British National Grid Converter: Transform Coordinates Instantly
Convert between British National Grid coordinates and Latitude/Longitude with our free, easy-to-use tool. Whether you’re working with OS maps, planning outdoor activities, or need to convert coordinates for GIS applications, our converter provides instant, accurate results.
British National Grid Converter
Enter coordinates manually or click on the map to convert between formats.
Latitude/Longitude
British National Grid
How to Use Our Coordinate Converter
Map Click Method
- Zoom into your area of interest
- Click anywhere on the map
- See both coordinate formats instantly
- Drag the marker to fine-tune location
Manual Entry
- Enter your coordinates in either format:
- Latitude and Longitude (decimal degrees)
- British National Grid (easting and northing)
- Click “Convert” to see results
- View location on the interactive map
Understanding Coordinate Systems
British National Grid (OSGB36)
- Used on all Ordnance Survey maps
- Measures in meters from a fixed origin point
- Easting: distance east from origin (0-700,000)
- Northing: distance north from origin (0-1,300,000)
- Standard format for UK mapping and surveying
Latitude/Longitude (WGS84)
- Global coordinate system
- Used by GPS devices and online maps
- Measures in decimal degrees
- Latitude: -90 to +90 (north/south)
- Longitude: -180 to +180 (east/west)
Common Uses
Outdoor Activities
- Walking and hiking route planning
- Mountain biking trail coordinates
- Geocaching locations
- Running route mapping
Professional Applications
- Survey work
- Property boundaries
- Planning applications
- GIS data preparation
- Environmental studies
Navigation
- GPS waypoint conversion
- Route planning
- Location marking
- Meeting point coordination
Why Use Our Converter?
- Instant Results: Get conversions in real-time
- Interactive Map: Visual confirmation of locations
- Dual Input Methods: Map click or manual entry
- Mobile Friendly: Works on all devices
- No Installation: Use directly in your browser
- Free to Use: No registration required
Accuracy and Coverage
Our converter uses the official OSGB36 transformation parameters for maximum accuracy. Coverage includes:
- Great Britain mainland
- Major islands
- Surrounding waters
Tips for Accurate Conversions
- Double-check your input values
- Use decimal degrees for latitude/longitude
- Ensure coordinates are within UK coverage
- Verify location on the interactive map
- Use copy buttons for error-free transfer
Technical Information
- Uses EPSG:27700 (British National Grid)
- WGS84 (EPSG:4326) for lat/long
- Official transformation parameters
- Standard meter units for grid coordinates
[Tool Would Be Here]
Frequently Asked Questions
What accuracy can I expect?
Our converter uses official transformation parameters, providing accuracy suitable for most mapping and navigation purposes.
Why do my GPS coordinates differ slightly?
Small differences are normal due to the transformation between coordinate systems and the different datums used (OSGB36 vs WGS84).
Can I use this for Northern Ireland?
Northern Ireland uses a different grid system (Irish Grid). This converter is specifically for Great Britain.
How do I format my coordinates?
- Latitude/Longitude: Use decimal degrees (e.g., 51.5074, -0.1278)
- British National Grid: Enter easting and northing in meters
Need to convert multiple coordinates? Our tool makes it easy to quickly convert between British National Grid and Latitude/Longitude formats. Start by clicking the map or entering your coordinates above.
