UTM to Lat Long Converter
Convert UTM coordinates (zone, easting, northing) to latitude and longitude — and back. Free, WGS84, runs entirely in your browser.
UTM → Latitude / Longitude
Latitude / Longitude → UTM
In plain terms: got a UTM coordinate off a survey, a topo map, or a GIS export — something like 18N 585633 4512388 — and need normal lat/long for Google Maps or your app? Paste the four values in and you'll get decimal degrees back instantly. Going the other way works too: type a lat/long and it hands you the UTM zone, easting and northing.
It all happens in your browser, no upload, no sign-up. The math uses the standard WGS84 datum, so results line up with what surveying and GIS tools expect.
What Is UTM?
The Universal Transverse Mercator (UTM) system splits the Earth into 60 north–south zones, each 6° of longitude wide. Instead of angles, a location is given in metres: an easting (distance east within the zone, offset by 500,000 m so it's always positive) and a northing (distance from the equator). Because the units are metres, UTM is popular in surveying, GIS, forestry and military mapping where you need to measure real-world distances directly.
How to Convert UTM to Lat/Long
A full UTM coordinate needs four pieces of information: the zone number (1–60), the hemisphere (N or S), the easting and the northing. The converter applies the standard inverse Transverse Mercator formulas on the WGS84 ellipsoid to return decimal-degree latitude and longitude — the format used by web maps and geocoding APIs.
- Zone tells you the central meridian: longitude of central meridian = (zone − 1) × 6 − 180 + 3.
- Easting below 500,000 is west of the central meridian; above is east.
- Northing in the southern hemisphere carries a 10,000,000 m false offset, which the converter removes automatically.
Frequently Asked Questions
How do I convert UTM to latitude and longitude?
You need the zone number, the hemisphere (N or S), the easting and the northing. The converter above applies the standard Universal Transverse Mercator inverse formulas on the WGS84 ellipsoid to return decimal-degree latitude and longitude. Enter the four values and the result updates instantly.
What is a UTM coordinate?
UTM (Universal Transverse Mercator) divides the world into 60 zones, each 6° of longitude wide. Within a zone, a position is given as an easting (metres east of the zone's central meridian, offset by 500,000) and a northing (metres from the equator). It is widely used in surveying, military mapping and GIS because distances are in metres.
What UTM zone am I in?
Zone = floor((longitude + 180) / 6) + 1. For example, longitude −73.99° (New York) is in zone 18. The converter above also reports the zone automatically when you convert from latitude/longitude.
What is the letter after the UTM zone number?
That letter is the latitude band (C to X, skipping I and O), covering 8° of latitude each. Bands N and above are in the northern hemisphere; C to M are southern. Some systems only store N or S for the hemisphere instead of the full band letter.
How accurate is UTM to lat/long conversion?
The Transverse Mercator series used here is accurate to well under a metre anywhere inside a standard UTM zone, which is more than enough for mapping, GPS and surveying reference. Accuracy degrades only far outside a zone's normal longitude range.
Working with coordinates in code?
Once you have latitude and longitude, turn them into real addresses with the LatLng reverse geocoding API — 3,000 free requests per day.