Convert Lat/Long to MGRS

Enter a decimal latitude and longitude to get the MGRS (Military Grid Reference System) grid reference, or paste a reference like 30U XC 99316 10163 to decode it back to decimal coordinates and UTM. MGRS divides the Earth into 6° by 8° grid zones and then into 100km squares and metric sub-grids down to 1 meter, so one short code identifies a precise square anywhere on the planet.

Enter coordinates above to see the MGRS reference.

How to use it

  1. Type the decimal latitude (for example 51.5074).
  2. Type the decimal longitude (for example -0.1278).
  3. Pick the precision you need; the MGRS reference and UTM coordinate update instantly.
  4. Copy the result with the Copy button.
  5. Going the other way? Flip the toggle to MGRS → Lat/Long and paste a reference at any precision, with or without spaces; the decimal coordinates and UTM appear instantly.

Do it live on the map

You can also search by any coordinate on the map (MGRS, UTM, GARS, Maidenhead, Plus Code, or plain lat/long) and fly straight to it. Right-click or long-press any spot to read it in all six systems at once, copy them, and reveal the nearest address.

Open the map

Frequently asked questions

How do I convert latitude and longitude to MGRS?

Enter the decimal latitude and longitude, then choose a precision level. The MGRS grid reference appears immediately; no button press needed.

How do I convert MGRS back to latitude and longitude?

Flip the toggle to MGRS → Lat/Long and paste the reference. The parser accepts any precision, from a 100km square to a full 1m location, with or without spaces.

What does an MGRS reference look like?

A Grid Zone Designator (such as 30U), a 100km square ID (two letters), then an even number of digits split between easting and northing. Spaces are optional.

What precision levels are available?

100km, 10km, 1km, 100m, 10m, and 1m. The default is 10m, which suits most planning work.

Is this converter free?

Personal and non-commercial use is free; commercial use needs a paid license. No login, no upload; the conversion runs entirely in your browser.

New to the system? Read how to read a military grid reference, or start from the map grid references guide.