Source: Retailer price
- Price as of: 10/17/2026
- Shopping confidence: Fix the flagged items first. Some inputs need review before this list is worth buying from.
Use your estimate
Save this estimate to reopen it later, share the link or the plain-text takeoff, or export a PDF. Pin to compare stacks alternate inputs side by side.
Material list
Your build list
Each line shows a purchase quantity, a coverage amount, or a planning allowance - the line says which. Check pack sizes and your site conditions before you order.
| Material | Assembly | Unit | Qty | Unit price | Total | Store |
|---|---|---|---|---|---|---|
|
Vinyl siding cartons
Calculator default
|
cladding | carton |
3
covers 404.79 sq ft
|
$209.00Not editable: priced as a package | $627.00 | |
Quantity basis Install 367.99 + waste 36.8 = 404.79 sq ft → buy 3 carton (200 sq ft per carton).
|
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|
House wrap
Calculator default
|
weather barrier | roll |
1
|
$119.00 |
$119.00 | |
Quantity basis The visible row quantity is a purchase or ordering quantity.
|
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|
Corner trim
Calculator default
|
trim | piece |
3
|
$26.98 |
$80.94 | |
Quantity basis The visible row quantity is a purchase or ordering quantity.
|
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|
Starter strip
Calculator default
|
siding starter | piece |
4
|
$10.48 |
$41.92 | |
Quantity basis The visible row quantity is a purchase or ordering quantity.
|
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|
J-channel
Calculator default
|
siding trim | piece |
3
|
$8.98 |
$26.94 | |
Quantity basis The visible row quantity is a purchase or ordering quantity.
|
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Prices checked on the date shown; local price and stock may vary. Some links in this calculator are affiliate links. BuildListCalc may earn a commission at no extra cost to you.
Estimated materials total$895.80
Material guide
Switch between tabs to see how this calculator works and what stays outside its scope.
Common siding terms used in this estimate
Quick reference only. Manufacturer instructions and local code review still control installation details.
- Square: The siding industry area unit: 1 square = 100 sq ft of wall coverage. Vinyl cartons in this calculator cover about 2 squares each.
- Starter strip: The level strip fastened at the bottom of the wall that locks or supports the first course of siding.
- J-channel: The J-shaped vinyl trim that receives siding ends around windows, doors, and other openings on vinyl installs. Wood and fiber-cement systems use casing and flashing instead.
- House wrap: The water-resistive barrier layer between sheathing and siding that sheds water while letting the wall dry.
- Gable rise: The extra triangular wall height above the main rectangular wall on a gable-end elevation, measured from the top of the wall to the roof peak.
- Outside corner: A corner where two exterior walls meet pointing away from the house; each one gets a corner post or corner boards.
How to calculate siding
Siding is estimated by wall area. Measure each wall, subtract the openings, add waste, and convert the result into the units the product is sold in.
- Wall area. Multiply wall length by wall height. For a gable end, add the triangle: wall length times gable rise, divided by two.
- Openings. Subtract the area of each door and window.
- Waste. Add an allowance for cuts around openings and corners. The default is 10%.
- Units and trim. Divide the adjusted area by the coverage of one carton, board, or panel and round up. House wrap and trim pieces such as corner trim, starter strip, and J-channel are counted from the wall length, wall height, and openings.
Example: siding for a 40 × 10 ft wall
A wall 40 ft long and 10 ft high is 400 sq ft. One 3 ft door and one 3 × 4 ft window take out about 32 sq ft, leaving 368 sq ft. With 10% waste that is about 405 sq ft. Vinyl cartons cover 200 sq ft each, so the default plan rounds up to 3 cartons, which is 6 squares of packaged coverage.
Siding estimate questions
How many squares of siding do I need?
One square covers 100 sq ft. Take your net wall area with waste added, divide by 100, and round up to the packaging your product comes in.
How do I estimate siding for a gable end?
Treat the gable as a triangle: wall length times gable rise, divided by two. Enter the gable rise and the calculator adds that area. Rake trim and vents are not included.
How much waste should I add for siding?
About 10% is a common starting point. Walls with many openings, corners, or gables often need more, especially with wood or fiber cement.
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3 vinyl siding cartons for 368 sq ft
Estimated materials total