Convert Square Millimeter (mm²) to Hectare (ha) instantly.
About these units
Square Millimeter (mm²)
A square millimeter represents the area of a square measuring 1 millimeter on each side. It is a tiny unit used extensively in engineering, electronics, material science, and medical instrumentation. Mechanical designers use mm² to determine cross-sectional areas of wires, beams, micro-mechanical parts, and precision components. In electronics, PCB traces, microchips, and sensors often specify dimensions in mm² for clarity and precision. Biomedical sciences also use mm² for cell colony measurements, tissue sample surfaces, and microscopic fields of view. Its size makes it ideal for quantifying structures too small for cm² but too large for micrometer-scale units.
Hectare (ha)
A hectare is equal to 10,000 m², or 0.01 km², and is the standard unit of land measurement in agriculture, forestry, and land management across most of the world. Unlike the acre, which comes from historical English land systems, the hectare is fully metric and integrates cleanly into scientific practice. Farmers use hectares to measure fields, crop yields, irrigation requirements, and livestock capacity. Foresters rely on hectares for forest inventories, timber production estimates, and biodiversity assessments. Urban planners use hectares when describing zoning, green space, and population density. The hectare is the perfect intermediate scale: large enough for meaningful land plots, and small enough to avoid unwieldy numbers when describing farms or urban districts.