Converts UTM ↔ latitude/longitude on WGS 84 and the datums that share its ellipsoid (NAD83, ETRS89, GDA2020, SIRGAS 2000…), one point or a whole list pasted from Excel. It also shows the scale factor and the meridian convergence. Everything runs in your browser.
Accepts E N, name E N or E N height, separated by spaces, tabs or semicolons (pasting from Excel works). If N comes before E, we notice.
Decimal degrees (point or comma) or degrees/minutes/seconds, with or without the symbols. Without a letter, positive means North/East and negative South/West. Force a zone to work in an extended zone (a site straddling two zones). You can also click on the map.
Result
Type or paste coordinates above. The result shows up here instantly.
How the UTM conversion works
The UTM projection (Universal Transverse Mercator) splits the Earth into 60 zones, each 6° of longitude wide, numbered eastwards from 180°W. In every zone the central meridian (CM) has E = 500,000 m and a scale factor of 0.9996; in the southern hemisphere the equator has N = 10,000,000 m (false northing).
This converter uses the GRS80 ellipsoid (the one behind WGS 84, NAD83, ETRS89, GDA2020 and SIRGAS 2000 — the difference between them is far below a millimetre in the projection) and the 6th-order Krüger series used by geodetic software, accurate to better than a millimetre inside the zone. That is why it also works in an extended zone, a few degrees outside the natural one.
Scale factor (k): how much longer or shorter a distance on the UTM grid is than the same distance on the ellipsoid. Meridian convergence (γ): the angle between grid North (UTM) and true North at that point; true azimuth ≈ grid azimuth + γ.
FAQ
How do I find the UTM zone of a place?
Zone = integer part of (longitude + 180) ÷ 6, plus 1. E.g. longitude −73.99° (New York) → 106.01 ÷ 6 = 17.7 → zone 18 (CM −75°). In “Lat/Long → UTM” mode with the automatic zone, the calculator does it for you. This tool uses the standard 6° zones; the special zones of Norway (32V) and Svalbard (31X–37X) have to be chosen by hand.
Are WGS 84, NAD83, ETRS89 and SIRGAS 2000 the same?
They share (practically) the same ellipsoid, so the UTM formulas are identical. The datums themselves are not: NAD83, ETRS89, GDA2020 and SIRGAS 2000 are tied to their tectonic plates and today differ from WGS 84 by a few decimetres up to about 2 m. This tool converts the projection, not the datum: the result stays in the datum you typed. Older datums such as NAD27, ED50 or SAD69 use other ellipsoids and need a datum transformation first.
What is an extended zone?
When a property or a project straddles two zones, it is common to compute everything in a single zone, even with some points outside it, so the survey is not split into two systems. Just pick the zone in “Lat/Long → UTM” mode. The farther from the central meridian, the larger the scale factor (the distortion).
Does the northing start at 10,000,000 m in the southern hemisphere?
Yes. In the southern hemisphere a “false northing” of 10,000,000 m is added so N is never negative. In the northern hemisphere N counts from 0 at the equator — always check the hemisphere when a point is close to it.
Can I paste a list from Excel?
Yes. Copy the columns (name, E, N or latitude, longitude) and paste them into the box. Every line becomes a point. The result comes as a table you can copy back to Excel or download as CSV.