MakerBox

Coordinate Converter — WGS84, Korean TM (EPSG:5186), UTM

Convert between WGS84 lat/lon, Korean TM (EPSG:5185-5188), UTM-K 5179, UTM and legacy Bessel coordinates, with degrees to DMS and a map preview. Free.

Converts to

Korea 2000 Central Belt · EPSG:5186
Easting (X): 198091.706 · Northing (Y): 551885.022
Korea 2000 West Belt · EPSG:5185
Easting (X): 374794.637 · Northing (Y): 553725.113
Korea 2000 East Belt · EPSG:5187
Easting (X): 21388.172 · Northing (Y): 553806.384
Korea 2000 East Sea Belt · EPSG:5188
Easting (X): -155371.634 · Northing (Y): 559495.741
UTM-K unified (Naver/Kakao) · EPSG:5179
Easting (X): 953936.49 · Northing (Y): 1952031.885
UTM 52N (east Korea) · EPSG:32652
Easting (X): 321459.617 · Northing (Y): 4159639.881
UTM 51N (west Korea) · EPSG:32651
Easting (X): 851412.021 · Northing (Y): 4165164.21
Korea 1985 Central (Bessel, legacy) · EPSG:5174 · approximate (±1–2 m)
Easting (X): 198022.066 · Northing (Y): 451579.885

Height (orthometric ↔ ellipsoidal)

Ellipsoidal (GPS): 23.097 m · Geoid N = 23.097 m

The map is off until you open it; when open it loads OpenStreetMap tiles for the area around your point, so OpenStreetMap can see roughly where you are looking. The numbers you type are not sent.

🔒 Coordinates are converted in your browser — nothing is uploaded.

Convert coordinates between systems

Pick your input coordinate system, enter the values, and every other system is computed at once — copy any line. Supports WGS84 (GPS) longitude/latitude, the Korean 2000 Transverse-Mercator belts (EPSG:5185 West, 5186 Central, 5187 East, 5188 East Sea), the UTM-K unified grid (EPSG:5179, used by Naver and Kakao maps), UTM zones 51N/52N, and the legacy Korea 1985 Bessel central belt (EPSG:5174). Latitude/longitude also shows in degrees-minutes-seconds.

How accurate is it?

Conversions use proj4 with standard EPSG definitions, cross-checked against an independent Transverse-Mercator implementation for the Korean belts (agreement within 1 mm). Systems on the GRS80/WGS84 datum (5185–5188, 5179, UTM) are exact; the legacy Bessel belt (5174) uses a 7-parameter datum shift and is approximate to about ±1–2 m, since Korea officially uses an NTv2 grid for that transform.

Is anything uploaded?

No. All coordinate math runs locally in your browser. The map is off until you open it; when open it loads OpenStreetMap tiles for the area around your point, so OpenStreetMap can see roughly where you are looking. The numbers you type are not sent.

Frequently asked questions

Which coordinate systems are supported?

WGS84 lon/lat, Korean 2000 TM belts (EPSG:5185/5186/5187/5188), UTM-K unified (EPSG:5179), UTM 51N/52N (EPSG:32651/32652) and legacy Bessel EPSG:5174, plus degrees↔DMS.

What is EPSG:5186?

The Korea 2000 / Central Belt Transverse-Mercator system (central meridian 127°E) — the national grid most used for survey and construction in central Korea.

How accurate is the legacy Bessel (5174) conversion?

It uses a 7-parameter datum shift and is accurate to roughly ±1–2 m across the country; the modern GRS80 systems are exact.

Is anything uploaded?

No. All conversions run in your browser. The map is off until you press Show map; once open it loads OpenStreetMap tiles for the area around your point, so OpenStreetMap can see roughly where you are looking.