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Travel, Maps & Coordinates

Great-circle Distance Calculator.

Coordinates, GeoJSON and preview data remain in this browser. Calculate shortest surface distance between coordinates using a selected Earth model. Uses explicit geospatial assumptions and independent local verification.

Use Great-circle Distance Calculator

Private in this browser. Coordinates and GeoJSON stay in this browser.

Tool options
Preparing the local tool…

How it works

  1. 01

    Enter coordinates or bounded GeoJSON.

  2. 02

    Run the local calculation, validation or preview.

  3. 03

    Review datum, order, precision and accuracy limits.

Frequently asked questions

Is this suitable for navigation or surveying?

No. It is a bounded planning calculation using the stated model and precision.

Does Great-circle Distance Calculator upload my data?

Great-circle Distance Calculator runs locally in your browser. Coordinates and GeoJSON stay in this browser.

What output does Great-circle Distance Calculator create?

Great-circle Distance Calculator creates Json output after the result passes its local verification checks.

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