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Square Feet to Acres Calculator

Convert a site area from square feet to acres for plot descriptions and planning documents.

Computed in your browser — nothing you enter is uploaded. Figures are presented for United States against IRC 2024, and every formula is cited under regulatory standards below.

Last verified 2026-08-26 · v1.0.0

Market
Imperial · sales tax

Site area

1 acres

High confidence

1 acre = 43,560 sq ft exactly, by definition. Gross acreage is not buildable area — setbacks, easements and access all reduce it.

Conversion factor applied
0 acres per sq ft

Land is described in acres and measured in feet, so plot descriptions and site surveys meet here. The conversion is exact, and the number to know is 43,560 — an inheritance from medieval ploughing rather than anything systematic. The practical caution concerns what acreage means: a stated site area is gross, and the developable portion is invariably smaller once setbacks, easements, access provision, drainage and any ground that cannot carry building are taken out. Converting a site's square footage into acres for a planning conversation is straightforward; treating that acreage as the area available to build on is where the number gets misused.

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 — confirmed fixes become pinned regression tests.

[Schema Verified] Computed in alignment with American Concrete Institute (ACI 318-19) formulas and International Residential Code (IRC 2024) spatial boundaries.

Regulatory standards & verification citations

  • 1 acre = 43,560 square feet = 4,840 square yards exactly
  • 1 acre = 0.404686 hectares

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

Why 43,560 square feet?
It descends from the medieval acre, notionally the land one team could plough in a day — a furlong long by a chain wide. The number is an inheritance rather than a design, which is why it looks arbitrary next to metric land units.
Is a plot's acreage the buildable area?
Rarely. Setbacks, easements, access, drainage and any unbuildable ground all reduce it. Gross site area is a starting point for planning discussions, not a measure of what can be developed.
How big is an acre in familiar terms?
Roughly 208 feet square, or a little smaller than an American football field including the end zones. Both are useful for sanity-checking a plot description against what you can see on the ground.