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Postal code distance calculator

Computes great-circle distances and initial bearings between postal codes from a bundled offline dataset, as bulk pairs or a full matrix.

Paste pairs or a code list to measure them.

Distances are great-circle: the shortest line over the Earth's surface, not a road or flight path. A postal code resolves to the dataset's representative point for the code, not an address, so a city-to-city figure can sit tens of kilometres from what a map route claims. Nothing is sent to a geocoder; lookups run against a bundled dataset in this tab. The bundled starter set carries a handful of sample rows per country, not the full GeoNames export, which the page credits under CC BY 4.0.
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