# Convert coordinates from Universal Transverse Mercator (UTM) to Geographic (latitude, longitude) coordinate system

See also to convert coordinates backwards:
Convert Geographic to UTM coordinates

### Universal Transverse Mercator (UTM)

UTM is conformal projection uses a 2-dimensional Cartesian coordinate system to give locations on the surface of the Earth. It is a horizontal position representation, i.e. it is used to identify locations on the Earth independently of vertical position, but differs from the traditional method of **latitude** and **longitude** in several respects.

The UTM system is not a single map projection. The system instead divides the Earth into sixty **zones**, each a six-degree **band of longitude**, and uses a secant transverse Mercator projection in each zone.

### Grid zone

The combination of a **zone** and a **latitude band** defines a grid zone. The zone is always written first, followed by the latitude band.

### Zone

The UTM system divides the Earth into 60 zones, each 6° of **longitude** in width.

### Latitude band

Each zone is segmented into 20 latitude bands. Each latitude band is 8° high, and is lettered from "C" to "X", omitting the letters "I" and "O".

### Grid zone exceptions

On the southwest coast of Norway, grid zone 32V (9° of longitude in width) is extended further west, and grid zone 31V (3° of longitude in width) is correspondingly shrunk to cover only open water.

In the region around Svalbard, the four grid zones 31X (9° of longitude in width), 33X (12° of longitude in width), 35X (12° of longitude in width), and 37X (9° of longitude in width) are extended to cover what would otherwise have been covered by the seven grid zones 31X to 37X.

All exceptions are considered.

### Datum (ellipsoid)

Ellipsoids describe the shape of the earth used to calculate the UTM grid. Available ellipsoids:

- Airy
- Australian National
- Bessel 1841
- Bessel 1841 Nambia
- Clarke 1866
- Clarke 1880
- Everest 1830 India
- Everest 1830 Malaysia
- Everest 1956 India
- Everest 1964 Malaysia and Singapore

- Everest 1969 Malaysia
- Everest Pakistan
- Fischer 1960 Mercury
- Fischer 1968
- GRS 1967
- GRS 1980
- Helmert 1906
- Hough
- Indonesian 1974
- International

- Krassovsky
- Modified Airy
- Modified Everest
- Modified Fischer 1960
- South American 1969
- WGS 60
- WGS 66
- WGS 72
- WGS 84

### Definitions

- DD
- Decimal degrees
- DDM
- Degrees decimal minutes
- DMS
- Degrees-minutes-seconds
- GARS
- Global Area Reference System
- GEOREF
- World Geographic Reference System
- UTM
- Universal Transverse Mercator
- USNG
- United States National Grid
- MGRS
- Military Grid Reference System

This page uses materials from the Wikipedia:
Universal Transverse Mercator coordinate system