緯度群を変換 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
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What this result means for your project:

Calculated at 6 decimal places (0.11m precision). WGS84 geodetic model applied. Result requires epoch verification for tectonic drift.

⚠️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

Related Coordinate Conversion ツール一覧

US State Plane (SPCS) Converters & Local Guides

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

🔗 Related ツール一覧 & Resources

Explore our full suite of coordinate transformation and compliance tools:

🛠のGIS ツール一覧 Hub 🌍 Universal Sandbox (EPSG Explorer) 🎯 LatLong —UTM 🛡️Datum Compliance Engine
専門家による測地検証済み
専門的な測地基準に準拠して検証済み

The $50,000 Geodetic Drift Liability: NAD83 vs WGS84

北米プレートは年間約2cm移動するため、NAD83(2011)とWGS84(G1762)は現在2.2メートル以上乖離しています。 高精度なNAD83地籍杭打ちに「標準的な」GPS WGS84座標を使用したことで、基礎のやり直しやインフラの配置ミスによる5万ドルの専門家責任賠償請求が発生しています。

Risk Exposure Metric: 2.2-Meter Tectonic Drift & Epoch Accumulation
Professional Knowledge Graph: