About AcresToSquareFeet.com
Reviewed against primary sources May 2026
AcresToSquareFeet.com is an independent surveyor-style land-area reference published under Digital Signet. The site exists to be a fast, exact, source-anchored answer for the question of how many square feet are in an acre, with depth on the parts that calculator aggregators flatten: the 1959 International Yard and Pound Agreement that fixed the 43,560 sq ft acre, the US Survey acre and the 4-ppm gap the NGS finally closed on October 1, 2022, the chain-and-furlong derivation that goes back to the Gunter chain of 1620, the PLSS section / township / quarter-section grid that organises 30 western US states, and the by-state norms (farm averages, ranch averages, residential lot sizes) that calculator aggregators do not carry.
Why this site exists
The trivial answer (1 acre = 43,560 sq ft) gets surfaced by every calculator aggregator and by Google's answer-snippet block. The genuinely useful answer covers the things that change the result or the context: which acre standard a document uses (international vs US Survey vs UK Imperial), why the number is 43,560 in the first place (chain x furlong = 66 ft x 660 ft = 43,560 sq ft), how the PLSS section and township grid frames western US land (640 ac = 1 sq mile = 1 section; 36 sections = 1 township = 23,040 ac; 160 ac = 1 quarter-section = the Homestead Act 1862 grant), what a typical lot or farm or ranch looks like by US state (USDA NASS averages from 2,156 ac per farm in Montana down to 59 ac in Rhode Island), and what land actually costs per acre in different agricultural regions (USDA NASS 2024 Land Values, plus state authorities for non-USDA segments like Texas rural land).
We pull each conversion factor and each land-area figure from a named, publicly verifiable primary source and cite the source on the relevant page. Where a figure is a range (such as USDA pasture cash rents from $5/ac in arid states to $45/ac in irrigated regions) we show the spread, not a single average.
Who builds this
Oliver Wakefield-Smith at Digital Signet. The site sits alongside a small set of sister reference sites covering area, kitchen measurement, language, and time units. All use the same source-anchored editorial pattern. Cross-links below.
Editorial position
The site is not affiliated with NIST, BIPM, the National Geodetic Survey, USGS, USDA NASS or NRCS, the US Bureau of Land Management, the FAA, the UK Ordnance Survey, AcreValue, LandWatch, Farm Credit, the National Association of Realtors, or any land-listing portal. Authority names appear when they are the appropriate primary source (USDA NASS for cash rent; NGS for survey-foot deprecation; BLM for PLSS conventions; the Census Bureau for residential lot data), not for paid promotion. There are no paid placements on this site and no live affiliate links today. If affiliate links are added in future to land-listing portals they will be clearly disclosed on the relevant pages.
What this site covers
Editorial principles
Source pattern
Conversion factors anchored to NIST (1959 International Yard and Pound Agreement: 1 international foot = 0.3048 m exactly; 1 international acre = 43,560 sq ft exactly = 4,046.8564224 m2), NIST Handbook 44 / SP 811, BIPM SI Brochure (metric), NGS (US Survey foot deprecation effective October 1, 2022), and the UK Weights and Measures Act 1985. Land-use data from USGS, USDA NASS, USDA NRCS, BLM (PLSS sections and townships), FAA airport-acre conventions, US Census Bureau residential lot data, and the UK Ordnance Survey.
International vs US Survey acre disclosure
The 4-ppm difference between the international acre (43,560 sq ft exactly) and the US Survey acre (about 43,560.174 sq ft) matters only for federal land records and surveys pre-October 2022. We disclose the distinction wherever it applies and we use the international acre as the modern legal standard. The site offers a US Survey foot toggle on the converter for users working with historical land descriptions.
No fabricated land-area figures
Every per-acreage equivalent is computed against the exact 1959 IYPA constant. State-level farmland prices are pulled from USDA NASS Land Values 2024 and equivalent state authorities (Texas Real Estate Research Center, Montana REIC). Where a state figure is a range we publish the range rather than picking a point. Real-world landmark sizes (Central Park 843 ac, Vatican City 109 ac, average Walmart Supercenter 4.7 ac) are verified against operator and government data.
Monthly review cadence
The site is reviewed against primary sources monthly. Every freshness indicator on the site (footer date, hero badge, JSON-LD dateModified) is driven by a single LAST_VERIFIED_DATE constant so dates do not drift apart. USDA Crop Production Summary refreshes annually (January release); USDA Land Values refreshes mid-year. Out-of-cycle refresh on NIST, BIPM, NGS, or BLM revisions.
No paid placements
Authority names (NIST, USGS, USDA NASS, USDA NRCS, BLM, NGS, FAA, the UK Ordnance Survey) appear because they are the appropriate primary source for land-area reference, not for paid promotion. Listing platforms (AcreValue, LandWatch, Farm Credit) are cited where their data underpins a published average. The site is not affiliated with any land-listing portal, USDA, NIST, the BLM, the NGS, the OS, or any government agency.
Conservative precision claims
1 international acre = 4,046.8564224 m2 is the exact figure (NIST-derived). We round to 4,046.86 m2 in body text but use the full precision in the conversion math. The 0.4047 ha-per-acre display follows the same pattern (full precision 0.40468564224 used in computation). Acreage figures from third parties (USDA, Census, Ordnance Survey) are quoted at the precision the source publishes, not rounded for tidiness.
Methodology in brief
For the full source list, calculation framework, refresh cadence, and limitations, see the dedicated methodology page. In short: conversion factors anchor to NIST (1959 IYPA), BIPM (SI), and the UK Weights and Measures Act 1985. Land-use data anchors to USDA NASS (yield, cash rent, farmland value), USDA NRCS (soil and farmland classification), BLM (PLSS), USGS (land area), and FAA (airport-acre). Historical surveyor context comes from the National Geodetic Survey and the 1959 IYPA. The chain-and-furlong derivation traces to the Gunter chain (1620).
Disclosures, contact, and corrections
- No paid placements on this site.
- No live affiliate links today. Any future affiliate links to land-listing portals will be disclosed inline on the relevant pages.
- This site is reference and educational. It is not a property survey. For legal land descriptions, deed disputes, and boundary work, retain a licensed land surveyor in your state.
- This site is not real-estate advice. Land valuation for purchase, sale, financing, or tax assessment should come from a licensed appraiser or your local assessor.
For corrections, source disagreements, or factual challenges, email us via the contact form at digitalsignet.com. We aim to respond within 5 business days. Please cite the page URL and the specific figure you are challenging, with a counter-source where possible.