TechTools

Geodetic Coordinate Converter

a = 6,378,137 m  |  1/f = 298.257223563

Geographic Coordinates (input)

Geographic → ECEF (Earth-Centered Earth-Fixed)
Result
X4200958.827m
Y168324.024m
Z4780239.400m

ECEF: Earth-Centered Earth-Fixed. Origin at Earth's center of mass. Z-axis toward north pole. Used in GPS.

ENU: East-North-Up local tangent plane. Coordinates relative to a reference point on the surface.

Ellipsoidal height ≠ orthometric height (above sea level). Difference = geoid undulation (N).

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Professional geodetic coordinate conversion between three reference frames: Geographic (latitude, longitude, ellipsoidal height), ECEF (Earth-Centered Earth-Fixed X/Y/Z cartesian), and ENU (East-North-Up local tangent plane). Supports 7 reference ellipsoids: WGS84 (GPS standard), GRS80 (NAD83/ETRS89), Hayford/International 1924, Bessel 1841, Clarke 1866 (NAD27), Airy 1830 (OSGB36), and a mean sphere. Uses Bowring's iterative algorithm (5 iterations) for ECEF→Geographic, accurate to nanometer level. ENU mode computes relative position of a target point in the local tangent plane from a reference origin. Includes explanations of ellipsoidal vs. orthometric height and geoid undulation. All calculations are browser-based - no data is sent to any server.

How to Use

  1. 1Select the conversion mode: Geographic→ECEF, ECEF→Geographic, or Geographic→ENU
  2. 2Choose the reference ellipsoid (default: WGS84)
  3. 3Enter the input coordinates and read the results instantly
  4. 4For ENU: set a reference origin point and target point
  5. 5Click any result value to copy it
  6. 6Read the info panel for explanations of each coordinate system

Features

  • Geographic ↔ ECEF ↔ ENU conversions
  • 7 reference ellipsoids including WGS84 & GRS80
  • Bowring iterative algorithm (nanometre accuracy)
  • ENU shows distance from origin
  • Ellipsoid parameters displayed
  • Click any result to copy
  • Works fully offline
  • 100% browser-based

Frequently Asked Questions

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