Overview
bng2latlong is a simple, free API that converts British National Grid (OSGB36) easting and northing coordinates into standard WGS84 latitude and longitude. It requires no API key and is perfect for working with UK-specific geographic data like Ordnance Survey maps. If you are building applications with UK location data, this API saves you from implementing the coordinate conversion math yourself.
Beginner Tip
Easting and northing are the two numbers in a British National Grid reference (e.g., 651409, 313177). Pass them as query parameters and you will get back a standard lat/long pair ready to use in Google Maps or Leaflet.
Measurement Record
What actually happened when we called this API from our own infrastructure. Every value below was recorded by the request, not copied from the provider's documentation.
- Request
- GET https://api.getthedata.com/bng2latlong/651409/313177
- Result
- HTTP 200 · application/json · 90 bytes
- Response time
- 252 ms (median of 3) · fastest 246 ms
- Transport
- TLSv1.3 · TLS_AES_256_GCM_SHA384 · certificate issued by Let's Encrypt
- Browser CORS
- Allowed — Access-Control-Allow-Origin: *
- Served by
- nginx/1.18.0 (Ubuntu)
- Recorded
- 2026-08-10
Fields Returned
Top-level fields present in the response we captured, with the type and value we actually received.
| Field | Type | Value received |
|---|---|---|
| status | string | ok |
| easting | integer | 651409 |
| northing | integer | 313177 |
| latitude | number | 52.65798 |
| longitude | number | 1.71604 |
Captured Response
Captured from a real request to https://api.getthedata.com/bng2latlong/651409/313177 on 2026-08-10. Long arrays and nested objects are truncated to keep the shape readable.
{
"status": "ok",
"easting": 651409,
"northing": 313177,
"latitude": 52.65798,
"longitude": 1.71604
} Field Reference
status Result status, either ok for a successful conversion or error if the input was invalid. easting The easting value that was passed in the request. northing The northing value that was passed in the request. latitude WGS84 latitude of the converted coordinate. longitude WGS84 longitude of the converted coordinate. Implementation Example
Calls a real endpoint of this API. Replace any placeholder credentials with your own key.
const url = "https://api.getthedata.com/bng2latlong/651409/313177";
const response = await fetch(url);
if (!response.ok) throw new Error(`Request failed: ${response.status}`);
const data = await response.json();
console.log(data); What Can You Build?
Note: These code examples are AI-generated and unverified. Always refer to the official API documentation for accurate usage.
Common Errors & Troubleshooting
Generated guidance based on this API's documentation, not observed by us. Treat it as a starting point and check against the provider's own error reference.
Measured Score Breakdown
Live HTTP request to the API endpoint
Fully tested on Aug 10, 2026
Technical Specifications
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