What datum does this converter use?

All calculations use the WGS84 ellipsoid (semi-major axis 6,378,137 m, flattening 1/298.257223563) — the standard for GPS and modern mapping.

UTM divides the Earth into 60 vertical zones, each 6° wide, numbered 1–60 from west to east starting at 180° W. Each zone has a central meridian, a false easting of 500,000 m, and (for the Southern hemisphere) a false northing of 10,000,000 m.

How accurate is the conversion?

The implementation uses the full WGS84 Transverse Mercator series expansion. Accuracy is sub-millimeter in the interior of a zone and degrades slightly near zone boundaries — well within practical GPS accuracy.

How do I enter South or West coordinates?

Use negative numbers: −33.87 means 33.87°S, and −74.01 means 74.01°W. Decimal degrees are required; DMS entry is not supported.

Why does the easting differ for points in the same country?

Easting is measured from the central meridian of each UTM zone. Points near the western edge have eastings just above 100,000 m; those near the eastern edge approach 900,000 m. Different zones produce different eastings even for nearby points.

How do I convert UTM back to lat/long?

Use the companion UTM to Lat/Long Converter tool on this site for the reverse direction.

Latitude/Longitude to UTM Converter

Enter latitude and longitude in decimal degrees to instantly get the UTM zone, easting, and northing using WGS84.

Geographic Coordinates

Latitude (decimal degrees)

Range: −90 to 90 (negative = South)

Longitude (decimal degrees)

Range: −180 to 180 (negative = West)

Quick Examples

Need UTM → Lat/Long? Use the companion converter

Enter coordinates and click Convert to UTM to see the result.

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Summary

This tool converts decimal-degree latitude and longitude into Universal Transverse Mercator (UTM) coordinates using the WGS84 ellipsoid — the datum used by GPS. Enter a latitude and longitude and the converter computes the UTM zone, easting, and northing entirely in your browser; no data is sent to any server.

How it works

Type latitude in decimal degrees (range −90 to 90; negative = South).
Type longitude in decimal degrees (range −180 to 180; negative = West).
Click Convert — the UTM zone, easting, and northing are computed using the WGS84 Transverse Mercator formula.
Copy the result as a compact UTM string or open the original point in Google Maps.
Use Quick Examples to test with known landmarks.

Use cases

Convert GPS waypoints to UTM for GIS or survey software.
Cross-check field measurements against topographic map grid references.
Import lat/long from Google Maps into tools that require UTM input.
Validate GIS pipeline outputs against a reference implementation.
Education: understand how the WGS84 Transverse Mercator projection works.
Convert coordinates before uploading to military or engineering software.

Frequently Asked Questions

Last updated: 2026-05-29 · Reviewed by Nham Vu