Source: 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=crsMore about EPSG:4326 →
Convert EPSG:4326 to EPSG:31370
Online coordinate converter from WGS 84 (EPSG:4326) to BD72 / Belgian Lambert 72 (EPSG:31370). Enter your source coordinates and get the result instantly. All transformations happen in your browser — no data is sent to any server.
About converting WGS 84 to BD72 / Belgian Lambert 72
Converting from WGS 84 (EPSG:4326) to Belgian Lambert 72 (EPSG:31370) is the standard transformation for working with Belgian cadastral and federal mapping data. The conversion involves both a Lambert Conformal Conic projection and a datum shift from WGS 84 to Belgium 1972 (~70 cm offset).
Browser tools use a Helmert seven-parameter transformation, accurate to a few decimetres. For cadastre or surveying-grade work the Belgian National Geographic Institute publishes higher-precision grid transformations.
Why people convert EPSG:4326 to EPSG:31370
- Belgian cadastre and Land Registry
- NGI national mapping
- Walloon, Flemish and Brussels regional GIS
- Public open-data portals in Belgium
Try it: Grand Place, Brussels
Input (EPSG:4326): 4.3525, 50.8467
Convert EPSG:4326 to EPSG:31370 in code
The same transformation with common GIS tools and libraries:
from pyproj import Transformer
transformer = Transformer.from_crs("EPSG:4326", "EPSG:31370", always_xy=True)
x, y = transformer.transform(-73.9857, 40.7484)
print(x, y)Target: EPSG:31370 — BD72 / Belgian Lambert 72
projected system measured in linear units (typically metres) · Area of use: Belgium - onshore
+proj=lcc +lat_0=90 +lon_0=4.36748666666667 +lat_1=51.1666672333333 +lat_2=49.8333339 +x_0=150000.013 +y_0=5400088.438 +ellps=intl +units=m +no_defs +type=crsMore about EPSG:31370 →
Frequently asked questions
- Is the conversion accurate enough for cadastre?
- Helmert-based browser conversions reach ~0.5 m accuracy. For cadastral work use the official Belgian grid transformation in a desktop GIS.
- How accurate is converting WGS 84 to BD72 / Belgian Lambert 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.