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Siding Calculator

Estimate the siding squares needed to cover exterior walls, minus doors and windows.

Computed in your browser — nothing you enter is uploaded. Figures are presented in United States units and terminology, and each formula’s basis is cited under regulatory standards below.

Last verified 2026-08-25 · v1.0.0

Market
Imperial · sales tax
130 ft10 ft
Schematic, drawn to the proportions you entered — not to scale on screen.
Who is doing the work?

The standard allowance most suppliers and estimating guides assume for ordinary work.

Estimated siding needed

12.51 squares

High confidence
Net wall area
1137.46 sq ft
Openings subtracted
162.54 sq ft

For the dimensions entered, expect a result of 12.5 squares. Set for United States. The market selector changes the units and the trade terminology; any standard behind the formula is cited under sources.

Estimated cost — your price

This site holds no price list for this material — local prices vary too much to publish honestly. Enter your supplier's price and the result is costed with it.

Preliminary estimate, not certified engineering. This tool produces an indicative quantity calculation for planning purposes only — it is not a certified structural analysis, a guaranteed material takeoff, or a substitute for building department approval. Always verify measurements on-site and have a licensed contractor or structural engineer review any load-bearing, code-sensitive, or safety-critical work before purchasing materials or starting construction. Spotted an arithmetic or standards error? Report it to contact@craftquantities.com with your inputs — a confirmed fix gets a permanent check of its own, so the same mistake cannot come back.

Presented in US customary units and US trade terminology. Where a formula follows a published standard, that standard and its edition are cited beside it on this page; where none governs, the page says so. Local amendments override model codes — verify against the code in force where you build.

Regulatory standards & verification citations

  • Vinyl siding is conventionally quoted in 'squares' of 100 sq ft, the same convention used for roofing

Your workspace

Most jobs need more than one number. Add the calculators you need next and they open right here, underneath this one — your figures stay on screen and nothing is lost to a page change.

Frequently asked questions

Does this include gable ends?
Only if you include their area in your average wall height/perimeter input. For accuracy, calculate triangular gable areas separately (base x height / 2) and add the equivalent square footage.
What's a 'square' in siding terms?
Same convention as roofing — 100 square feet of coverage, regardless of the physical panel size.
Does this account for house wrap or trim?
No — this estimates siding panels only. House wrap, corner posts, and trim pieces are calculated separately.