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Convert EPSG:3991 to EPSG:3857

Online coordinate converter from Puerto Rico State Plane CS of 1927 (EPSG:3991) to WGS 84 / Pseudo-Mercator (EPSG:3857). 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-3991-to-epsg-3857

Convert EPSG:3991 to EPSG:3857 in code

The same transformation with common GIS tools and libraries:

from pyproj import Transformer

transformer = Transformer.from_crs("EPSG:3991", "EPSG:3857", always_xy=True)
x, y = transformer.transform(-73.9857, 40.7484)
print(x, y)

Source: EPSG:3991 — Puerto Rico State Plane CS of 1927

projected system measured in linear units (typically metres) · Area of use: Puerto Rico - onshore

+proj=lcc +lat_0=17.8333333333333 +lon_0=-66.4333333333333 +lat_1=18.4333333333333 +lat_2=18.0333333333333 +x_0=152400.30480061 +y_0=0 +ellps=clrk66 +units=us-ft +no_defs +type=crs
More about EPSG:3991 →

Target: EPSG:3857 — WGS 84 / Pseudo-Mercator

projected system measured in linear units (typically metres) · Area of use: World - 85°S to 85°N

+proj=merc +a=6378137 +b=6378137 +lat_ts=0 +lon_0=0 +x_0=0 +y_0=0 +k=1 +units=m +nadgrids=@null +wktext +no_defs +type=crs
More about EPSG:3857 →

Frequently asked questions

How accurate is converting Puerto Rico State Plane CS of 1927 to WGS 84 / Pseudo-Mercator?
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:3857 to EPSG:3991 →