Coordinate converter – lat/long, DMS, UTM and EPSG

Coordinates come in many shapes. A GPS shows 55.676098, 12.568337, a paper map says 55°40′34″N 12°34′06″E, a surveyor's drawing gives UTM 33U 347093 6172711, and a GIS layer uses a national grid such as EPSG:25832 or the British National Grid. The converter reads all of them. Choose what the input is in, type or paste one point per line, and every line is shown as decimal degrees, degrees-minutes-seconds, degrees and decimal minutes and UTM, each with a copy button. Enter an EPSG code under "Also convert to" to get a projected or national system too. The points appear on the map, so a swapped latitude and longitude is easy to spot, and clicking the map writes that point in the input system. A list of up to 1,000 lines can be downloaded as a CSV file with all formats.

How to use it

1. Choose the input system - latitude/longitude, UTM or an EPSG code - and type or paste one point per line.
2. Read the converted values below the input, or click on the map to convert that spot.
3. Optionally enter an EPSG code under "Also convert to" for a national grid or another datum.
4. Copy single values with their buttons, copy the share link, or download every line as CSV.

How accurate is it?

Formats are exact, datums are not

Switching between decimal degrees, degrees-minutes-seconds and UTM within WGS84 is pure mathematics and exact to well under a millimetre. Six decimals of a degree are about 11 cm on the ground and two decimals of an arc second about 30 cm, which is how the results are rounded. Moving between datums, for example from WGS84 to OSGB36 or NAD27, needs a transformation that is only an approximation; the page shows the accuracy EPSG states for it next to the code, such as 1 m for ETRS89 and 5 m for the British National Grid without its grid file.

WGS84, ETRS89 and NAD83 are not quite the same

The continents move. ETRS89 is fixed to Europe and NAD83 to North America, while WGS84 follows the Earth as a whole, so in 2026 they differ by roughly a metre. Like most web tools and GIS defaults, the converter treats them as equal, which is why the stated accuracy is about 1 m. For survey work at centimetre level use the national transformation service of your mapping agency.

UTM zones and bands

UTM divides the world into 60 zones of 6° longitude, each with its own transverse Mercator projection, false easting of 500,000 m and, south of the equator, false northing of 10,000,000 m. The converter picks the zone from the position and follows the standard exceptions for south-west Norway and Svalbard. The letter after the zone number is the latitude band; north of 84° and south of 80° UTM is not defined.

Good to know

Latitude first or longitude first?

Without N, S, E or W letters the converter reads latitude first, as Google Maps writes it. GeoJSON and many programs write longitude first; if your points land in the sea or the wrong continent, swap the two numbers. For projected systems the easting (x) comes first and the northing (y) second.

Decimal commas and separators

Numbers such as 55,6761 with a decimal comma work when the two coordinates are separated by a semicolon, a tab or a comma followed by a space. Write UTM as zone, easting and northing, for example 32U 691000 6176000, or 33 south 500000 4000000 for the southern hemisphere.

Wrong EPSG code, wrong place

A projected coordinate is only meaningful with the right code: the same numbers in UTM zone 32 and zone 33 lie 400 km apart. The converter warns when a point falls outside the area a coordinate system is made for and shows it on the map, which catches most wrong codes.