Coordinate Tools — CRS Converters, Unit Converters and Projection Tools
A collection of instant coordinate and unit conversion tools for GIS, survey, and web mapping workflows. Convert between coordinate systems, reformat coordinate notation, and switch between measurement units — all in the browser with no data uploaded.
What are coordinate tools?
Coordinate tools convert between different ways of representing locations and measurements. In GIS, the same point on Earth can be expressed in many systems: WGS 84 latitude/longitude, UTM eastings and northings, Web Mercator X/Y in metres, degrees-minutes-seconds (DMS) notation, or decimal degrees.
Unit converters handle the numeric values that appear in GIS calculations: area (square metres, hectares, acres), length (metres, kilometres, miles, nautical miles), and angles (degrees, radians). These tools are essential when integrating data from different sources that use incompatible units or conventions.
All conversions happen instantly in the browser using well-established geodetic formulae. No data is sent to a server.
Common use cases
GIS data preparation
Convert field survey coordinates from DMS notation or UTM to decimal degrees before importing into a GIS dataset or database.
Web map development
Convert between WGS 84 latitude/longitude and Web Mercator (EPSG:3857) X/Y when working with tile services, Mapbox GL, or Leaflet.
Survey data integration
Translate bearings from compass notation to azimuth, or convert areas from local units (acres, hectares) to SI units for reporting.
GPS data processing
Convert GPS coordinates from DMS notation as displayed on a handheld receiver to decimal degrees for use in GIS software.
How to use
- 1
Choose the appropriate tool — select the converter that matches the coordinate system or unit you need to convert.
- 2
Enter your value — type or paste a coordinate, distance, area, or angle into the input field.
- 3
Copy the result — the converted value appears instantly. Use it directly in your GIS software, database, or application.
Frequently asked questions
What is the difference between WGS 84 and Web Mercator?
WGS 84 (EPSG:4326) is a geographic coordinate system that represents positions as latitude and longitude in degrees. Web Mercator (EPSG:3857) is a projected system that represents positions as X and Y values in metres, designed for web map tiles. Use the Web Mercator Converter to switch between them.
When should I use UTM instead of WGS 84?
Use UTM when you need accurate area and distance measurements in a local region. UTM divides the world into 60 zones and projects each zone onto a flat plane, minimising distortion within that zone. WGS 84 is best for global data storage and exchange.
What is the difference between decimal degrees and DMS?
Decimal degrees express latitude and longitude as a single number, e.g., 51.5074. DMS splits the same value into three parts: 51° 30' 26.64". GPS receivers often display DMS, while GIS software prefers decimal degrees.
Why would I convert angles to radians?
Mathematical functions in programming languages (sin, cos, atan2) operate in radians, not degrees. If you are writing GIS calculations in code, convert degree values to radians first before passing them to trigonometric functions.