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NAD27 to NAD83 coordinate converter
Old tower records, deeds and FAA studies often give coordinates in NAD27; today's FCC filings use NAD83. Convert either way with NOAA's official NADCON 5 grids, in decimal degrees or degrees, minutes and seconds.
42° 21′ 28.31″ N 74° 32′ 22.26″ W
NAD27, converted from NAD83(1986) with NADCON 5.0.
| NAD83(1986) (entered) | 42° 21′ 28.60″ N 74° 32′ 20.80″ W42.357944, -74.539111 |
|---|---|
| NAD27 | 42° 21′ 28.31″ N 74° 32′ 22.26″ W42.357863, -74.539517 |
| Rounded to the second | 42° 21′ 28″ N 74° 32′ 22″ W |
| Shift | 9.0 m south, 33.4 m west34.6 m (114 ft) in all |
| NOAA's stated uncertainty | ±0.20 m latitude, ±0.16 m longitudeOne standard deviation of the NADCON 5 transformation here |
| UTM (NAD27) | UTM Zone 18: 4,689,399.190 m N, 537,922.794 m EUSNG 18TWM3792389399 |
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About the conversion
- Every conversion is NOAA's: the National Geodetic Survey's NCAT service with the NADCON 5.0 transformation grids, the official way to move coordinates between NAD27 and NAD83.
- NAD83 here is NOAA's NAD83 (1986), the original NAD83; FCC applications give coordinates in NAD83. The shift from NAD27 is typically tens of meters in the lower 48 and more in Alaska.
- NAD27 was used in the contiguous U.S. and Alaska only, so points in Hawaii, Puerto Rico and the territories can't be converted from it.
- The two coordinates entered are taken as being in the datum you convert from. A bare positive longitude is read as west.
NOAA's own tool: NCAT (and about NADCON 5).
For planning. Not a product of NOAA or the FCC.