Online Tool Store
Coordinate Projection Tool
Convert a geographic coordinate between decimal degrees, DMS, and an approximate UTM easting/northing projection.
🔒 This tool runs entirely in your browser. Your files are never uploaded to a server.
Example shown — Statue of Liberty, New York. Replace with your own coordinates.
How Coordinate Projection Tool works
- Enter a latitude and longitude in decimal degrees (the format GPS devices and most mapping sites use).
- The tool converts it to degrees-minutes-seconds (DMS) notation by splitting off the whole-degree and whole-minute parts, in real time as you type.
- It also computes an approximate UTM (Universal Transverse Mercator) projection — the zone number, hemisphere, and easting/northing in meters.
- All three representations update together, so you can copy whichever format the system you're working with expects.
Why three different formats exist
Decimal degrees are what GPS and web maps use internally. DMS is the traditional surveying and navigation notation, still common on nautical charts and older equipment. UTM projects the curved globe onto a flat grid in meters, which is what GIS software and many engineering/surveying workflows need for accurate distance and area calculations — degrees of longitude cover a different physical distance depending on latitude, while UTM meters don't have that distortion within a zone.
FAQ
How accurate is the UTM conversion?
It uses the standard Transverse Mercator series expansion (WGS84 ellipsoid), the same underlying math full geodetic libraries use — accurate to within a few meters for most points, which is well within tolerance for mapping, GIS import, or coordinate lookup use cases.
How is the UTM zone chosen?
UTM divides the globe into 60 zones, each 6° of longitude wide. The zone number is calculated as floor((longitude + 180) / 6) + 1, and the hemisphere letter (N or S) follows the sign of the latitude — the same rule used to build every UTM zone map.
Why do DMS seconds sometimes show a long decimal?
Decimal degrees are converted by taking the whole-number degree, then the whole-number minute from the remaining fraction, then whatever's left becomes seconds — a small rounding difference at the seconds level is normal and doesn't meaningfully change the location (0.01" is a few centimeters on the ground).
How we compare
| Feature | Online Tool Store | Computing the series expansion by hand | Full desktop GIS software |
|---|---|---|---|
| No file upload — runs in your browser | ✓ | N/A | ✗ |
| No sign-up required | ✓ | ✓ | ✗ |
| Free, no watermark | ✓ | ✓ | ✗ |
Full GIS software like QGIS handles far more than coordinate conversion, but it's overkill — and an install — for converting a single point. Coordinate Projection Tool runs the same Transverse Mercator math for one-off conversions, directly in your browser.