Convert Square Chains to Square Nautical Miles
Convert Square Chains (ch²) to Square Nautical Miles (nmi²) instantly and accurately.
Conversion Formula
nmi² = ch² × 0.0001179874545
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.
About Square Nautical Miles
A square nautical mile (nmi²) equals the area of a square with sides of one nautical mile (1,852 m), giving approximately 3,429,904 m² - about 343 hectares. This unit is used in maritime and aviation contexts to describe patrol zones, territorial extents, and maritime boundaries. Exclusive Economic Zones (EEZs) and military operating areas are often quoted in square nautical miles. One square nautical mile is approximately 1.32 square statute miles.
Quick Reference Table
| Square Chains (ch²) | Square Nautical Miles (nmi²) |
|---|---|
| 1 ch² | 0.000117987 nmi² |
| 2 ch² | 0.000235975 nmi² |
| 5 ch² | 0.000589937 nmi² |
| 10 ch² | 0.00117987 nmi² |
| 25 ch² | 0.00294969 nmi² |
| 50 ch² | 0.00589937 nmi² |
| 100 ch² | 0.0117987 nmi² |