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Home / Coordinate CSV converter / British National Grid (EPSG:27700) to WGS84 (EPSG:4326)
FREE BULK CSV WORKFLOW

Convert British National Grid coordinates to WGS84 in bulk

Convert British National Grid spreadsheet coordinates to GPS-ready longitude and latitude. Select the coordinate columns, keep your original attributes and export a clean CSV without installing desktop GIS software.

Open preconfigured converter →View instructions
Runs in your browserNo accountOriginal columns preserved
STEP BY STEP

How to convert the CSV

  1. Upload the source CSV
    Use a header row with separate X and Y coordinate columns.
  2. Map the coordinate columns
    Select easting/longitude as X and northing/latitude as Y.
  3. Verify the CRS pair
    The linked converter preselects British National Grid (EPSG:27700) and WGS84 (EPSG:4326).
  4. Preview, convert and download
    Inspect known points, keep or overwrite source columns, then export.
CSV EXAMPLE

Expected input and output

Column names can differ; you select them in the converter.

Input

id,easting,northing
1,530000,180000

Output

id,easting,northing,longitude,latitude
1,530000,180000,-0.12835,51.50399
ACCURACY CHECKLIST

Avoid the most common coordinate conversion errors

CheckWhy it mattersWhat to do
Axis orderLongitude/easting is normally X; latitude/northing is normally Y.Inspect a known record before processing the full file.
Source CRSThe same numbers produce a different location under a different CRS.Read the dataset metadata; never select a CRS only because the values look plausible.
Zone or regionUTM and national grids are region-specific.For OSGB36 eastings and northings in Great Britain.
PrecisionExtra decimal places do not improve inaccurate source coordinates.Choose decimals appropriate for the target CRS and intended use.
Operational note: For surveying, cadastral or safety-critical work, validate results against authoritative control points and the transformation rules required by the responsible authority.
WHY THIS WORKFLOW

Designed for real CSV data, not one coordinate at a time

BulkConverter preserves non-coordinate fields, previews the first records, flags invalid rows and lets you append output columns or overwrite the selected X/Y fields. This makes it practical for asset registers, field exports, address datasets and GIS handoffs.

Browse supported coordinate systems or use the single coordinate converter for a quick check.

How do I convert British National Grid (EPSG:27700) to WGS84 (EPSG:4326) in a CSV?

Upload the CSV, select the source X/Y columns, confirm British National Grid (EPSG:27700) as the source and WGS84 (EPSG:4326) as the target, then download the converted CSV.

Does the converter preserve my other columns?

Yes. Preserve original columns is enabled by default, so identifiers, names and attributes remain in the output.

Is my CSV uploaded to a server?

No. Coordinate parsing and transformation run in your browser. Your source file does not need to leave your device.

What should I check before converting?

Confirm axis order, source CRS, UTM zone or national grid, decimal separator and whether the first row contains headers. Preview several known locations before using the result operationally.

RELATED WORKFLOWS

More coordinate CSV conversions

WGS84 (EPSG:4326) → UTM zone 32N (EPSG:32632)
Choose the correct UTM zone for your dataUTM zone 32N (EPSG:32632) → WGS84 (EPSG:4326)
Confirm the UTM zone and hemisphere before convertingRD New (EPSG:28992) → WGS84 (EPSG:4326)
Built for Dutch Rijksdriehoeksstelsel datasetsWGS84 (EPSG:4326) → RD New (EPSG:28992)
For Dutch engineering, surveying and asset datasetsWeb Mercator (EPSG:3857) → WGS84 (EPSG:4326)
Useful for map tile and web GIS exportsWGS84 (EPSG:4326) → Web Mercator (EPSG:3857)
Prepare coordinates for common web mapping systemsLambert-93 (EPSG:2154) → WGS84 (EPSG:4326)
For projected coordinate datasets from mainland FranceBelgian Lambert 72 (EPSG:31370) → WGS84 (EPSG:4326)
For Belgian legacy engineering and government datasets
READY TO CONVERT?

Process the complete CSV in your browser.

Start with the preset, confirm the source CRS and inspect known records before export.

Open converter →