🗺️ Coordinate Converter
Convert between DD, DMS, DDM, and UTM — all four formats on one screen with live conversion
Convert GPS coordinates across all four major formats — Decimal Degrees (DD), Degrees-Minutes-Seconds (DMS), Degrees Decimal Minutes (DDM), and Universal Transverse Mercator (UTM) — on a single screen. Type in any format and all three others update simultaneously with no button click. UTM conversion covers both northern and southern hemispheres with band letters, and all calculations run client-side so your location data stays private.
Latitude
Longitude
📍 DD (Decimal Degrees)
📐 DMS
📏 DDM
🗺️ UTM
What Is the Coordinate Converter?
Coordinate Converter is a free, browser-based GPS coordinate tool that converts between the four most common geographic coordinate formats — Decimal Degrees (DD), Degrees-Minutes-Seconds (DMS), Degrees Decimal Minutes (DDM), and Universal Transverse Mercator (UTM) — all on a single screen. No downloads, no sign-ups, and all calculations run locally in your browser.
Key Features
- Four Formats, One Screen: DD, DMS, DDM, and UTM displayed simultaneously — no other free tool combines all four.
- Live, Buttonless Conversion: Type in any format and all others update instantly with a 250ms debounce. No "Convert" button needed.
- Full UTM Support: Both northern and southern hemisphere band letters (C through X), automatically computed from latitude and longitude.
- Input Tolerance: Accepts coordinates with various delimiters — degree symbols (° ′ ″), commas, spaces, or plain numbers.
- Quick Examples: One-click load coordinates for NYC, Sydney, London, Tokyo, and Cape Town.
📋 When to Use the Coordinate Converter
Use this tool when working with GPS devices that output DMS or DDM but you need decimal degrees for Google Maps, converting survey data from UTM to latitude/longitude for GIS software, geocaching where different platforms use different formats, or reading coordinates from scientific papers that use DMS notation and need them in a modern decimal format.
⚙️ How the Coordinate Converter Works
The converter uses standard WGS84 (World Geodetic System 1984) datum, the same reference system used by GPS satellites and Google Maps. DD/DMS/DDM conversions use straightforward sexagesimal arithmetic: dividing or multiplying by 60 as needed. UTM conversion uses the Transverse Mercator projection with WGS84 ellipsoid parameters (semi-major axis 6378137m, flattening 1/298.257223563). All computations happen in your browser — your coordinate data never leaves your device.
How to Use the Coordinate Converter
- Select your input format — click DD, DMS, DDM, or UTM at the top.
- Enter your coordinates — type latitude and longitude (or easting/northing for UTM) into the input fields.
- See all four formats — the output cards update live as you type.
- Copy any format — click 📋 Copy on any card to copy that format to your clipboard.
Frequently Asked Questions
What coordinate formats does this tool convert?
Decimal Degrees (DD like 40.7128°, -74.0060°), Degrees-Minutes-Seconds (DMS like 40°42′46″N 74°0′22″W), Degrees Decimal Minutes (DDM like 40°42.768′N 74°0.367′W), and UTM (like 18T 583934 4507204) — all four on one screen with live conversion.
How do I convert DD to DMS?
Enter your decimal degree coordinates in the DD tab, and DMS appears instantly. Formula: degrees = integer part of DD, minutes = integer of (decimal × 60), seconds = (decimal × 3600) mod 60. The N/S/E/W hemisphere letter is determined from the sign.
Does this converter support UTM band letters?
Yes. UTM band letters C through X (excluding I and O) are fully supported for both northern and southern hemispheres. The correct band letter is computed automatically from latitude when converting from DD/DMS/DDM to UTM.
How accurate is this coordinate converter?
DD and DMS/DDM maintain precision to 6 decimal places (~0.11m at the equator). UTM easting and northing are shown to 1-meter precision. All calculations use double-precision floating-point with the WGS84 ellipsoid parameters — the same datum used by GPS.
Can I paste coordinates from Google Maps?
Yes. Google Maps gives coordinates in DD format like 40.7128, -74.0060. Paste the latitude and longitude into the DD input fields to instantly see DMS, DDM, and UTM equivalents. The inputs accept commas, spaces, and degrees symbols as separators.
What datum does this converter use?
WGS84 (World Geodetic System 1984), the standard datum for GPS and online mapping services. If your coordinates use NAD27 or another datum, expect small offsets — typically up to 100 meters horizontally.