Area Converters
Pick a family to convert between metric and US/imperial area units using exact international definitions.
Scope & Verification
This hub groups related converter families so you can move from the category level to exact routes with one clear basis per page.
- Families are split so exact-factor, profile-based, density-based, and estimate-style pages do not collapse into one generic answer.
- Leaf pages keep calculator, common values, FAQ, and reverse routes aligned to the same assumption.
- Methodology and verification pages document how those assumptions are chosen and checked.
Public interfaces
Machine access
Conversions in this hub are represented by the canonical area family and its registered source and target units.
Its 18 published directions use the same canonical engine through the website, JSON API, OpenAPI and WebMCP.
API & Agent documentationExplanation
Area conversions in this hub use exact fixed relationships: 1 acre = 43,560 ft², 1 hectare = 10,000 m², 1 mi² = 640 acres, and 1 km² = 1,000,000 m². Because area factors are purely multiplicative with no offsets, conversions are stable and reversible. For clarity, area conversions are grouped into square-length, land-area, and cross-system categories.
Questions & answers
Frequently Asked Questions
What is the SI unit of area?
The SI derived unit of area is the square meter (m²).
How many square feet are in an acre?
1 acre equals exactly 43,560 square feet.
What is the difference between an acre and a hectare?
An acre is a US/imperial land-area unit, while a hectare is a metric land-area unit equal to 10,000 m².
How many acres are in a square mile?
1 square mile equals 640 acres.
Are area conversions multiplicative?
Yes. Area conversions use fixed multiplicative factors with no offsets.
How do I switch direction?
Use the switch button or open the mirror family to load the reverse conversion page.