Convert Lat/Long to Web Mercator

Generate EPSG:3857 (Web Mercator) X/Y coordinates from standard GPS Lat/Long. Used for positioning elements on web maps like Google Maps and OpenStreetMap.

How to Use

Enter WGS84 Coordinates. Click Convert.

Online Tool

Input: WGS84
Output: EPSG:3857
⚠️ Datum Hazard: Read Before Conversion

Coordinate values only have meaning when attached to a Datum.

  • WGS84: Standard for GPS, Google Maps, Web Mercator.
  • NAD27: Used in older USGS topographic maps (pre-1983).

Using the wrong datum can shift your position by 20-100+ meters. Always verify the source datum of your coordinates.

Use Cases

FAQ

Q: What is Web Mercator?

A: It's the standard projection (EPSG:3857) used by most web maps. It treats the world as a square grid.

Q: Can I use this for measuring distance?

A: No. Web Mercator distorts scale significantly away from the Equator. Use Haversine or Vincenty for distance.

Q: What is the max latitude?

A: Web Mercator is clipped at approx +/- 85.05 degrees.

Professional Verification Disclaimer

This content is provided for decision-support and educational purposes for geospatial professionals and does not constitute legal, surveying, or engineering advice. Regulations and official standards vary by jurisdiction and project scope. Information is based on publicly available standards as of January 11, 2026. For critical projects, always verify current requirements with:

Reference: Professional Use & Scope

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Professional engineering and surveying transformations from state-specific conformal grids to GPS WGS84.

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Professional Risk Notice

Using the wrong datum or applying coordinates without grid-to-ground correction can cause 1–400 metre positional errors — a leading cause of surveying negligence claims and contract disputes.

📋 See Legal Cases ($25K–$10M) → 📝 Contract Datum Risk → ⚙️ Calculate My Exposure →