Coordinate Converter for DD, DMS, DDM, and UTM
The coordinate converter changes GPS coordinates between the formats used in mapping, navigation, and geographic work. Enter latitude and longitude in any common notation and see the same location written four ways at once: Decimal Degrees, Degrees Minutes Seconds, Degrees Decimal Minutes, and UTM.
It is built for geocachers swapping cache formats, hikers reading UTM off topographic maps, pilots and mariners working in DMS, surveyors and GIS users standardizing mixed sources, and anyone whose GPS device or app shows coordinates differently from the source they are reading.
How to Convert Coordinates
Enter latitude and longitude
Type Latitude and Longitude in any supported notation — DD, DMS, or DDM. The format is detected automatically, and you can even mix them (DMS for one field, decimal for the other).
Or switch to UTM input
Choose Switch to UTM input and enter the Zone (such as 18T), Easting, and Northing in meters. The latitude and longitude fields update to match.
Read every format at once
The All Formats panel fills in instantly with DD, DMS, DDM, and UTM for the same point. Each result is editable, so typing into one updates all the others and the map.
Copy or pick from the map
Use the copy button on any result to send that format to your clipboard. Open Map Preview to see the marker and click anywhere on the map to grab coordinates for that spot, or tap My Location to fill in your current GPS position.
Features
Auto-Detect Input Format
Type coordinates in decimal, DMS, or DDM and the converter recognizes and parses them automatically — no need to pick the input format first.
Interactive Map Preview
Open an OpenStreetMap-based map that works worldwide. Click anywhere on it to instantly read the coordinates for that location.
My Location
Tap My Location to fill in your current position using your device's GPS, with high-accuracy mode requested for the best fix.
All Formats at Once
See the same point in Decimal Degrees, DMS, DDM, and UTM simultaneously, so you never convert one format at a time.
Editable Results
Every result field is editable. Type a value into the DMS or UTM box and the other formats, the inputs, and the map all update to match.
One-Click Copy
Each result card has a copy button that places that exact format on your clipboard, ready to paste into GPS devices, maps, or documents.
UTM Conversion
Full UTM grid support both ways, including the special zone rules for Norway and Svalbard, computed on the WGS84 ellipsoid.
Flexible Input
Accepts degree symbols or plain spaces, single or double quotes for minutes and seconds, cardinal directions (N/S/E/W), or negative numbers.
Paste a Coordinate Pair
Paste "lat, lng" into a single field and it splits the pair for you. If a value above 90 lands in latitude, it is moved to longitude automatically.
Format Reference
A built-in reference panel explains each coordinate format, where it is typically used, and what it looks like in practice.
Frequently Asked Questions
How do I convert DMS to decimal degrees?
Type the DMS value — for example 40° 42′ 46.08″ N — into the latitude or longitude field and the Decimal Degrees result appears instantly. Internally the tool divides the minutes by 60 and the seconds by 3600, adds them to the degrees, then applies a minus sign for S or W.
How do I convert UTM to latitude and longitude?
Choose Switch to UTM input, then enter the Zone (such as 18T), Easting, and Northing. The latitude and longitude fields and the other formats update right away. You can also paste a full UTM string like 18T 583960 4507523 into the UTM result box.
What is the difference between DD, DMS, DDM, and UTM?
Decimal Degrees (DD) writes coordinates as plain decimals (40.7128°). DMS splits degrees into minutes and seconds (40° 42′ 46″). DDM uses degrees and decimal minutes (40° 42.768′). UTM is a grid system that divides the world into zones and measures position in meters. All represent the same place — only the notation changes.
What does a negative latitude or longitude mean?
A negative latitude is south of the equator (the same as adding an S), and a negative longitude is west of the Prime Meridian (the same as adding a W). You can use either negative numbers or N/S/E/W letters — the converter understands both.
How do I get the UTM zone for my coordinates?
Enter your latitude and longitude and read the zone at the start of the UTM result, such as 18T. The number is the longitude band and the letter is the latitude band; the tool also applies the special zone rules used around Norway and Svalbard.
Which coordinate format should I use?
It depends on the application. Most GPS apps and devices use Decimal Degrees; aviation and marine navigation usually use DMS; geocaching commonly uses DDM; and hiking, military, and survey work often prefer UTM. The built-in Format Reference panel summarizes each one.
How accurate are the conversions?
Conversions use the WGS84 datum, the standard behind GPS. Any small differences you see are display rounding, not conversion errors. For tighter precision, keep more decimal places in your input.
Why won't My Location work?
Your browser must be granted permission to access your location, and GPS works best outdoors with a clear view of the sky. On desktop computers the fix can be rougher because it relies on Wi-Fi positioning rather than a GPS chip. Your position stays on this page in every case.
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