Unit Converter: Area (Square meter, Square foot)

Convert area units such as Metric system, United States customary units / Imperial units, and Japanese units of measurement to each other.
Round to the 14th decimal place.

* About the notation of "e": Numbers with many digits may be displayed as "1e9". This is a computer exponential notation, where “e” represents a power of 10.

1e3 = 10³ = 1,000

1e6 = 10⁶ = 1,000,000

1e9 = 10⁹ = 1,000,000,000

1e-3 = 10^-3 = 0.001

1e-6 = 10^-6 = 0.000001

1e-9 = 10^-9 = 0.000000001

2021-12-22

Area conversion formula

Metric system

1 km^2 = 10^2 ha = 10^4 a = 10^6 m^2

1 m^2 = 10^4 cm^2 = 10^6 mm^2

United States customary units / Imperial units

1 sq \ mi = 640 ac

1 ac = 4 ro = 4840 sq \ yd

1 sq \ yd = 9 sq \ ft

1 sq \ ft = 144 sq \ in = 929.0304 cm^2

1 sq \ in = 645.16 mm^2

Japanese units of measurement

1\text{町} = 10\text{反} = 100\text{畝} = 3000\text{坪}

1\text{坪} = {\dfrac {400}{121}} m^2 \approx 3.305785 m^2

1\text{坪} = 10\text{合} = 100\text{勺}

1\text{畳／帖} = 1.62 m^2 \ (*)

* About tatami mats (畳 / 帖 / jō)
When written as “畳”, it is not always 1.62 m². There are various dimensions of tatami mats such as Edo-ma and Kyo-ma. I made ”Unit Converter: Tatami”, so please use it.

When written as “帖”, it is 1.62 m². The “畳 / 帖” written in the recent housing advertisement is 1.62 m².

	square millimeter	mm²
	square centimeter	cm²
	square meter	m²
	are	a
	hectare	ha
	square kilometre	km²

	square foot	sq.ft.
	square yard	sq.yd.
	rood	ro
	acre	ac
	square mile	sq.mi.

	shaku	勺
	gō	合
	tsubo	坪
	se	畝
	tan	反
	chō	町