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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.
40° 39′ 12.20″ N 112° 12′ 06.20″ W
NAD27, converted from NAD83(1986) with NADCON 5.0.
| NAD83(1986) (entered) | 40° 39′ 12.00″ N 112° 12′ 09.00″ W40.653333, -112.202500 |
|---|---|
| NAD27 | 40° 39′ 12.20″ N 112° 12′ 06.20″ W40.653388, -112.201722 |
| Rounded to the second | 40° 39′ 12″ N 112° 12′ 06″ W |
| Shift | 6.1 m north, 65.8 m east66.1 m (217 ft) in all |
| NOAA's stated uncertainty | ±0.17 m latitude, ±0.14 m longitudeOne standard deviation of the NADCON 5 transformation here |
| UTM (NAD27) | UTM Zone 12: 4,500,763.921 m N, 398,401.899 m EUSNG 12TUL9840200764 |
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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.