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All calculatorsMethodology

UTM Coordinate Converter

Convert UTM zone, easting and northing to WGS84 latitude and longitude, or latitude and longitude to UTM, with decimal degrees, DMS and a round-trip check.

Interactive calculator · Method COORDINATE-CONVERTER-1.0 · Last reviewed: 2026-11-04

Calculate your scenario

Uses the WGS84 ellipsoid (a = 6,378,137 m, f = 1/298.257223563) and the Krüger series for the Transverse Mercator projection with scale factor 0.9996, false easting 500,000 m and false northing 10,000,000 m in the southern hemisphere.

Your inputs

Try an example

Default worked example. Edit the inputs to calculate your scenario.

Default worked example

Latitude 40.712800°
Longitude -74.006000°
Latitude, longitude (DMS) 40° 42′ 46.08″ N, 74° 0′ 21.60″ W
UTM coordinates Zone 18N, 583959.37 m E, 4507351.00 m N
Round-trip difference 0.072 mm

WGS84 Transverse Mercator (k0 = 0.9996, central meridian -75°): zone 18N 583959.37 E 4507351.00 N ↔ 40.712800°, -74.006000°.

How to use the calculator

For UTM to lat/long, enter the zone number, hemisphere, easting and northing in meters. For the reverse, enter latitude and longitude in decimal degrees with south and west as negative numbers; the zone is chosen from the longitude.

What the result means

Zone 18N, 583,959.37 m E, 4,507,351.00 m N is 40.712800°N, 74.006000°W, in lower Manhattan, New York City; the back-projection agrees to well under a millimeter.

Formula and units

Uses the WGS84 ellipsoid (a = 6,378,137 m, f = 1/298.257223563) and the Krüger series for the Transverse Mercator projection with scale factor 0.9996, false easting 500,000 m and false northing 10,000,000 m in the southern hemisphere. Zone central meridian = 6 × zone − 183°. The result is projected back the other way and the difference is shown.

Worked examples

UTM 18N 583959.37 4507351 (New York City): UTM zone (UTM → lat/long): 18 zone; Easting (UTM → lat/long): 583959.37 m; Northing (UTM → lat/long): 4507351 m; Latitude, decimal degrees, south negative (lat/long → UTM): 40.7128 °; Longitude, decimal degrees, west negative (lat/long → UTM): -74.006 °; Conversion: utm; Hemisphere (UTM → lat/long): N.
Example result: Latitude: 40.712800°; Longitude: -74.006000°; Latitude, longitude (DMS): 40° 42′ 46.08″ N, 74° 0′ 21.60″ W; UTM coordinates: Zone 18N, 583959.37 m E, 4507351.00 m N; Round-trip difference: 0.072 mm.

33.8568°S 151.2153°E (Sydney) to UTM: UTM zone (UTM → lat/long): 18 zone; Easting (UTM → lat/long): 583959.37 m; Northing (UTM → lat/long): 4507351 m; Latitude, decimal degrees, south negative (lat/long → UTM): -33.8568 °; Longitude, decimal degrees, west negative (lat/long → UTM): 151.2153 °; Conversion: ll; Hemisphere (UTM → lat/long): N.
Example result: Latitude: -33.856800°; Longitude: 151.215300°; Latitude, longitude (DMS): 33° 51′ 24.48″ S, 151° 12′ 55.08″ E; UTM coordinates: Zone 56S, 334900.57 m E, 6252288.75 m N; Round-trip difference: 0.296 mm.

Limitations and common mistakes

WGS84 and UTM only. No datum shift is applied, so NAD27, ED50, OSGB36 or local grid coordinates will be off by up to hundreds of meters. Lat/long → UTM uses the standard 6° zone from longitude and ignores the Norway and Svalbard exceptions. Not for survey, legal boundary or navigation use.

Picking the wrong hemisphere. A southern-hemisphere northing read as northern lands thousands of kilometers away; the latitude band letter (for example “T”) is not the hemisphere.

Sources and assumptions

Method COORDINATE-CONVERTER-1.0; last formula review 2026-11-04. Sources and their supported claims. Calculation methodology.