Siding calculator
Estimate siding squares, net wall area, gables, openings, known area, waste, trim allowance, material range, labor range, and contractor total.
Home Project Estimates
Siding calculator
May 15, 2026
160 linear ft perimeter with 9 ft walls.
Shopping list
- vinyl siding13.9 squares
- Housewrap, starter strips, corners, trim, fastenersAllowance included
- Caulk and flashing tapeAs needed
Assumptions
- Siding square is 100 sq ft
- 10% waste buffer
- Openings are deducted as one total area input
- U.S. near average; pricing data: U.S. near average pricing
Planning estimate only. Not a contractor quote, engineering advice, or permit review.
Calculator setup
160 linear ft perimeter with 9 ft walls.
Shopping list
- vinyl siding13.9 squares
- Housewrap, starter strips, corners, trim, fastenersAllowance included
- Caulk and flashing tapeAs needed
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Shared links include the current inputs and unit setting. Saved estimates stay local unless you enable Google Drive sync.
Assumptions in this estimate
- Siding square is 100 sq ft
- 10% waste buffer
- Openings are deducted as one total area input
- U.S. near average; pricing data: U.S. near average pricing
No saved estimates yet.
What this calculator estimates
This siding calculator starts from the measurements and options you enter, then estimates material quantity, waste, cost ranges, labor ranges, and a starter shopping list.
Results adapt to the selected region and unit settings, so the estimate is not locked to one market or measurement system.
Report confusing results, missing options, or assumptions that look off.
How this is calculated
- Perimeter mode calculates gross wall area as perimeter x average wall height.
- Walls + gables mode adds rectangular wall groups and triangular gable areas.
- Window and door area is deducted from perimeter and wall-by-wall modes as one total opening input.
- Known area mode starts from net siding square footage after openings are already deducted.
- Siding squares divide order area by 100 sq ft after waste is added.
Assumption register
| Item | Low | Typical | High | Source |
|---|---|---|---|---|
| Siding square | 100 | 100 | 100 | Homewyse vinyl siding cost calculator Checked 2026-06-21 · high confidence |
| Starter waste | 7 | 10 | 15 | Homewyse vinyl siding cost calculator Checked 2026-06-21 · medium confidence |
| Installed siding range | 6.5 | 10.5 | 19 | Homewyse vinyl siding installed benchmark Checked 2026-06-21 · low confidence |
Last reviewed: May 15, 2026. These values are planning defaults, not live prices.
Common mistakes
- Forgetting gables, dormers, corners, trim, and wall jogs.
- Treating siding material cost as the full installed cost.
- Skipping sheathing, water-resistive barrier, and flashing repair allowances.
FAQ
What is a siding square?
A siding square is 100 sq ft of siding area.
When should you use walls + gables mode?
Use it when gable triangles, uneven wall lengths, additions, or partial elevations make a perimeter average too rough.
Should openings be deducted?
For planning, deduct a rough combined area for windows and doors, then keep waste conservative.
When should you use known area?
Use known area when plans, a quote, or a takeoff tool already gives you net siding square footage.
Does this include removal?
No. Existing siding removal and disposal should be priced separately.
Can this siding calculator estimate cost by region?
Yes. The calculator uses the selected region and unit settings to adapt quantities, cost ranges, labor ranges, and assumptions.
How should you use the result before buying materials?
Use the result as a planning estimate, then compare it with a current supplier cart, contractor quote, or local project conditions before committing.
Limitations
This calculator uses simplified wall geometry. Gables are treated as triangles, wall groups are rectangles, and dormers, multi-story access, trim packages, sheathing repair, and removal scope can change real quotes.
This estimate is for planning only. It is not a contractor quote, engineering advice, or permit review.
Next step
Measure once more, compare the result with a real quote or shopping cart, and review the assumptions before buying materials.
Read the how much siding do I need guide
Read the how many siding squares do I need guide
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