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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.
37° 35′ 46.03″ N 84° 50′ 18.97″ W
NAD27, converted from NAD83(1986) with NADCON 5.0.
| NAD83(1986) (entered) | 37° 35′ 46.30″ N 84° 50′ 18.80″ W37.596194, -84.838556 |
|---|---|
| NAD27 | 37° 35′ 46.03″ N 84° 50′ 18.97″ W37.596119, -84.838603 |
| Rounded to the second | 37° 35′ 46″ N 84° 50′ 19″ W |
| Shift | 8.4 m south, 4.2 m west9.4 m (31 ft) in all |
| NOAA's stated uncertainty | ±0.24 m latitude, ±0.19 m longitudeOne standard deviation of the NADCON 5 transformation here |
| UTM (NAD27) | UTM Zone 16: 4,162,996.785 m N, 690,817.266 m EUSNG 16SFG9081762997 |
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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.