Coordinate Format Converter

In short Coordinate notations fall into two groups that behave completely differently, and confusing them is the usual reason data goes quietly wrong. Decimal degrees, degrees-minutes-seconds and degrees-decimal-minutes are three spellings of ONE number: converting between them is exact arithmetic and loses nothing at all. UTM, MGRS, geohash and plus codes are not spellings — they are projections or cell systems that snap a point onto a grid, so converting into one and back returns the centre of the cell that contained your point rather than the point itself. A five-character geohash is not a location, it is a box roughly 4.9 km across; an eleven-character plus code is an area about 2.8 m by 3.5 m. That is a property of the format, not a fault, but a coordinate quoted without its precision is the most common way GIS data is silently degraded. Two further traps are worth naming. Latitude runs to 90 and longitude to 180, so a value above 90 in the first position almost always means the pair has been entered the wrong way round. And a minus sign means exactly what S or W mean, so writing −51.5074° N is a contradiction that appears in a surprising amount of published data. Everything here is computed from the WGS84 ellipsoid in your browser, with no map service involved.