About this tool
Why use this tool
Americans use square feet for houses, acres for land, and increasingly square meters for scientific and international contexts. Converting matters for buying property abroad, comparing US listings with European ones on international sites (Zillow vs Rightmove), understanding farm/ranch sizes, and reading construction blueprints. NIST defines all official area conversions; the US survey acre differs slightly from the international acre by 4 ppm — usually ignored outside land surveying.
How it works
1 sq ft = 0.0929 m². 1 m² = 10.7639 sq ft. 1 acre = 43,560 sq ft = 4,046.86 m² = 0.4047 hectare. 1 hectare = 10,000 m² = 2.471 acres. 1 sq mile = 640 acres = 2.59 km². 1 sq yard = 9 sq ft = 0.836 m². Standard US home sizes are quoted in gross square footage per ANSI Z765 measurement standard.
Real example
A 2,000 sq ft American home = 186 m². A one-acre suburban lot = 4,047 m² or about 0.4 hectare. A quarter-section farm (160 acres) = 65 hectares = 0.65 km². A high school football field (goal-to-goal 100 yards × 53.3 yards) covers 5,333 sq yards = 0.55 acre. A large ranch in Texas at 10,000 acres = 15.6 sq miles = 40.5 sq km.
Practical tips
Quick math: multiply m² by 10 for a rough sq ft estimate (7 % error). Real estate context: ANSI Z765 sets US measurement rules (interior finished area only, walls-in method); Fannie Mae/Freddie Mac require appraisers to follow it. For land, an acre is roughly a football field (which is 1.32 acres actually). Always request a surveyor's plat for land purchases — county recorder's office holds records. For international buyers of US real estate: 1 square meter ≈ 10.76 sq ft, so a "100 m² apartment" in Europe is about 1,076 sq ft — much smaller than typical US homes averaging 2,300 sq ft (US Census).
Disclaimer
Conversions here follow NIST's exact ratios. For real-estate transactions, only a licensed surveyor's measurement per state law has legal weight. Discrepancies between advertised and actual square footage have led to lawsuits — verify per ANSI Z765 or state-specific standards. This tool is for general reference only.