Square millimetre (mm²)
The square millimetre (symbol: mm²) is an SI derived unit of area equal to one millionth of a square metre (10⁻⁶ m²). Corresponding to a square with sides of one millimetre, it is the standard unit for micro-scale spatial measurements in technical drawing, mechanical engineering, electrical wire cross-sections, and medicine. It provides precise measurements without requiring decimal fractions for very small physical components.
Metric
- Square kilometre (km²)1×10⁻¹²
- Hectare (ha)1×10⁻¹⁰
- Are (a)1×10⁻⁸
- Square metre (m²)1×10⁻⁶
- Square decimetre (dm²)1×10⁻⁴
- Square centimetre (cm²)0.01
- Square millimetre (mm²)1
- Square micrometre (µm²)1,000,000
- Square nanometre (nm²)1×10¹²
British/American
- Township1.07×10⁻¹⁴
- Square mile3.86×10⁻¹³
- Homestead1.54×10⁻¹²
- Acre2.47×10⁻¹⁰
- Rood9.88×10⁻¹⁰
- Square rod3.95×10⁻⁸
- Square1.08×10⁻⁷
- Square yard (yr²)1.2×10⁻⁶
- Square foot (ft²)1.08×10⁻⁵
- Square inch (in²)1.55×10⁻³
Other
- Metric dunam1×10⁻⁹
- Cypriot dunam7.47×10⁻¹⁰
- Iraqi dunam4×10⁻¹⁰
- Football pitch1.4×10⁻¹⁰
Brazilian
- Alqueire paulista4.13×10⁻¹¹
- Alqueire mineiro2.07×10⁻¹¹
- Alqueire baiano1.03×10⁻¹¹
- Alqueire do norte3.68×10⁻¹¹