WGS84 to NAD27 Coordinate Converter
Free online tool to convert coordinates from World Geodetic System 1984 (lat/lng) (EPSG:4326) to North American Datum 1927 (EPSG:4267). Professional-grade accuracy using proj4, zero install, runs in your browser.
About WGS84
World Geodetic System 1984 (lat/lng) (EPSG:4326). The global reference system used by GPS, Google Maps and virtually all modern navigation. Defined by satellite geodesy and continuously refined.
About NAD27
North American Datum 1927 (EPSG:4267). Legacy US datum (Clarke 1866 ellipsoid). Still encountered in older maps and legal property descriptions. Can differ up to 90m from WGS84 in western US.
Frequently Asked Questions
What is the difference between WGS84 and NAD27?
WGS84 (EPSG:4326) is geographic and based in Global, while NAD27 (EPSG:4267) is geographic based in USA. The global reference system used by GPS, Google Maps and virtually all modern navigation. Defined by satellite geodesy and continuously refined. In contrast, legacy us datum (clarke 1866 ellipsoid). still encountered in older maps and legal property descriptions. can differ up to 90m from wgs84 in western us.
Is this conversion accurate for surveying?
Yes. The conversion uses the industry-standard proj4 library with full datum shift parameters (). Typical accuracy is sub-meter for civilian applications. For cadastral precision, always verify against the official agency datum.
What coordinate format should I use?
For WGS84, enter coordinates as decimal degrees in the format "lat, lng" (e.g. 45.4642, 9.1900). The tool auto-detects the format.
Can I convert many points at once?
Yes, use our batch CSV converter. Upload a CSV with your points, select the transformation, download the converted file. Free with a SurveyingPedia account.
Is there an API?
Yes — call /api/v1/transform?from=EPSG:4326&to=EPSG:4267&coords=lat,lng for programmatic access. It returns the transformed coordinates as JSON.