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Area Converter

Converts areas between metric (mm² to km², hectare) and US/imperial units (in², ft², yd², acre, mi²) using exact factors (1 ft² = 0.09290304 m², 1 acre = 4046.8564224 m²).

When to use

You need land, floor or surface area in another unit, e.g. square feet to square metres, acres to hectares or square miles to square kilometres.

Do not use when: You need to compute an area from dimensions (use rectangle, circle or triangle-area) or material quantities for a floor (use flooring).

Formula

result = value × factor, factor = (1 from_unit in m2) / (1 to_unit in m2)

Inputs

Parameter	Type	Required	Description
`value`	number	yes	Amount to convert, expressed in from_unit.
`from_unit`	enum: mm2 \| cm2 \| m2 \| ha \| km2 \| in2 \| ft2 \| yd2 \| acre \| mi2	yes	Unit of the input value. Accepted symbols: mm2, cm2, m2, ha, km2, in2, ft2, yd2, acre, mi2; spelled-out names and common abbreviations are accepted too.
`to_unit`	enum: mm2 \| cm2 \| m2 \| ha \| km2 \| in2 \| ft2 \| yd2 \| acre \| mi2	yes	Unit to convert into (same symbols as from_unit).

Outputs

Output	Type	Description
`result`	number	Converted value expressed in to_unit (rounded to 6 decimals; see result_text for very small or very large values).
`result_text`	string	The conversion as text with 6 significant figures, e.g. "5 mi = 8.04672 km".
`formula`	string	Relation used, e.g. "1 mi = 1.609344 km".
`factor`	number	Multiplier from from_unit to to_unit (result = value × factor); absent for non-linear conversions.
`conversion_table`	object	The input value expressed in every supported area unit (6 significant figures), keyed by unit symbol.

Example

1 acre to square feet: {"value":1,"from_unit":"acre","to_unit":"ft2"} → {"result":43560,"factor":43560,"formula":"1 acre = 43560 ft²","conversion_table":{"m2":4046.86,"ha":0.404686}}

120 m² to square feet: {"value":120,"from_unit":"m2","to_unit":"ft2"} → {"result":1291.66925,"conversion_table":{"yd2":143.519,"acre":0.0296526}}

GET https://tttkmbb.com/api/v1/calculate/area?value=1&from_unit=acre&to_unit=ft2

Machine access

API: GET https://tttkmbb.com/api/v1/calculate/area (query parameters) or POST with a JSON body {"inputs": {...}}
Schema: https://tttkmbb.com/api/v1/calculators/area · Markdown: https://tttkmbb.com/conversion/area.md · JSON definition: https://tttkmbb.com/conversion/area.json
MCP: server https://tttkmbb.com/mcp, tool run_calculator with calculator_id="area"
OpenAPI operationId: convert_area
Freshness: static. Authentication: none. Rate limit: fair use (see rate limits).

Sources

FAQ

How do I enter square units?

Use m2, ft2, km2 (or m², sq ft, square feet, sqm and similar spellings); the enum values are the ASCII forms.

Is the acre exact?

Yes: the international acre is 4046.8564224 m² (66 × 660 international feet). The US survey acre differs by about 4 parts per million and is not used here.

Related calculators

Rectangle Calculator — Compute area from side lengths first.
Flooring Calculator — Estimate flooring from a floor area.
Length Converter — Convert the underlying lengths.