Convert Square Millimeters to Square Chains
Convert Square Millimeters (mm²) to Square Chains (ch²) instantly and accurately.
Conversion Formula
ch² = mm² × 2.471053815e-9
About Square Millimeters
A square millimeter (mm²) is a metric unit of area equal to a square with sides of one millimeter. It is commonly used in precision engineering, electronics, and measuring very small surfaces such as microchips or printed circuit boards. To visualise: a typical pinhead has an area of about 2-3 mm². This unit is essential in microscopy, medical imaging, and manufacturing where tiny, precise measurements are critical.
About Square Chains
A square chain (ch²) is a surveying unit equal to the area of a square with sides of one Gunter's chain (66 feet or ~20.12 m), approximately 404.69 m². Ten square chains equal exactly one acre, making it the natural subdivision unit in traditional land surveying. The US Public Land Survey System used chains to lay out townships and sections, and square chains appear throughout old legal property descriptions and government land grants across North America. One square chain equals exactly 16 square rods.
Quick Reference Table
| Square Millimeters (mm²) | Square Chains (ch²) |
|---|---|
| 1 mm² | 2.471 × 10-9 ch² |
| 2 mm² | 4.942 × 10-9 ch² |
| 5 mm² | 1.236 × 10-8 ch² |
| 10 mm² | 2.471 × 10-8 ch² |
| 25 mm² | 6.178 × 10-8 ch² |
| 50 mm² | 1.236 × 10-7 ch² |
| 100 mm² | 2.471 × 10-7 ch² |