Convert RT90 to WGS84
Upload a KML, GPX, GeoJSON or CSV file with RT90 coordinates and download WGS84.
RT90 2.5 gon V (EPSG:3021) is Sweden's older national coordinate system, used until SWEREF99 TM became the standard. RT90 is still found in older maps, databases and GIS data, such as legacy municipal databases and older survey data from Lantmäteriet.
WGS84 (EPSG:4326) is the global standard for GPS, Google Maps and web mapping APIs. Upload your RT90 file, select RT90 as the source system and download the converted WGS84 file.
Typical RT90 2.5 gon V coordinates: X 6,580,000, Y 1,620,000 (central Sweden).
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Frequently Asked Questions
What is RT90?
RT90 (Rikets triangelnät 1990) is an older projected coordinate system for Sweden. RT90 2.5 gon V (EPSG:3021) was the most common variant. It has been officially replaced by SWEREF99 TM but still appears in legacy data.
How do I recognise RT90 coordinates?
RT90 2.5 gon V coordinates have X (northing) values around 6,100,000–7,700,000 and Y (easting) values around 1,200,000–1,900,000. The "1" prefix on Y values distinguishes them from SWEREF99 TM easting values.
What is the difference between RT90 and SWEREF99 TM?
Both are projected coordinate systems for Sweden in metres. SWEREF99 TM is newer, based on ETRS89 and more accurate for modern GPS-based work. RT90 is older and can differ by up to a few metres depending on location and transformation.
Can I convert RT90 to SWEREF99 TM instead of WGS84?
Yes. Select RT90 as the source system and SWEREF99 TM as the target system in settings. WGS84 and SWEREF99 TM are practically identical for most geodata purposes.