Grid Reference UK - OSGB36

5K+
Downloads
Content rating
Everyone
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About this app

๐Ÿ—บ๏ธ UK Grid Tools โ€“ Grid Reference Finder, Postcode Finder & Coordinate Converter
The most accurate way to convert GPS coordinates into British National Grid References, OSGB36, and UK Postcodes โ€” online and offline.

๐Ÿ“ WHAT IT DOES
UK Grid Tools is a free, professional-grade app that helps you convert your current location (GPS / WGS84 / ETRS89) into:

- ๐Ÿ“Œ British National Grid Reference
- ๐Ÿ“Œ OSGB36 (15) coordinates
- ๐Ÿ“Œ UK Postcode (powered by postcodes.io + offline fallback)
- ๐Ÿ“Œ Shareable location formats for maps and messaging

Designed for surveyors, engineers, outdoor enthusiasts, GIS professionals, and anyone needing accurate UK location data โ€” the app ensures your coordinates are within 1 metre of accuracy.

๐Ÿง  WHY ITโ€™S ACCURATE
Most apps rely on an outdated 7-parameter Helmert transformation, which can introduce errors of 3โ€“10m or more across Great Britain.

UK Grid Tools uses the Ordnance Survey OSTN15 transformation model via a 20km grid implementation to achieve:

- โœ… <0.15m horizontal accuracy in 95% of the UK

- โœ… Fully compliant OSGB36(15) values

- โœ… True 10-figure Grid Reference precision

This makes it the most accurate grid reference finder available on Android today.

๐Ÿ“ซ POSTCODE FINDER (HYBRID ONLINE & OFFLINE)
We use the postcodes.io API to instantly retrieve your UK postcode from your GPS location. If you're offline, the app automatically uses a local fallback geocoder (where available) to still show a postcode โ€” making it great for use in the field.

๐ŸŒŸ TOP FEATURES

โœ… Convert GPS to Grid Reference, OSGB36, and Postcode
โœ… Highly accurate coordinate transformation with OSTN15
โœ… View coordinates in multiple formats
โœ… Works both online and offline
โœ… Uses postcodes.io for postcode lookup
โœ… Offline fallback geocoder when no internet is available
โœ… Customise the grid reference output (figures & separators)
โœ… Customise WGS84 display: DMS / DM / DD, signs or quadrants
โœ… Share your location via SMS, messaging apps, or clipboard
โœ… Open current location in maps with one tap
โœ… Tap & hold to copy values
โœ… Built-in GPS accuracy display
โœ… Manual coordinate input (Grid Ref, Easting/Northing, WGS84)
โœ… Card visibility settings โ€“ show only the details you care about
โœ… Light, dark, or system theme

๐Ÿ“ฑ DESIGNED FOR FIELD USE

- Extremely lightweight app (under 10MB)
- No ads, no tracking
- Works indoors, outdoors, or with partial signal
- Great for geocaching, hiking, planning, surveying, field work

๐Ÿš€ VERSION 2.1 โ€“ WHATโ€™S NEW

๐Ÿ“ฎ Postcode card added (auto + fallback)

๐Ÿงฉ Card visibility settings to declutter the interface

๐Ÿงช Performance improvements & accuracy tweaks

โœ… Full Material 3 UI refresh

๐Ÿ†“ Still 100% free, with no ads and no login

UK Grid Tools is ideal for anyone needing a reliable grid reference finder, accurate postcode lookup, or high-precision coordinate transformation between WGS84, OSGB36, and British National Grid References. Easily share location within a standard SMS size.

If youโ€™re looking for the most accurate UK Grid Reference app, with built-in postcode lookup and robust coordinate transformation, UK Grid Tools is the one to download.
Updated on
Apr 18, 2025

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
This app may share these data types with third parties
Location
No data collected
Learn more about how developers declare collection
Data is encrypted in transit

Whatโ€™s new

New features:

App now shows Postcode (UK only)
Card visibility added
Further configurations for WGS84 coordinates (show letter at the beginning or the end)
Reduced shared coordinates text size to fit a standard SMS (160 characters).
Other bug fixes and QoL improvements.

App support

About the developer
SURVEYOR.DEV LTD
support@surveyor.dev
12 Chadwick Walk Swinton MANCHESTER M27 4BY United Kingdom
+44 7586 826247