Convert Lat Long to UTM
Convert decimal latitude and longitude coordinates to Universal Transverse Mercator (UTM) format - free and instant.
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DD, DMS, UTM, MGRS, Plus Code, UN/LOCODE - converted instantly.
What is UTM (Universal Transverse Mercator)?
UTM is a metric coordinate system that divides the Earth into 60
zones, each 6° wide, and describes positions using meter-based
easting and northing values - for example,
30U 699375 5710148. Within each zone, the easting is
offset by 500,000m to stay positive, and the northing is offset by
10,000,000m in the southern hemisphere.
A UTM coordinate looks like 30U 699375 5710148, where
30U is the zone designator, 699375 is the
easting, and 5710148 is the northing. The metric basis
makes distance calculations trivial compared to working in degrees.
What is UTM used for?
- Surveying and engineering - measurements in meters translate directly to construction plans and CAD software
- Military operations - NATO forces use UTM as the foundation for the MGRS grid reference system
- GIS analysis - buffering, area calculation, and proximity queries are more accurate in a projected system
- Field research - ecologists, geologists, and archaeologists record sample locations in UTM for direct distance measurement
How do you determine the UTM zone?
The UTM zone for a given longitude is determined by a simple formula:
The latitude band letter (C through X, skipping I and O) is appended to form the full zone designator. Band C starts at 80°S and each band spans 8° of latitude, except band X which extends from 72°N to 84°N (12° wide).
There are notable exceptions: Norway (zone 32V is widened) and Svalbard (zones 32X, 34X, 36X are skipped in favour of 31X, 33X, 35X, 37X) have irregular zone boundaries to avoid splitting their territory across zone edges.
Worked example
Convert 51.5074°N, -0.1278°W (London) to UTM:
What are common UTM conversion mistakes?
Polar regions not covered. UTM only covers latitudes between 80°S and 84°N. Positions in Antarctica or the Arctic beyond these limits use the Universal Polar Stereographic (UPS) system instead. Attempting to convert polar coordinates to UTM will produce invalid results.
Zone boundary distortion. Points near the edge of a UTM zone have higher scale distortion than points near the central meridian. For cross-zone measurements, you should project both points into the same zone or use a different coordinate system entirely.
Lat/long order confusion. Geographic coordinates
use latitude-first order (51.5, -0.13), but some GIS
formats and databases store longitude first
(-0.13, 51.5). Swapping them silently shifts your
point to a completely different location.
Frequently asked questions
What is UTM coordinate format?
UTM (Universal Transverse Mercator) is a grid-based coordinate system that divides the Earth into 60 north-south zones, each 6 degrees of longitude wide. Locations are described using a zone designator (e.g., 18T), an easting (meters east), and a northing (meters north). Example: 18T 585630 4512345.
How many UTM zones are there?
There are 60 UTM zones, numbered 1 through 60, each spanning 6 degrees of longitude. Zone 1 starts at 180°W and zones increase eastward. Each zone is further divided into latitude bands labeled C through X (excluding I and O).
Why would I convert lat/long to UTM?
UTM coordinates are measured in meters, making distance and area calculations straightforward. They are preferred in surveying, military operations, engineering, and GIS analysis. If you need to share coordinates with field teams, plot positions on topographic maps, or perform spatial analysis, UTM is often more practical than decimal degrees.
What does the UTM zone letter mean?
The zone letter (e.g., the "T" in 18T) identifies the latitude band. Letters range from C (80°S–72°S) to X (72°N–84°N), skipping I and O to avoid confusion with the numbers 1 and 0. The letter helps identify which hemisphere and latitude range the coordinate falls in.