Convert EPSG:4660 to EPSG:4269

Online coordinate converter from Helle 1954 (EPSG:4660) to NAD83 (EPSG:4269). Enter your source coordinates and get the result instantly. All transformations happen in your browser — no data is sent to any server.

From

Input (lon, lat (decimal degrees))

Output (lon, lat (decimal degrees))

Direct link to this transformation: epsgtransform.com/transform/epsg-4660-to-epsg-4269

Convert EPSG:4660 to EPSG:4269 in code

The same transformation with common GIS tools and libraries:

from pyproj import Transformer

transformer = Transformer.from_crs("EPSG:4660", "EPSG:4269", always_xy=True)
x, y = transformer.transform(-73.9857, 40.7484)
print(x, y)

Source: EPSG:4660 — Helle 1954

geographic system using latitude and longitude on an ellipsoid · Area of use: Jan Mayen - onshore

+proj=longlat +ellps=intl +towgs84=982.6087,552.753,-540.873,6.68162662527694,-31.6114924086422,-19.8481610048168,16.805 +no_defs +type=crs

More about EPSG:4660 →

Target: EPSG:4269 — NAD83

geographic system using latitude and longitude on an ellipsoid · Area of use: North America - NAD83

+proj=longlat +datum=NAD83 +no_defs +type=crs

More about EPSG:4269 →

Frequently asked questions

How accurate is converting Helle 1954 to NAD83?: 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:4269 to EPSG:4660 →