Free Online Coordinate Converter

Convert coordinates between Decimal Degrees, Degrees Minutes Seconds (DMS), Universal Transverse Mercator (UTM), and Military Grid Reference System (MGRS) — all in your browser. No upload, no server, complete privacy.

What this tool does

Convert coordinates between four common formats: Decimal Degrees (lat, lng), Degrees Minutes Seconds (DMS), UTM (easting, northing, zone), and MGRS (grid reference).

How to use

Enter coordinates in any supported format. All other formats update instantly. Copy the result you need with one click.

Supported formats

Decimal Degrees (e.g., 40.7128, -74.0060), DMS (e.g., 40°42'46"N, 74°00'21"W), UTM (e.g., 18T 583960 4507520), MGRS (e.g., 18TWL8396075200).

Privacy

Coordinates are processed locally in your browser. Nothing is sent to any server.

Use cases

Field data collection, GPS waypoint conversion, GIS data preparation, map reading, survey data reconciliation.

Accuracy

UTM and MGRS conversions use standard transverse Mercator formulas. Accuracy is within 1 meter for most locations.

Frequently Asked Questions

What coordinate formats are supported?

The converter supports Decimal Degrees, Degrees Minutes Seconds (DMS), UTM (Universal Transverse Mercator), and MGRS (Military Grid Reference System).

How do I convert GPS coordinates to UTM?

Enter your latitude and longitude in Decimal Degrees or DMS format. The UTM equivalent with zone, easting, and northing is calculated instantly.

What is MGRS?

MGRS (Military Grid Reference System) is a geocoordinate standard used by NATO. It divides the world into grid zones with lettered 100km squares and numeric easting/northing offsets.

Is my coordinate data stored or uploaded?

No. All conversion happens in your browser using JavaScript. Your coordinates never leave your device.

How accurate is the UTM conversion?

UTM conversions use standard transverse Mercator projections accurate to within 1 meter for most locations. Accuracy degrades slightly near zone boundaries.