Calculating the eastern and western boundaries of a UTM is very straightforward.

## What is the Universal Transverse Mercator (UTM) Map Coordinate System?

Adopted by the U.S. Army in 1947, the Universal Transverse Mercator (UTM) is an international plane (rectangular) coordinate system for the map projection, Transverse Mercator, on which it is based.

Each zone extends 3 degrees east and west from its central meridian and are numbered consecutively west to east from the 180-degree meridian.

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Transverse Mercator projections may then be applied to each zone.

The Northern and Southern Hemispheres are separated by the Universal Transverse Mercator (UTM) convention. The northern hemisphere’s UTM zone is designated as UTM North, which is represented by a positive value. The UTM zone has a negative value in the Southern Hemisphere, and is therefore known as UTM South.

## Units for the Universal Transverse Mercator (UTM) Coordinate System

The distance in each zone is measured in meters. Distance in meters to the east are known as the easting and distance in meters to the north are known as the northing.

## Calculating the Boundaries of a UTM Zone

**Difficulty Level:** Easy ** Time Required: 1** minute

Here’s How:

- UTM zones are all 6 degrees wide and increase from west to east starting at the -180 degree mark.
- Calculate the eastern boundary of any UTM zone by multiplying the zone number by 6 and subtracting 180.
- Subtract 6 degrees to obtain the western boundary.
- Therefore to find the eastern boundary of UTM zone 11: Eastern boundary of zone 11 = (11 * 6) – 180 = -114 degrees.
- Western boundary of zone 11 = -114 – 6 = -120 degrees.

## References

*The Universal Transverse Mercator (UTM) Grid*. (n.d.). U.S. Geological Survey Publications Warehouse. https://pubs.usgs.gov/fs/2001/0077/report.pdf

*This post was originally published August 25, 2006 and has since been updated.*

This is well and good but how do you do it the other way? How do you calculate the boundaries of a UTM Zone given a UTM coordinate?

Eric, you can calculate max X and Y for a particular UTM zone, these numbers will be the same across all UTM zone, except non-standard ones. The results will also depend on which geo ellipsoid you are using.

To lookup zone, based on the geodetic coordinate, you can use this online tool:

http://www.apsalin.com/utm-zone-finder.aspx

Please clarify the question, what are you trying to find, what do you been under the boundaries – is it max/min values of X, Y?

Eric is asking how to determine the zone boundaries for a given UTM coordinate for which the zone number is unknown. This requires some math, considering the distortion of the projection at the equatorial and polar regions. All the basic equations you need are located here… rotate the pieces put the puzzle together – it’s good exercise for your brain!

http://www.uwgb.edu/dutchs/UsefulData/UTMFormulas.HTM

Note that there are some exceptions to the ‘all zones are 6 degrees’ rule, especially in northern Europe – check the map at http://whatutmzoneamiin.blogspot.com/ for more details.