Convert UTM to Lat Long
Convert Universal Transverse Mercator coordinates to decimal latitude and longitude - free, fast, and precise.
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DD, DMS, UTM, MGRS, Plus Code, UN/LOCODE - converted instantly.
What are UTM coordinates?
UTM coordinates describe a location using a zone designator, an
easting (meters east), and a northing (meters north) - for example,
18T 585630 4512345. The system divides the Earth into
60 zones, each 6° wide, with a 500,000m false easting and a
10,000,000m false northing in the southern hemisphere.
A UTM coordinate like 18T 585630 4512345 encodes the
zone designator (18T), the easting
(585630), and the northing (4512345). This
format is standard on topographic maps, in handheld GPS units, and
across GIS software.
Where are UTM coordinates used?
- Topographic maps - USGS quads, Ordnance Survey sheets, and most national mapping agencies overlay a UTM grid
- Handheld GPS - many Garmin and other field GPS units default to UTM output for waypoints
- GIS and spatial analysis - distance and area calculations are simpler in meters than degrees
- Search and rescue - ground teams report positions in UTM for direct distance estimation
How do you convert UTM to lat/long?
Converting UTM to latitude and longitude reverses the transverse Mercator projection. The high-level steps are:
The full equations involve the WGS 84 semi-major axis
(a = 6,378,137m), flattening
(f = 1/298.257223563), and iterative series terms.
This is impractical by hand, which is why a conversion tool is
essential.
Worked example
Convert 18T 585630 4512345 to decimal degrees:
What are common UTM to lat/long mistakes?
Missing hemisphere indicator. A bare northing like
4512345 is ambiguous without the zone letter or an
explicit N/S flag. In the southern hemisphere, the same northing
value represents a completely different latitude because of the
10,000,000m false northing offset.
Swapped easting and northing. Easting is always the smaller number (typically 100,000-899,999) and northing is the larger (up to ~9,300,000 in the northern hemisphere). Reversing them produces coordinates in the wrong location or an outright error.
Zone letter vs. hemisphere letter. Some systems
use 18N to mean "zone 18, northern hemisphere" rather
than the latitude band letter N (which covers 0°-8°N). This
overloaded notation is a common source of errors when exchanging
data between different software.
Frequently asked questions
What does a UTM coordinate look like?
A UTM coordinate consists of three parts: a zone designator (e.g., 18T), an easting value, and a northing value. For example, 18T 585630 4512345 means zone 18T, 585,630 meters east, and 4,512,345 meters north.
How do I read a UTM coordinate?
Read left to right: the zone designator tells you which part of the world, the easting tells you how far east within that zone, and the northing tells you how far north from the equator. The zone designator combines a zone number (1–60) with a latitude band letter (C–X).
Can I use UTM coordinates in Google Maps?
Google Maps does not accept UTM coordinates directly - it uses decimal degrees (latitude and longitude). You need to convert UTM to lat/long first. Paste your UTM coordinate into the converter above and copy the decimal degrees output.
How accurate is UTM to lat/long conversion?
The conversion is mathematically exact - no precision is lost. The accuracy of your result depends on the precision of your original UTM coordinates. A 1-meter UTM coordinate translates to roughly 0.00001° in decimal degrees.