🧭 GPS Coordinate Converter (DD, DMS, UTM, MGRS, Geohash)
Enter a latitude and longitude in any format and get it in decimal degrees, DMS, DDM, UTM, MGRS and geohash — or decode a geohash back to coordinates.
Decimal degrees (DD)
51.507400, -0.127800
Degrees minutes seconds (DMS)
51°30'26.64"N 0°7'40.08"W
Degrees decimal minutes (DDM)
51°30.444'N 0°7.668'W
UTM
30U 699316 5710164
MGRS
30UXC 99316 10163
Geohash
gcpvj0duq53
Converts a WGS-84 location between decimal degrees, DMS, DDM, UTM, MGRS and geohash. UTM/MGRS use the Karney Transverse Mercator series (sub-millimetre) and are defined between 80°S and 84°N; geohash length 11 pins a spot to about a metre. Paste coordinates in any degree format (51.5074, 51°30′26″N, or 51 30 26 N) or switch to geohash to decode one. 🔒 All math runs in your browser — your location is never sent anywhere.
How the gps coordinate converter (dd, dms, utm, mgrs, geohash) works
Type a latitude and longitude (as decimal degrees like 51.5074, or DMS like 51°30′26″N, or degrees-decimal-minutes) and the tool shows the same point in every common format at once: decimal degrees, DMS, DDM, UTM, MGRS and geohash. UTM and MGRS use the Karney Transverse Mercator series on the WGS-84 ellipsoid — accurate to well under a millimetre — with correct grid zones including the Norway/Svalbard exceptions. Switch to geohash mode to decode a geohash string back to a point.
These formats all describe the same location in different languages: decimal degrees for software and maps, DMS for navigation and aviation, UTM/MGRS for surveying, the military and search-and-rescue, and geohash for databases and proximity lookups. UTM and MGRS are defined between 80°S and 84°N (the poles use UPS instead), and a geohash of length 11 pins a spot to roughly a metre. Everything is computed locally, which matters because a coordinate is a precise real-world location — often someone’s home or a field position.
Frequently asked questions
How do I convert latitude/longitude to UTM or MGRS?
Enter the lat/lon (in decimal degrees or DMS) and the tool outputs the UTM zone/easting/northing and the MGRS grid reference automatically, using the standard WGS-84 Transverse Mercator projection.
What’s the difference between DD, DMS and DDM?
They’re three ways to write the same angle. DD is a single decimal (51.5074°); DMS splits it into degrees, minutes and seconds (51°30′26″); DDM uses degrees and decimal minutes (51°30.44′). GPS software prefers DD; navigation and aviation often use DMS or DDM.
What is a geohash?
A short text string that encodes a latitude/longitude into a single token, where nearby places share a prefix — handy for databases and proximity searches. Longer geohashes are more precise; length 11 is about one metre. This tool encodes to and decodes from geohash.
How accurate is the UTM/MGRS conversion?
It uses Karney’s Transverse Mercator series, accurate to sub-millimetre across each zone — far beyond GPS precision. UTM/MGRS apply between 80°S and 84°N; beyond that the polar UPS system is used instead.
Is my location uploaded?
No — every conversion runs in your browser and works offline, so the coordinates you enter (which pinpoint a real place) never leave your device.