MGRS to Lat/Long Converter

The MGRS to Lat/Long Converter turns Military Grid Reference System coordinates into decimal latitude and longitude — and back again — instantly, right in your browser. Type an MGRS string like 4QFJ12345678 and read off the matching decimal degrees, or paste a lat/long pair and get the grid reference. A live map updates as you go, so you can confirm the point is where you expect before you copy it.

MGRS is the grid system used by NATO militaries, search-and-rescue teams, wildland firefighters, and surveyors because it describes any spot on Earth with a single compact string. Decimal latitude and longitude is what nearly every consumer tool speaks — Google Maps, GPS units, drone flight planners, and GIS software. This tool bridges the two so you don’t have to do the UTM zone math by hand or trust a coordinate you can’t see on a map.

It’s free, requires no sign-up, and runs entirely on your device — coordinates you enter are never sent to a server. Use the single-coordinate mode for one-off lookups, or switch to bulk mode to convert a whole list and export the results as a CSV.

How to use the MGRS converter

1. Pick a direction. Type an MGRS reference into the MGRS box, or a lat, long pair into the decimal box. Whichever you fill, the other side and the map update automatically.
2. Set the precision. The precision selector controls how many digits the MGRS output carries — from a 100 km grid square down to 1 metre. Higher precision means a longer, more exact grid string.
3. Click the map. Don’t have a coordinate yet? Click anywhere on the map to drop a marker and read its MGRS and lat/long instantly.
4. Use your location. Tap “Use my location” to fill in your current GPS position (your browser will ask permission first).
5. Copy or open. Use the copy buttons to grab either value, or “Open in Google Maps” to view the point in a full map.
6. Convert in bulk. Switch to the Bulk tab, paste one coordinate per line (you can mix MGRS and lat/long freely), hit Convert, and export the whole table as CSV.

Frequently asked questions

What is MGRS?

MGRS — the Military Grid Reference System — is a geocoordinate standard built on the UTM/UPS projections. A reference like 18SUJ2348316801 combines a grid zone designator (18S), a 100 km square identifier (UJ), and an easting/northing pair. It pinpoints a location with one string instead of two signed decimal numbers, which is why field and military teams prefer it.

How do I convert MGRS to latitude and longitude?

Paste the MGRS string into the MGRS field above. The decimal latitude and longitude appear immediately in the box beside it, and the map flies to the point so you can confirm it. No zone lookups or manual UTM conversion needed.

Can I convert latitude/longitude back to MGRS?

Yes. Enter the coordinate as latitude, longitude (for example 38.88913, -77.05018) in the decimal field and the MGRS reference is generated instantly. Use the precision selector to control how many digits the grid string includes.

What does the MGRS precision setting mean?

Precision sets the size of the area the grid reference describes. A 100 km grid square is the coarsest; each step adds two digits and ten times more accuracy, down to 1 metre at the finest setting. For navigation you’ll usually want 10 metre or 1 metre precision.

What coordinate format should I type for lat/long?

Use decimal degrees separated by a comma: latitude first, then longitude, with negative values for south and west — for example -33.86880, 151.20930. The tool does not parse degrees-minutes-seconds; convert DMS to decimal first if that’s what you have.

Can I convert a list of coordinates at once?

Switch to the Bulk tab and paste one coordinate per line. You can mix MGRS and lat/long entries in the same list — the tool detects each format, converts it, and lets you download every result as a CSV file for use in a spreadsheet or GIS.

Is my coordinate data private?

Yes. All conversion runs locally in your browser. The coordinates you enter, your location, and the bulk lists you paste are never uploaded or stored on a server.

Is the tool free to use?

Completely free, with no account, no usage limits, and no watermark on exports.