To convert MGRS to DD: parse the grid zone designator, identify the 100km square from the two-letter identifier, compute absolute UTM easting and northing, then apply the inverse UTM projection.
MGRS to DD Converter
Could not parse that coordinate.
DD
Decimal Degrees
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DMS
Deg. Min. Sec.
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DDM
Deg. Decimal Min.
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UTM
Univ. Trans. Mercator
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MGRS
Military Grid
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Geohash
Base32
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Plus Code
Open Location Code
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How to Convert MGRS to DD: Step by Step
- 1 Parse the MGRS string into: Zone Number, Zone Letter, Column Letter, Row Letter, Easting digits, Northing digits.
- 2 Convert Column Letter to absolute easting using the column set for the zone.
- 3 Convert Row Letter to northing within a 2,000km cycle, then resolve the correct cycle using the zone letter.
- 4 Pad the numeric part to 5 digits each for 1m precision.
- 5 Apply the inverse UTM-to-latlong projection formula.
Worked Example
Input
31UDQ4825111943
Latitude conversion:
Zone 31U | DQ → Easting 448251, Northing 5411943 | Inverse UTM → 48.8584°N
Longitude conversion:
Inverse UTM → 2.2945°E
Result:
48.858400, 2.294500
Why Convert MGRS to DD?
MGRS is used on NATO military maps, US Army training materials, and defense contractor systems. Converting to DD is needed to use the location in civilian GPS apps or mapping software.
Common Mistakes to Avoid
- ✕ Incorrect 100km square resolution due to wrong cycle
- ✕ Confusing MGRS column and row letters
- ✕ Not padding the numeric portion to 5 digits each