Hectare to Square Millimeter Converter

A hectare (ha) is a metric unit of area equal to 10,000 square meters or 0.01 square kilometers. It represents the area of a square with 100-meter sides, making it convenient for measuring medium to large land areas.

The hectare was introduced in 1795 as part of the original metric system during the French Revolution. The name comes from the Greek 'hekaton' meaning 'hundred' and the Latin 'area'. It was designed to provide a practical unit for agricultural and land measurement, filling the gap between square meters and square kilometers.

Hectares are extensively used in agriculture, forestry, real estate, and land management worldwide. They're the standard unit for farm sizes, forest areas, park measurements, and land development projects. Most countries use hectares for official land area measurements and agricultural statistics.

A square millimeter (mm²) is a unit of area equal to the area of a square with sides of one millimeter each. It equals 0.000001 square meters, providing precise measurement for very small areas.

The square millimeter emerged from the metric system as precision engineering and manufacturing developed. The millimeter (1/1000 of a meter) was squared to create a unit suitable for measuring tiny areas, becoming essential with the advancement of precision manufacturing and microscopy.

Square millimeters are used in precision engineering, electronics, medical diagnostics, materials science, and microscopy. They're essential for measuring cross-sectional areas of wires, small components, biological specimens, and in quality control for manufactured parts.