BYTETOOLS

UTM Coordinate Converter

Convert latitude and longitude to UTM zone, easting and northing on WGS-84 — and convert UTM grid references back to lat/long. Free and offline.

UTM here means Universal Transverse Mercator, the metric map-grid system used by surveyors, the military and topographic maps. It is unrelated to the utm_source campaign parameters used in marketing URLs.
18
Zone
T
Latitude band
583,959
Easting (m)
4,507,351
Northing (m)

UTM coordinate

18T 583959E 4507351N

Precise easting
583959.372 m
Precise northing
4507350.998 m
Central meridian
-75°

Datum WGS-84, scale factor 0.9996. The hemisphere is northern; southern-hemisphere northings include the 10,000,000 m false origin.

What is the UTM Coordinate Converter?

UTM here means Universal Transverse Mercator, the metre-based map grid used on topographic maps, by surveyors, by the military and throughout GIS.

  • Two-way conversion between WGS-84 lat/long and UTM easting/northing
  • Automatic zone selection including the Norway and Svalbard exceptions
  • MGRS-style latitude band letter alongside the zone number
  • Manual zone override for projects that cross a zone boundary
  • Warns clearly when a point falls outside the 80°S–84°N UTM range
  • 100% client-side — coordinates are never uploaded

How to use the UTM Coordinate Converter

  1. 1

    Pick the direction: latitude/longitude to UTM, or UTM back to latitude/longitude.

  2. 2

    For the forward conversion, enter the latitude and longitude and leave the zone on automatic.

  3. 3

    For the reverse, enter the zone number, hemisphere, easting and northing in metres.

  4. 4

    Copy the formatted grid reference or the decimal degrees pair.

About the UTM Coordinate Converter

UTM here means Universal Transverse Mercator, the metre-based map grid used on topographic maps, by surveyors, by the military and throughout GIS. This converter moves coordinates both ways: latitude/longitude to a zone, latitude band, easting and northing on the WGS-84 datum, and any UTM grid reference back to decimal degrees and DMS. It is not related to the utm_source campaign parameters used in marketing links.

The projection uses the standard Snyder series expansion with a 0.9996 scale factor, which is accurate to well under a millimetre inside a zone. Zone selection includes the two official exceptions — the widened zone 32 over south-west Norway and the shifted Svalbard zones — and you can override the zone manually when a project extends a neighbouring grid across a boundary.

Field crews, foresters, geologists, search-and-rescue teams and GIS analysts all need this conversion because UTM eastings and northings are plain metres: subtracting two of them gives a distance directly. Every calculation runs in your browser, so nothing about your site coordinates is uploaded.

Frequently asked questions

What is a UTM coordinate?

UTM divides the world into 60 north-south zones, each 6° of longitude wide, and projects each one flat on its own transverse Mercator. A position is then given as a zone number plus an easting and northing in metres, for example 18T 583960E 4507351N.

Is UTM the same as the utm_source tag in a URL?

No, and the collision confuses a lot of people. Universal Transverse Mercator is a map projection for physical locations. The utm_ parameters in web links stand for Urchin Tracking Module and are used for marketing campaign attribution — completely unrelated.

Why are UTM eastings always around 500,000?

Each zone's central meridian is assigned a false easting of 500,000 m so no coordinate is ever negative. A point west of the central meridian has an easting below 500,000 and one east of it has a higher value.

How do southern-hemisphere northings work?

The equator is given a false northing of 10,000,000 m in the southern hemisphere and northings count down from there. That is why a hemisphere flag is essential: the same easting/northing pair means two different places depending on N or S.

How accurate is this UTM conversion?

The series expansion used here is accurate to well under a millimetre anywhere inside a zone, on the WGS-84 ellipsoid. Accuracy degrades if you force a point into a distant zone, because the transverse Mercator distortion grows quickly beyond about 3° from the central meridian.

Why does my point say it is outside the UTM range?

UTM is only defined between 80°S and 84°N. Above and below that the Universal Polar Stereographic (UPS) grid is used instead, so the tool flags the result as an extrapolation rather than pretending it is a valid grid reference.

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