UTM ↔ Lat/Long Converter
Convert between UTM coordinates and latitude/longitude instantly — free, private and accurate (WGS84). Zone is detected automatically.
Results appear here as you type — everything is converted right in your browser (WGS84 datum), nothing is uploaded.
Need this in the field — offline?
The free Land Surveyor app includes this converter plus 40+ professional tools: traverse adjustment, resection, curves, area, level book and CSV/DXF export — all working without internet.
What are UTM coordinates?
The Universal Transverse Mercator (UTM) system divides the world into 60 north–south zones, each 6° of longitude wide. Inside a zone, positions are written as an easting and northing in metres — which makes distance and area calculations far easier than working with degrees. That is why almost all field survey work, GPS data collection and mapping is done in UTM or a similar projected grid.
How the conversion works
This tool uses the standard Transverse Mercator projection formulas on the WGS84 ellipsoid (the datum used by GPS), via the well-known proj4 library:
- Lat/Long → UTM: the zone is computed from your longitude, then the geographic coordinates are projected to grid easting/northing.
- UTM → Lat/Long: the inverse projection converts zone + easting + northing back to geographic degrees.
- Southern-hemisphere northings use the standard 10,000,000 m false northing.
Frequently asked questions
How do I convert UTM coordinates to latitude and longitude?
Select "UTM → Lat/Long", enter the zone number (1–60), choose the hemisphere, then type the easting and northing in metres. The latitude and longitude appear instantly, calculated on the WGS84 datum.
Which UTM zone am I in?
UTM zones are 6° of longitude wide. The zone number is floor((longitude + 180) / 6) + 1. When you convert from latitude/longitude, this tool detects the zone automatically — for example Riyadh (46.72°E) falls in zone 38.
Is this converter accurate enough for survey work?
The conversion uses the proj4 library with the standard Transverse Mercator formulas on WGS84 — the same mathematics used by professional GIS software, with sub-millimetre numerical precision. For legal or cadastral work, always follow your local datum and projection standards.
Is my data uploaded anywhere?
No. All calculations run inside your browser using JavaScript. Coordinates you type never leave your device.
Can I use UTM conversion offline in the field?
Yes — the free Land Surveyor Android app by APPNEST includes this converter plus 40+ surveying tools (traverse, resection, curves, area, CSV/DXF export) that work fully offline.
More free tools: browse all APPNEST surveying tools.