Convert Hong Kong 1980 to WGS 84

Convert coordinates from Hong Kong 1980 (EPSG:4611) to WGS 84 (EPSG:4326) — official EPSG transformation parameters, accuracy and area of use, with a free in-browser converter.

From

Input (lon, lat (decimal degrees))

Output (lon, lat (decimal degrees))

Direct link to this transformation: epsgtransform.com/transform/epsg-4611-to-epsg-4326

Official EPSG transformation from Hong Kong 1980 to WGS 84

The EPSG Geodetic Parameter Dataset defines 1 transformation between Hong Kong 1980 (EPSG:4611) and WGS 84 (EPSG:4326). Its parameters, accuracy and area of use are listed below.

Hong Kong 1980 to WGS 84 (1)

EPSG:1825±1 m

Method:: Coordinate Frame rotation (geog2D domain)
Area of use:: Hong Kong
Scope:: (null/copy) Approximation for medium and low accuracy applications assuming equality between plate-fixed static and earth-fixed dynamic CRSs, ignoring static/dynamic CRS differences.

Parameter	Value	Unit
X-axis translation(tx)	-162.619	metre
Y-axis translation(ty)	-276.959	metre
Z-axis translation(tz)	-161.764	metre
X-axis rotation(rx)	-0.067753	arc-second
Y-axis rotation(ry)	2.243648	arc-second
Z-axis rotation(rz)	1.158828	arc-second
Scale difference(ds)	-1.094246	parts per million

Derived via ITRF96 @ 1998.121. Published 2002-03-01. Parameter values from Hong Kong 1980 to Hong Kong Geodetic CS (1) (code 9913) assuming Hong Kong Geodetic CS and WGS 84 are equivalent within the accuracy of the CT.

Convert EPSG:4611 to EPSG:4326 in code

The same transformation with common GIS tools and libraries:

from pyproj import Transformer

transformer = Transformer.from_crs("EPSG:4611", "EPSG:4326", always_xy=True)
x, y = transformer.transform(-73.9857, 40.7484)
print(x, y)

Source: EPSG:4611 — Hong Kong 1980

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

+proj=longlat +ellps=intl +towgs84=-162.619,-276.959,-161.764,0.067753,-2.243648,-1.158828,-1.094246 +no_defs +type=crs

More about EPSG:4611 →

Target: EPSG:4326 — WGS 84

geographic system using latitude and longitude on an ellipsoid · Area of use: World (by country)

+proj=longlat +datum=WGS84 +no_defs +type=crs

More about EPSG:4326 →

Frequently asked questions

How accurate is converting Hong Kong 1980 to WGS 84?: The most accurate official EPSG transformation between these systems is accurate to about ±1 m within its stated area of use. Browser-based converters approximate datum shifts with Helmert parameters; for surveying-grade work apply the official 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:4326 to EPSG:4611 →