# What's the difference between EPSG:4326 and EPSG:900913?

I am a bit confused on EPSG:4326 and EPSG:900913. I thought that they were both same. Though as I am placing my features over GMaps, which is EPSG:4326, I need to define the srsname of the WFS layer as EPSG:900913 to get it into the right place. If I define srsname as 4326 it is projected somewhere completely wrong.

Could someone explain it a bit more in detail as to what is wrong here?

• Yes, it does. The two are exactly equivalent. Commented Nov 20, 2012 at 20:25
• To add to R.K.'s answer, EPSG:900913 uses an authalic sphere. Commented Jan 24, 2013 at 7:55
• As a point of trivia: 900913 was originally rejected as a credible projection by European Petroleum Survey Group (EPSG) so Google (who invented it for the web) gave it their own number, which if you type it on an old fashioned calculator spells 'googlE' (substitute '9' for 'g' and squint a bit). Eventually EPSG relented and allowed 900913 into its geodetic repository but gave it the number 3857. Commented Jan 24, 2013 at 8:10
• @arcsump, 900913 (3857) does not use an authalic sphere. It uses a sphere with a radius equal to the semimajor axis of WGS 1984 ellipsoid. Commented Jan 24, 2013 at 17:52
• @sylvester-sneekly, Google did not define 900913, Christopher Schmidt of OpenLayers did: crschmidt.net/blog/archives/243/google-projection-900913 Commented Jan 24, 2013 at 17:54

• EPSG:4326 does not need decimal degree values. See the EPSG registry `Coordinates referenced to this CS are in degrees. Any degree representation (e.g. DMSH, decimal, etc.) may be used but that used must be declared for the user by the supplier of data. Used in geographic 2D coordinate reference systems.` ~ epsg.org/unit_9122/… Commented Jun 8, 2023 at 10:44