Convert between EPSG:3857 X/Y (metres) and WGS 84 longitude/latitude
Toggle between Mercator-to-WGS84 and WGS84-to-Mercator
EPSG:3857 used by OpenStreetMap, Google Maps, Mapbox
Powered by proj4js for accurate spherical Mercator math
Convert coordinates from EPSG:3857 system to WGS84 system
Choose your direction — WGS84 longitude/latitude to EPSG:3857 meters, or the reverse — then enter the coordinates in the corresponding input fields.
Click Convert and proj4js applies the spherical Mercator formulas in the chosen direction, with full double precision.
Copy the resulting X/Y in meters (or degrees) for your tile server, WebGL map, or spatial database. The tool is free and everything is computed in your browser.
AThe projection uses a sphere of radius 6,378,137 m, so half its equatorial circumference is 2 x Pi x 6378137 / 2 / 2 = 20,037,508.34 m. That limit corresponds to latitude ±85.0511°, the clamping point chosen so tile grids divide the world into neat powers of two — anything closer to the poles simply cannot be shown.
AEPSG:4326 stores positions as latitude/longitude in degrees on the WGS84 ellipsoid, while EPSG:3857 projects those onto a flat plane with coordinates in meters. Google Maps, OpenStreetMap, Mapbox, and most raster tile services serve imagery in 3857, so conversions between the two are a daily task for web-map developers.
AYes. Scale is true only at the equator and inflates toward the poles, growing by a factor of about 1/cos(latitude) — roughly 1.6x in Iceland and over 2x in Fairbanks. Use it for display and tiling, not for measuring real-world lengths.