Source: EPSG:4230 — ED50
geographic system using latitude and longitude on an ellipsoid · Area of use: Europe - ED50 by country
+proj=longlat +ellps=intl +no_defs +type=crsMore about EPSG:4230 →
Convert EPSG:4230 to EPSG:4277
Online coordinate converter from ED50 (EPSG:4230) to OSGB36 (EPSG:4277). Enter your source coordinates and get the result instantly. All transformations happen in your browser — no data is sent to any server.
The EPSG dataset defines official transformation parameters for the reverse direction. See OSGB36 to ED50 — the parameters are invertible.
Convert EPSG:4230 to EPSG:4277 in code
The same transformation with common GIS tools and libraries:
from pyproj import Transformer
transformer = Transformer.from_crs("EPSG:4230", "EPSG:4277", always_xy=True)
x, y = transformer.transform(-73.9857, 40.7484)
print(x, y)Target: EPSG:4277 — OSGB36
geographic system using latitude and longitude on an ellipsoid · Area of use: UK - Britain and UKCS 49°45'N to 61°N, 9°W to 2°E
+proj=longlat +ellps=airy +no_defs +type=crsMore about EPSG:4277 →
Frequently asked questions
- How accurate is converting ED50 to OSGB36?
- 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.