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The site area in square feet.
An acre is 43,560 square feet — a figure inherited from medieval land measure rather than from any decimal system.
Site area
1 acre
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
They open the calculator with your figures already in it
Square Feet to Acres Calculator: 1 acre — shown in imperial, US market. The link sets both, so the result they see is the one on your screen.
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How this was calculated
Formula source(s)
- 1 acre = 43,560 square feet = 4,840 square yards exactly
- 1 acre = 0.404686 hectares
Inputs used
- Site area (sq ft)
- 43560
Intermediate steps
- Conversion factor applied
- 0 acres per sq ft
Confidence note: 1 acre = 43,560 sq ft exactly, by definition. Gross acreage is not buildable area — setbacks, easements and access all reduce it.
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.
Computed in your browser — nothing you enter is uploaded. 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.
Sources checked 2026-08-26 · in the site-wide review of 2026-09-06 · v1.0.0
Regulatory standards & verification citations2
- 1 acre = 43,560 square feet = 4,840 square yards exactly
- 1 acre = 0.404686 hectares
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Your workspace
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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.