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Area

Size of a 2-D surface. SI base: square metre (m²).

所有Area单位（9）

square metre
m²
SI base unit of area.
square kilometre
km²
100 hectares or 1,000,000 m². Country/city size.
square centimetre
cm²
Small surfaces, cross-sections.
hectare
ha
100 m × 100 m. Standard farm and forest area unit.
square foot
ft²
US floor area, real estate.
square inch
in²
US small surface area.
square mile
mi²
640 acres. US county/area units.
acre
ac
4,047 m². US farmland and lot size.
square yard
yd²
9 ft². Carpet and fabric sales.

热门Area换算

square meter → square kilometer square meter → square centimeter square meter → hectare square meter → square foot square meter → square inch square meter → square mile square meter → acre square kilometer → square meter square kilometer → square centimeter square kilometer → hectare square kilometer → square foot square kilometer → square inch square kilometer → square mile square kilometer → acre square centimeter → square meter square centimeter → square kilometer square centimeter → hectare square centimeter → square foot square centimeter → square inch square centimeter → square mile square centimeter → acre hectare → square meter hectare → square kilometer hectare → square centimeter hectare → square foot hectare → square inch hectare → square mile hectare → acre square foot → square meter square foot → square kilometer square foot → square centimeter square foot → hectare square foot → square inch square foot → square mile square foot → acre square inch → square meter square inch → square kilometer square inch → square centimeter square inch → hectare square inch → square foot square inch → square mile square inch → acre square mile → square meter square mile → square kilometer square mile → square centimeter square mile → hectare square mile → square foot square mile → square inch square mile → acre acre → square meter acre → square kilometer acre → square centimeter acre → hectare acre → square foot acre → square inch acre → square mile

Frequently Asked Questions

What is the SI base unit of area?

The SI base area unit is m². Most conversions factor through it, except temperature which is affine and fuel-economy which is reciprocal.

Which unit systems are represented?

Area includes both metric and imperial units (where they exist in this category). For mass and length, both metric (kg, m) and US customary (lb, ft) are listed. For temperature, the three most-common scales (Celsius, Fahrenheit, Kelvin) plus Rankine and Réaumur.

How accurate are these conversions?

Conversions use the standard SI factors (NIST values where applicable). Where two slightly different definitions exist (e.g. KB vs KiB, US vs UK gallon), they are listed as separate units rather than auto-rounded.

其他分类

#1
Length

Distance, height, width — anything that measures how long something is. SI base unit: the metre (m).

 #2
Mass

How much matter is in something. Differs from weight (which is force). SI base: kilogram (kg).

 #3
Temperature

How hot or cold something is. Conversions are affine — there is an offset, not just a multiplier.

 #4
Volume

Space occupied by a 3-D object. SI base: litre (L) for everyday use; cubic metre (m³) for SI.

 #5
Speed

Distance per unit time. SI: metre per second (m/s).

 #6
Time

Duration. SI base: the second (s).

 #7
Data

Digital information size. SI: the byte (B). Note the difference between decimal (KB=1000) and binary…

 #8
Energy

Capacity to do work. SI base: joule (J). Also commonly expressed as calories, kWh, BTU.

 #9
Pressure

Force per unit area. SI base: pascal (Pa).

 #10
Angle

Rotation or turning. SI base: radian (rad).

 #11
Fuel Economy

Distance per unit of fuel, or its reciprocal (fuel per distance). Base: litres per 100 km.