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Convert EPSG:21231 to EPSG:4267

Online coordinate converter from GSK-2011 / GSK 3GK zone 31 (EPSG:21231) to NAD27 (EPSG:4267). Enter your source coordinates and get the result instantly. All transformations happen in your browser — no data is sent to any server.

Direct link to this transformation: epsgtransform.com/transform/epsg-21231-to-epsg-4267

Convert EPSG:21231 to EPSG:4267 in code

The same transformation with common GIS tools and libraries:

from pyproj import Transformer

transformer = Transformer.from_crs("EPSG:21231", "EPSG:4267", always_xy=True)
x, y = transformer.transform(-73.9857, 40.7484)
print(x, y)

Source: EPSG:21231 — GSK-2011 / GSK 3GK zone 31

projected system measured in linear units (typically metres) · Area of use: Russia - 91.5°E to 94.5°E onshore

+proj=tmerc +lat_0=0 +lon_0=93 +k=1 +x_0=31250000 +y_0=0 +ellps=GSK2011 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs +type=crs
More about EPSG:21231 →

Target: EPSG:4267 — NAD27

geographic system using latitude and longitude on an ellipsoid · Area of use: North America - NAD27

+proj=longlat +datum=NAD27 +no_defs +type=crs
More about EPSG:4267 →

Frequently asked questions

How accurate is converting GSK-2011 / GSK 3GK zone 31 to NAD27?
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:4267 to EPSG:21231 →