UTM to Decimal Degrees requires the inverse Transverse Mercator projection formula using WGS84 ellipsoid parameters. Enter your UTM zone, easting, and northing into the converter above for an instant result.
UTM to DD Converter
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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 UTM to DD: Step by Step
- 1 Identify the UTM zone number, zone letter, easting (meters), and northing (meters).
- 2 If the zone letter is south of N (C–M), subtract 10,000,000 from northing.
- 3 Subtract 500,000 from easting (remove false easting).
- 4 Apply the inverse Transverse Mercator formula using WGS84 constants (a=6378137, f=1/298.257).
- 5 This yields latitude and longitude in radians — convert to degrees by multiplying by 180/π.
Worked Example
Input
10T 550254 5272543
Latitude conversion:
Inverse TM projection → 47.6062°N
Longitude conversion:
Inverse TM projection → 122.3321°W
Result:
47.606200, -122.332100
Why Convert UTM to DD?
USGS topo maps, military maps, and surveying equipment output UTM. Most web mapping apps require decimal degrees, making this conversion essential.
Common Mistakes to Avoid
- ✕ Forgetting to subtract the 10,000,000 false northing for southern hemisphere
- ✕ Using the wrong zone number or letter
- ✕ Confusing UTM easting/northing with MGRS grid coordinates