What is a UTM zone and how are they numbered?

UTM (Universal Transverse Mercator) divides the world into 60 vertical zones, each 6° of longitude wide, numbered 1 to 60 from west to east starting at 180°W. Zone 1 covers 180°W to 174°W, zone 32 covers 6°E to 12°E, and zone 60 covers 174°E to 180°E. Each zone is further divided into a northern and southern hemisphere half, giving 120 unique UTM coordinate systems in total.

What is an EPSG code and where is it used?

An EPSG code is a numeric identifier from the EPSG Geodetic Parameter Dataset (maintained by IOGP) that uniquely identifies a coordinate reference system (CRS). GIS software like QGIS, ArcGIS, GDAL, PostGIS, and Mapbox all use EPSG codes to define projections and perform accurate coordinate transformations. Using the correct code ensures both parties are using exactly the same spatial reference, preventing positional errors that can span hundreds of metres.

How do I find the EPSG code for a UTM zone?

For WGS 84 UTM zones, the EPSG code follows a simple pattern: Northern hemisphere zones use 32601–32660 (zone number added to 32600), and southern hemisphere zones use 32701–32760 (zone number added to 32700). For example, UTM zone 32 North = EPSG:32632, and UTM zone 18 South = EPSG:32718. This converter calculates the code instantly for any zone and hemisphere combination.

What is the difference between EPSG 326XX and EPSG 327XX?

EPSG codes starting with 326 are WGS 84 / UTM zone XX North — for the northern hemisphere. Codes starting with 327 are WGS 84 / UTM zone XX South — for the southern hemisphere. Always choose the correct hemisphere for your data location to avoid offsets of thousands of kilometres.

What does the PROJ.4 string mean and when do I use it?

A PROJ.4 string is a compact text description of a coordinate reference system used by the PROJ library, which underpins GDAL, QGIS, GRASS GIS, and many other tools. For UTM zone 32N it reads: "+proj=utm +zone=32 +datum=WGS84 +units=m +no_defs". The +south flag is added for southern hemisphere zones. Use PROJ strings when working with command-line tools like ogr2ogr or when your software accepts PROJ definitions rather than EPSG codes.

How do I use an EPSG code in QGIS?

In QGIS, open Project → Properties → CRS (or press Ctrl+Shift+P), then type the EPSG number in the Filter box (e.g. "32632"). QGIS will show matching CRS options; select your UTM zone and click OK. For individual layers, right-click the layer → Set CRS → Set Layer CRS. You can also reproject data via Vector → Data Management → Reproject Layer using the EPSG code as the target CRS.

How do I use an EPSG code in ArcGIS Pro?

In ArcGIS Pro, open Map Properties → Coordinate Systems, then search for the EPSG code or the CRS name like "WGS 84 / UTM zone 32N". Alternatively, when using the Project tool, set the Output Coordinate System to the UTM zone EPSG. ArcGIS accepts WKID numbers, which for WGS 84 UTM zones are the same as the EPSG code number (e.g. WKID 32632 = EPSG:32632).

What is the difference between WGS 84 UTM and NAD83 UTM?

WGS 84 (World Geodetic System 1984) is the global datum used by GPS and most international datasets — its UTM EPSG codes are 32601–32760. NAD83 (North American Datum 1983) is a regional datum used across North America — its UTM EPSG codes are 26901–26923 for the northern zones. For practical GIS work in North America, WGS 84 and NAD83 UTM differ by only centimetres to a few metres, but for high-precision survey work the difference matters. This converter focuses on WGS 84 UTM.

Which UTM zone is my location in?

To find your UTM zone, take your longitude in decimal degrees and apply the formula: zone = floor((longitude + 180) / 6) + 1. For example, London at 0° longitude gives zone 31 (UTM zone 31 North, EPSG:32631). New York at -74° gives zone 18 (UTM zone 18 North, EPSG:32618). Common exceptions exist near Norway and Svalbard where UTM zones are widened.

When should I use UTM coordinates instead of latitude/longitude?

Use UTM when you need to measure distances, areas, or perform geometric calculations. Latitude/longitude is an angular coordinate system — straight-line distance calculations require trigonometry and differ by latitude. UTM uses a Cartesian (flat) grid in metres, making Euclidean distance and area calculations straightforward. UTM is ideal for regional datasets (city to country scale), whereas geographic coordinates (EPSG:4326) are better for global datasets.

UTM Zone to EPSG Code — Free GIS Projection Converter

Select any UTM zone (1–60) and hemisphere to instantly get the EPSG code, full CRS name, and PROJ.4 string. Includes reverse lookup and a complete reference table for all 120 UTM coordinate systems.

Why You Need the Right EPSG Code for UTM Data

Coordinate reference systems (CRS) are the invisible backbone of every GIS project. When you load a dataset into QGIS, ArcGIS, PostGIS, or any GIS platform, the software must know which CRS the data is in. Choose the wrong one and your data could appear hundreds of kilometres from its true location — a critical error in infrastructure planning, environmental monitoring, or land surveying. The EPSG code is the standard identifier that removes all ambiguity.

UTM (Universal Transverse Mercator) is the most widely used projected coordinate system in GIS. It divides the Earth into 60 zones, each 6° wide, providing a flat Cartesian grid where distances can be measured directly in metres. The WGS 84 UTM family alone covers 120 zones — 60 for the northern hemisphere and 60 for the southern — each with a unique EPSG code.

Understanding the UTM to EPSG Code Pattern

For WGS 84 UTM zones, EPSG codes follow a predictable rule that makes conversion straightforward:

Northern hemisphere: EPSG = 32600 + zone number (zones 32601 to 32660)
Southern hemisphere: EPSG = 32700 + zone number (zones 32701 to 32760)

For example, UTM zone 32 North — which covers central Europe including Germany, Italy, and Scandinavia — is EPSG:32632. Zone 32 South, covering the same longitudes in the southern hemisphere, is EPSG:32732. The pattern holds for all 60 zones, making it simple to calculate mentally once you know the rule.

EPSG Codes for Common Regions

Region	UTM Zone	Hemisphere	EPSG Code	CRS Name
New York, USA	18	North	EPSG:32618	WGS 84 / UTM zone 18N
Los Angeles, USA	11	North	EPSG:32611	WGS 84 / UTM zone 11N
London, UK	30	North	EPSG:32630	WGS 84 / UTM zone 30N
Paris, France	31	North	EPSG:32631	WGS 84 / UTM zone 31N
Berlin, Germany	33	North	EPSG:32633	WGS 84 / UTM zone 33N
Sydney, Australia	56	South	EPSG:32756	WGS 84 / UTM zone 56S
São Paulo, Brazil	23	South	EPSG:32723	WGS 84 / UTM zone 23S
Cape Town, S. Africa	34	South	EPSG:32734	WGS 84 / UTM zone 34S
Tokyo, Japan	54	North	EPSG:32654	WGS 84 / UTM zone 54N
Mumbai, India	43	North	EPSG:32643	WGS 84 / UTM zone 43N

Using EPSG Codes in GIS Software

QGIS

In QGIS, set the project CRS via Project → Properties → CRS. Type the EPSG number in the filter box and select the matching UTM zone. To reproject a layer, use Vector → Data Management → Reproject Layer, setting the target CRS to your UTM EPSG code. QGIS also accepts EPSG codes when defining map canvas CRS and when saving files with specific projections.

ArcGIS Pro

In ArcGIS Pro, search for the CRS name (e.g. "WGS 1984 UTM Zone 32N") in the Coordinate System picker, or enter the WKID number — which is identical to the EPSG code for WGS 84 UTM zones. The Project geoprocessing tool accepts WKID/EPSG codes directly as the output coordinate system.

GDAL / ogr2ogr

Use the EPSG code directly in command-line reprojection: ogr2ogr -t_srs EPSG:32632 output.gpkg input.gpkg. GDAL accepts EPSG codes in the format EPSG:NNNNN for all standard coordinate systems.

PostGIS

PostGIS stores geometry with an SRID (Spatial Reference ID) matching the EPSG code. Use ST_Transform(geom, 32632) to reproject geometry to UTM zone 32 North, or specify the SRID when inserting data: ST_GeomFromText('POINT(6.5 51.2)', 32632).

Step-by-Step Guide

Step 1

Tool Opens with Zone 32 North Pre-Selected

The UTM to EPSG converter loads with UTM zone 32 North pre-selected, instantly showing EPSG:32632. The result card displays the full CRS name "WGS 84 / UTM zone 32N", the longitude band covered, datum, and unit information. No setup or account required.

Step 2

Select a UTM Zone from the Dropdown

Click the "UTM Zone (1–60)" dropdown to select any of the 60 UTM zones. The EPSG code updates immediately without a page reload. Each zone covers a 6° longitude band around the globe.

Step 3

Switch to Southern Hemisphere

Click the "↓ South" button to switch to the southern hemisphere. The EPSG code prefix changes from 326XX to 327XX — for example, UTM zone 32 South gives EPSG:32732. The prefix 326 always means northern hemisphere and 327 means southern hemisphere.

Step 4

EPSG Code Displayed Instantly

The result card shows the EPSG code in large, clear text alongside the full official CRS name. The longitude band, datum (WGS 84), and units (metres) are shown below. Three copy buttons let you copy the bare number, the EPSG: prefixed string, or the full CRS name in a single click.

Step 5

Copy Code or Name with One Click

Click "Copy EPSG:" to copy the full code like "EPSG:32632" directly to your clipboard. Click "Copy number" for just "32632" (useful for QGIS CRS search). Click "Copy name" for the full CRS name. The button turns green for 1.5 seconds to confirm the copy.

Step 6

Copy the PROJ.4 / PROJ String

Below the result card, the PROJ.4 string is shown in full — for example "+proj=utm +zone=32 +datum=WGS84 +units=m +no_defs". Click the "Copy" button to copy it for use in command-line GIS tools, GDAL/OGR, or any software that accepts PROJ strings.

Step 7

Reverse Lookup — Enter an EPSG Code

In the "EPSG Code → UTM Zone" section, type any UTM EPSG code (like 32718 or EPSG:32701) and press Enter or click "Lookup". The tool instantly tells you which UTM zone and hemisphere that code corresponds to.

Step 8

Apply Reverse Result to Converter

After a successful reverse lookup, click "Apply to converter ↑" to instantly update the forward converter with the looked-up zone and hemisphere. This syncs both sections and shows the full CRS details for the entered EPSG code.

Step 9

Open the Full 120-Zone Reference Table

Click "▼ Show all 120 UTM zones" to expand a scrollable table listing all 60 UTM zones with their longitude bands and both northern and southern EPSG codes. Click any EPSG code in the table to immediately load it in the converter. The currently selected zone is highlighted.

Step 10

Click Any Zone in the Table

Clicking a row in the reference table sets the zone selector to that zone. Clicking the blue EPSG code sets both zone and hemisphere to North; clicking the purple EPSG code sets both to South. This lets you browse and explore all UTM zones and copy their codes directly from the table.