Can anyone show me the process of converting a Lat/Lon to coordinates?

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Subject Tags: converter, coordinates

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Hello John,


To start go to the NGS Tool Kit here:



exactly...  we also have a reverse geocoder on the site under TOOLS in the navigation...

Hello John,

If you want to do it long hand, try these...


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Hello John

i posted spreadsheet on Excel spreadsheet forumThe formulas used in calculations are adopted from Redfern Formula

may it can help.



I just got a Autocad macro (vba project) working that will convert State Plane Coordinates to Latitude and Longitude. Click a point in the drawing and it converts the SPCS of that point to Lat/Long and then labels the values at the point you clicked. You can also Enter Lat/Long and a point is plotted and labeled.

You must have the corpscon_v6.dll in C:\program files\Corpscon6 along with the folders containing geoid, nadcon, vertcon data files. These are installed with the free download from

I tested in Autocad 2004 and 2013. The form is setup for my local SPCS zones (1601 and 1602), but it can be modified for any zone(s). 

email me if interested.


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