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NAD27 and NAD83

Move coordinates between NAD27 and NAD83 the way NOAA does.

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About this conversion

  • All conversions are performed by NOAA, through NCAT, the National Geodetic Survey's service, and its NADCON 5.0 transformation grids. That is the official method for shifting coordinates between NAD27 and NAD83.
  • This page's NAD83 is the original realization, NOAA's NAD83 (1986), and FCC applications state coordinates in NAD83. Moving from NAD27 typically shifts a point by tens of meters across the lower 48, and further in Alaska.
  • NAD27 covered only the contiguous U.S. and Alaska, so it cannot be used to convert points in Hawaii, Puerto Rico or the territories.
  • Both coordinates you enter are assumed to be in the source datum. A positive longitude with no direction is treated as west.

The NOAA tool itself: NCAT (see also NADCON 5 info).

Intended for planning. Not a NOAA or FCC product.