Lat Long to UTM Converter
Convert latitude and longitude into UTM zone, easting, and northing โ or go the other way and turn UTM coordinates back into decimal degrees, instantly.
Your converted coordinates will appear here.
What is UTM and why convert lat/long to UTM?
UTM, short for Universal Transverse Mercator, is a coordinate system that describes a location using meters instead of degrees. It divides the Earth's surface into 60 vertical zones, each spanning 6 degrees of longitude, and expresses a position within a zone as an easting (distance in meters east of the zone's reference line) and a northing (distance in meters from the equator). Unlike latitude and longitude, which measure angles on a curved surface, UTM behaves like a flat grid within each zone, so distances and areas can be calculated with ordinary geometry instead of spherical trigonometry.
This makes UTM the preferred system for surveying, hiking and backcountry navigation, forestry, engineering, and military coordination. A hiker with a paper topographic map and a UTM grid can plot a GPS position with a ruler and get a distance in meters directly, without first converting degrees of latitude into meters. This calculator converts a decimal-degree latitude and longitude into its UTM zone, easting, and northing, and can also reverse the process to turn UTM coordinates back into standard GPS-style coordinates.
How the lat/long to UTM conversion works
The calculator determines the correct UTM zone from your longitude, since each of the 60 zones covers exactly 6 degrees. It then applies the standard transverse Mercator projection formulas โ the same series developed by John P. Snyder and used throughout professional GIS and survey software โ using the WGS84 ellipsoid as the reference shape of the Earth. A scale factor of 0.9996 is applied at each zone's central meridian to keep distortion low across the width of the zone, and a false easting of 500,000 meters keeps every easting value positive.
In the Southern Hemisphere, a false northing of 10,000,000 meters is added so that northing values also stay positive, decreasing toward 10,000,000 as a point gets closer to the equator from the south. Together, the zone number, hemisphere, easting, and northing pinpoint a location to within a fraction of a meter under normal conditions, which is why UTM is trusted for professional and technical mapping work.
Worked example: converting a coordinate to UTM
Take the Empire State Building at latitude 40.748817ยฐ and longitude -73.985428ยฐ. The longitude falls inside UTM zone 18, and since the latitude is positive, the location is in the Northern Hemisphere. Running these coordinates through the transverse Mercator formulas gives an easting of approximately 585,651 meters and a northing of approximately 4,511,369 meters, commonly written as 18N 585651E 4511369N. Try this exact example using the "Empire State Building" chip above to see the full calculator output, including the copy-ready summary.
Converting UTM back to latitude and longitude
Going from UTM back to decimal degrees uses the inverse transverse Mercator series. The calculator needs four pieces of information: the zone number, the hemisphere, the easting, and the northing. Switch the direction toggle to UTM to Lat/Long, enter those four values, and the calculator returns the decimal-degree latitude and longitude along with a degrees-minutes-seconds version, so you can drop the result straight into a GPS device, a mapping app, or a spreadsheet.
Limitations and things to check before you rely on a result
UTM is built for the band of the Earth between 80ยฐS and 84ยฐN. Closer to the poles than that, the Universal Polar Stereographic (UPS) system is used instead, because UTM zones distort too much near the poles to stay useful. Norway and Svalbard also use a handful of irregular, widened UTM zones for local map consistency, which a general-purpose zone calculator like this one does not apply โ if you are working with Norwegian survey data, confirm the zone with your local mapping authority.
This tool uses the WGS84 datum, which matches standard GPS output almost exactly. If your project specifies a different datum, such as NAD83 for older US survey data, results can be off by roughly a meter or more depending on location, which matters for legal or survey-grade work but rarely matters for hiking, mapping, or general reference use.
Other useful converters for fieldwork and mapping
Coordinate conversion is often just one step in a bigger fieldwork or mapping task. If you're checking a printed topographic map that shows its UTM grid spacing in millimeters, the mm to inches converter can translate that grid spacing to inches for a US-printed map or ruler. Raw GPS data streams, such as NMEA sentences from a handheld receiver, often end each line with a hexadecimal checksum; if you need to decode one, the hex to decimal converter converts it to a plain decimal value in one step.
And if a UTM waypoint marks the start of a backcountry hike or survey trip, the lbs to stone converter is a handy way to double-check your pack weight before you head out, especially if you're working with a group that mixes pounds and stone for body or gear weight.
Lat Long to UTM Converter FAQs
What is UTM and how is it different from latitude and longitude?
UTM (Universal Transverse Mercator) is a coordinate system that measures location in meters instead of degrees. It divides the world into 60 numbered zones, each 6 degrees of longitude wide, and expresses a position as a zone number, a hemisphere, an easting (distance in meters from the zone's central meridian), and a northing (distance in meters from the equator). Latitude and longitude use angular degrees on a sphere, while UTM uses a flat, meter-based grid, which makes measuring straight-line distance and area much simpler within a single zone.
Which datum does this converter use?
This calculator uses the WGS84 ellipsoid, the same reference system used by GPS satellites and most modern mapping tools. WGS84 and NAD83 coordinates are nearly identical in North America, typically differing by around one meter or less, so results are suitable for most GPS, hiking, and mapping uses. For survey-grade or legal work, confirm the datum required by your local authority or agency.
Why does UTM easting start at 500,000 meters?
Each UTM zone uses a false easting of 500,000 meters at its central meridian so that every easting value within the zone stays positive, since real positions can fall either west or east of the meridian. A location exactly on the central meridian has an easting of 500,000. Points west of it are below 500,000, and points east of it are above 500,000, all within roughly a 180,000-meter range on either side.
Why does the northing value change between the Northern and Southern Hemisphere?
In the Northern Hemisphere, northing is measured in meters straight up from the equator, so it starts near 0 and increases toward the pole. In the Southern Hemisphere, a false northing of 10,000,000 meters is added to the equator value so that northing numbers also stay positive south of the equator, decreasing back toward 10,000,000 as you approach it from the south.
How accurate is this lat long to UTM conversion?
The calculator uses the standard Snyder transverse Mercator series used in professional GIS and survey software, which is accurate to a fraction of a meter within a normal UTM zone. Accuracy can decrease slightly very close to a zone boundary or at extreme latitudes, which is normal for any UTM-based tool and not specific to this calculator.
Can I convert UTM coordinates back to latitude and longitude?
Yes. Switch the direction toggle to UTM to Lat/Long, then enter the zone number, hemisphere, easting, and northing. The calculator applies the inverse transverse Mercator formulas to return the decimal degree latitude and longitude, along with a degrees-minutes-seconds version for reference.
Does UTM work everywhere on Earth, including the poles?
UTM covers the Earth between 80ยฐS and 84ยฐN. Locations closer to the poles use a separate system called Universal Polar Stereographic (UPS) instead, because UTM zones become too distorted that close to the poles. Norway and Svalbard also use a small number of irregular, widened zones for local mapping consistency, which this general-purpose calculator does not apply.
What is UTM commonly used for?
UTM is widely used in surveying, hiking and backcountry navigation, military coordination, forestry, and GIS mapping, largely because it lets you measure distance directly in meters without converting from degrees first. Many topographic maps print a UTM grid alongside latitude and longitude specifically so users can plot a position or measure distance with a ruler.
This tool is for educational purposes only. Always verify important results with a qualified professional.
