Convert EPSG:29901 to EPSG:4322

Online coordinate converter from OSNI 1952 / Irish National Grid (EPSG:29901) to WGS 72 (EPSG:4322). Enter your source coordinates and get the result instantly. All transformations happen in your browser — no data is sent to any server.

From

Input (x, y)

Output (lon, lat (decimal degrees))

Direct link to this transformation: epsgtransform.com/transform/epsg-29901-to-epsg-4322

Convert EPSG:29901 to EPSG:4322 in code

The same transformation with common GIS tools and libraries:

from pyproj import Transformer

transformer = Transformer.from_crs("EPSG:29901", "EPSG:4322", always_xy=True)
x, y = transformer.transform(-73.9857, 40.7484)
print(x, y)

Source: EPSG:29901 — OSNI 1952 / Irish National Grid

projected system measured in linear units (typically metres) · Area of use: UK - Northern Ireland - onshore

+proj=tmerc +lat_0=53.5 +lon_0=-8 +k=1 +x_0=200000 +y_0=250000 +ellps=airy +towgs84=482.5,-130.6,564.6,-1.042,-0.214,-0.631,8.15 +units=m +no_defs +type=crs

More about EPSG:29901 →

Target: EPSG:4322 — WGS 72

geographic system using latitude and longitude on an ellipsoid · Area of use: World

+proj=longlat +ellps=WGS72 +no_defs +type=crs

More about EPSG:4322 →

Frequently asked questions

How accurate is converting OSNI 1952 / Irish National Grid to WGS 72?: Projection-only conversions are accurate to floating-point precision. If a datum shift is involved, browser-based tools use Helmert parameters which are accurate to roughly 1-5 m; for surveying-grade work apply the official grid-shift transformation in a desktop GIS.
Does my data leave the browser when I use this converter?: No. All coordinate transformations are computed locally in your browser using proj4js. The coordinates you enter are never transmitted to any server.

Need the reverse? Convert EPSG:4322 to EPSG:29901 →