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EPSG:3857 Coordinate Reference System

Projected CRS · WGS 84 / Pseudo-Mercator · metres · commonly used for web maps; scale and distance distortion increase away from the equator. Inspect EPSG:3857 as included in the GeoCAD Bridge CRS catalog. Use the converter below to transform test coordinates to another bundled CRS. For authoritative operation metadata and datum accuracy, consult the EPSG Registry; this page reports no accuracy unsupported by bundled data.

Transforms run in your browser. The basemap provider receives tile requests for the visible map area.

Transformation uses the bundled proj4js definitions. No authoritative accuracy metadata or datum grids are available here.

How coordinate transformation works

The app converts through the source and target projection definitions bundled with the application. Datum changes may require parameters or grids that are not available; this page does not claim unsupported accuracy.

Related tools

CRS details for engineering use

Review the CRS type, projection method, datum, units, axis order and area of use before mixing CAD, GIS and survey data. EPSG pages in GeoCAD Bridge link directly to transformation tools so test coordinates can be checked before production delivery.

EPSG reference data

Definition

EPSG:3857 as published in the EPSG Dataset (PROJ 9.5.1).
PropertyValue
EPSG codeEPSG:3857
NameWGS 84 / Pseudo-Mercator
TypeProjected CRS
DatumWorld Geodetic System 1984 ensemble (ensemble, accuracy ≈ 2.0 m)
EllipsoidWGS 84 (a = 6,378,137.000 m, 1/f = 298.257224)
Prime meridianGreenwich
Projection methodPopular Visualisation Pseudo Mercator
AxesEasting (X, east, metre); Northing (Y, north, metre)
ScopeWeb mapping and visualisation.
Bounding box-180° to 180° longitude, -85.06° to 85.06° latitude

Area of use

World between 85.06°S and 85.06°N.

Projection parameters

Popular Visualisation Pseudo Mercator parameters.
ParameterValueUnit
Latitude of natural origin0degree
Longitude of natural origin0degree
False easting0metre
False northing0metre

Example coordinates

A WGS 84 point at longitude 46.6753°, latitude 24.7136° (inside the area of use) has these coordinates in EPSG:3857:

Computed with PROJ using the EPSG default operation: axis order change (2D) + Popular Visualisation Pseudo-Mercator.
AxisValueUnit
X5,195,870.629m
Y2,840,607.626m

At this point the projection scale factor is 1.10082577 and the grid convergence is -0.000000°.

Open this conversion in the coordinate converter

Definitions and downloads

PROJ string

+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

A PROJ string cannot carry every EPSG detail (axis order, datum ensemble, transformations). Prefer WKT2 or the EPSG code itself.

Proj4js definition used by the converter

+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

No datum shift is needed: this CRS is on WGS 84 or a datum Proj4js treats as equivalent at the metre level.

WKT2:2019
PROJCRS["WGS 84 / Pseudo-Mercator", BASEGEOGCRS["WGS 84", ENSEMBLE["World Geodetic System 1984 ensemble", MEMBER["World Geodetic System 1984 (Transit)"], MEMBER["World Geodetic System 1984 (G730)"], MEMBER["World Geodetic System 1984 (G873)"], MEMBER["World Geodetic System 1984 (G1150)"], MEMBER["World Geodetic System 1984 (G1674)"], MEMBER["World Geodetic System 1984 (G1762)"], MEMBER["World Geodetic System 1984 (G2139)"], MEMBER["World Geodetic System 1984 (G2296)"], ELLIPSOID["WGS 84",6378137,298.257223563, LENGTHUNIT["metre",1]], ENSEMBLEACCURACY[2.0]], PRIMEM["Greenwich",0, ANGLEUNIT["degree",0.0174532925199433]], ID["EPSG",4326]], CONVERSION["Popular Visualisation Pseudo-Mercator", METHOD["Popular Visualisation Pseudo Mercator", ID["EPSG",1024]], PARAMETER["Latitude of natural origin",0, ANGLEUNIT["degree",0.0174532925199433], ID["EPSG",8801]], PARAMETER["Longitude of natural origin",0, ANGLEUNIT["degree",0.0174532925199433], ID["EPSG",8802]], PARAMETER["False easting",0, LENGTHUNIT["metre",1], ID["EPSG",8806]], PARAMETER["False northing",0, LENGTHUNIT["metre",1], ID["EPSG",8807]]], CS[Cartesian,2], AXIS["easting (X)",east, ORDER[1], LENGTHUNIT["metre",1]], AXIS["northing (Y)",north, ORDER[2], LENGTHUNIT["metre",1]], USAGE[ SCOPE["Web mapping and visualisation."], AREA["World between 85.06°S and 85.06°N."], BBOX[-85.06,-180,85.06,180]], ID["EPSG",3857]]

Downloads

FAQ

What is EPSG:3857?

EPSG:3857 (WGS 84 / Pseudo-Mercator) is a projected coordinate reference system on the World Geodetic System 1984 ensemble datum using the Popular Visualisation Pseudo Mercator method, with coordinates in metres. Area of use: World between 85. The datum is an ensemble with about 2.0 m accuracy, so precise work should name a specific realization.

Where can EPSG:3857 be used?

Its area of use is: World between 85.06°S and 85.06°N.

Is EPSG:3857 in metres or degrees?

EPSG:3857 is projected, so coordinates are easting and northing in metres, not degrees.

How do I convert EPSG:3857 to latitude and longitude?

Transform from EPSG:3857 to EPSG:4326 (WGS 84). In GeoCAD Bridge open the coordinate converter with EPSG:3857 preselected, enter easting and northing, and choose WGS 84 as the target.