Source: EPSG:4978 — WGS 84
geocentric Cartesian system (Earth-centred Earth-fixed) · Area of use: World
+proj=geocent +datum=WGS84 +units=m +no_defs +type=crsMore about EPSG:4978 →
Convert EPSG:4978 to EPSG:9920
Online coordinate converter from WGS 84 (EPSG:4978) to OSGB36 / British National Grid + BI height (EPSG:9920). Enter your source coordinates and get the result instantly. All transformations happen in your browser — no data is sent to any server.
Convert EPSG:4978 to EPSG:9920 in code
The same transformation with common GIS tools and libraries:
from pyproj import Transformer
transformer = Transformer.from_crs("EPSG:4978", "EPSG:9920", always_xy=True)
x, y = transformer.transform(-73.9857, 40.7484)
print(x, y)Target: EPSG:9920 — OSGB36 / British National Grid + BI height
compound horizontal + vertical reference system · Area of use: UK - Britain and UKCS 49°45'N to 61°N, 9°W to 2°E
+proj=tmerc +lat_0=49 +lon_0=-2 +k=0.9996012717 +x_0=400000 +y_0=-100000 +ellps=airy +units=m +vunits=m +no_defs +type=crsMore about EPSG:9920 →
Frequently asked questions
- How accurate is converting WGS 84 to OSGB36 / British National Grid + BI height?
- 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.