GPS Coordinate Converter
Convert coordinates simultaneously between Decimal Degrees (DD), Degrees Minutes Seconds (DMS), Degrees Decimal Minutes (DMM), UTM, MGRS, Geohash, and Plus Codes.
The GPS Coordinate Converter provides instant, deterministic bi-directional conversion between all standard geographic coordinate systems: Decimal Degrees (DD), Degrees Minutes Seconds (DMS), Degrees Decimal Minutes (DDM), Universal Transverse Mercator (UTM), Military Grid Reference System (MGRS), and Google Plus Codes (Open Location Code).
Source Coordinate Format
Universal Converted Formats
Calculated 100% OfflineCoordinate Converter Technical Specifications & Standards
WGS84 (EPSG:4326) / UTM Zones 1-60
Standard global ellipsoidal coordinate reference system
Angular Geodesics
Sub-millimeter conversion accuracy
GeoJSON · KML · CSV · SVG
Compatible with QGIS, ArcGIS, Google Earth & CAD
100% Client-Side
Calculations run in-browser. Zero coordinate logging.
How to Use the GPS Coordinate Converter
Follow this step-by-step procedure to execute precise spatial measurements and export results.
- 1Paste or type input coordinate: Enter any coordinate string in any format (e.g. "37° 46' 29\" N, 122° 25' 10\" W", "37.774929, -122.419416", "10SEG0000000000", or "849VQV88+8G").
- 2Automatic format detection: The parser automatically identifies the coordinate format, validates hemisphere boundaries, and parses values.
- 3Review converted formats: View all output representations formatted with standard precision and hemisphere indicators.
- 4Copy converted values: Click "Copy" next to any target format to place the normalized coordinate string onto your clipboard.
Geodesic Precision vs. Competitor Mapping Approaches
Most legacy mapping utilities (such as CalcMaps and FreeMapTools) rely on planar Web Mercator projections or spherical approximations, causing significant mathematical distortion at higher latitudes. GeoMap Suite computes exact ellipsoidal geodesics on the WGS84 reference ellipsoid.
| Calculation Model | Mathematical Basis | Distortion on WGS84 | Standard Tools | Practical Application |
|---|---|---|---|---|
| Planar (Web Mercator) | Cartesian dx² + dy² | 10% to 200%+ error | CalcMaps / Simple map tools | Distorts drastically away from equator. Inaccurate for true distance. |
| Spherical Great-Circle | Haversine (R = 6,371 km) | Up to 0.5% (~5 km/1,000 km) | Basic Google Maps wrappers | Ignores Earth's polar flattening. Reasonable for rough estimates. |
| GeoMap Suite Ellipsoidal | Karney Direct/Inverse WGS84 | < 15 nanometers (<0.0001%) | GeoMap Suite | Geodetic surveying, maritime, flight paths & legal boundary analysis. |
Worked Example 1: Converting DMS to Decimal Degrees and UTM
A mariner converts navigation coordinates "34° 03' 00\" N, 118° 15' 00\" W" to decimal and UTM for land mapping.
Input Parameters
- Input DMS
- 34° 03' 00" N, 118° 15' 00" W
- Target Datums
- WGS84 / UTM Zone 11S
Computed Outputs
- Decimal Degrees (DD)
- 34.050000, -118.250000
- UTM Grid
- Zone 11S 384652m E 3768521m N
- Degrees Decimal Minutes (DDM)
- 34° 03.000' N, 118° 15.000' W
Step-by-Step Mathematical Process
- Convert Latitude: 34 + (3 / 60) + (0 / 3600) = 34.050000° N (+34.050000).
- Convert Longitude: -(118 + (15 / 60) + (0 / 3600)) = -118.250000° W (-118.250000).
- Project to UTM Zone 11: Easting = 384,652 m, Northing = 3,768,521 m.
- Encode to MGRS: 11SMT8465268521.
Understanding Your Results & Practical Interpretation
Understanding UTM Zones & Central Meridians
Universal Transverse Mercator (UTM) divides the world into 60 longitudinal zones, each 6 degrees wide. Easting coordinates are measured in meters from a false easting of 500,000 meters to avoid negative values.
Practical Applications & Real-World Use Cases
GPS Device & CAD Data Preparation
Convert aviation DMS coordinates into decimal format for importing into GIS, AutoCAD, and drone flight controllers.
Mathematical Methodology & Geodetic Accuracy
Angular Conversion & Proj4 Conformal Projection
Conversion between angular spherical coordinates (DD, DMS, DDM) is performed deterministically. UTM conversions utilize standard Transverse Mercator projections referenced to the WGS84 ellipsoid.
DD = Degrees + (Minutes / 60) + (Seconds / 3600); Proj4.forward("EPSG:326XX", [lng, lat])Limitations & Boundary Conditions
- •UTM projections become distorted in polar regions beyond 84° N and 80° S (where UPS - Universal Polar Stereographic is standard).
Authoritative Reference Standards
Troubleshooting & Geographic Edge Cases
Why did my coordinate convert to the wrong hemisphere?
Ensure you include N/S and E/W hemisphere designators (e.g. "W" or a negative sign "-" for Western longitudes like the Americas).
Frequently Asked Questions
Divide the minutes by 60, divide the seconds by 3600, and add both to the degrees. For South latitudes or West longitudes, make the result negative.