Skip to content
transform

Convert EPSG:4403 to EPSG:4978

Online coordinate converter from NAD27 / BLM 3N (ftUS) (EPSG:4403) to WGS 84 (EPSG:4978). 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-4403-to-epsg-4978

Convert EPSG:4403 to EPSG:4978 in code

The same transformation with common GIS tools and libraries:

from pyproj import Transformer

transformer = Transformer.from_crs("EPSG:4403", "EPSG:4978", always_xy=True)
x, y = transformer.transform(-73.9857, 40.7484)
print(x, y)

Source: EPSG:4403 — NAD27 / BLM 3N (ftUS)

projected system measured in linear units (typically metres) · Area of use: USA - 168°W to 162°W - AK, OCS

+proj=tmerc +lat_0=0 +lon_0=-165 +k=0.9996 +x_0=500000.001016002 +y_0=0 +datum=NAD27 +units=us-ft +no_defs +type=crs
More about EPSG:4403 →

Target: EPSG:4978 — WGS 84

geocentric Cartesian system (Earth-centred Earth-fixed) · Area of use: World

+proj=geocent +datum=WGS84 +units=m +no_defs +type=crs
More about EPSG:4978 →

Frequently asked questions

How accurate is converting NAD27 / BLM 3N (ftUS) to WGS 84?
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:4978 to EPSG:4403 →