To convert DD to UTM: determine the zone number (floor((lng+180)/6)+1), compute the central meridian, apply the Transverse Mercator projection with WGS84 parameters, add 500,000 to easting and 10,000,000 to northing for southern hemisphere.
DD to UTM 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 DD to UTM: Step by Step
- 1 Determine UTM zone number: floor((longitude + 180) / 6) + 1.
- 2 Calculate the central meridian of the zone: (zoneNumber - 1) × 6 - 180 + 3 degrees.
- 3 Convert latitude and longitude to radians.
- 4 Apply the Transverse Mercator projection formulas using WGS84 ellipsoid constants.
- 5 Add 500,000m false easting; if south of equator, add 10,000,000m false northing.
Worked Example
Input
47.606200, -122.332100
Latitude conversion:
Zone = floor((-122.332+180)/6)+1 = 10
Longitude conversion:
TM projection → Easting 550254, Northing 5272543
Result:
10T 550254 5272543
Why Convert DD to UTM?
Surveyors, topographic map makers, and GIS professionals need UTM for accurate distance measurements in meters. UTM avoids the distortion of simple lat/lng at small scales.
Common Mistakes to Avoid
- ✕ Using the wrong WGS84 constants
- ✕ Forgetting the false easting (500,000m)
- ✕ Not handling the special UTM zones in Norway and Svalbard