Online Coordinate Converter — WGS84, UTM, MGRS, NAD83, BNG & State Plane

MGRS (Military Grid Reference System) encodes a location as a UTM zone number + latitude band letter (e.g. "18T"), a 100km grid square ID (two letters, e.g. "WL"), and an easting/northing pair truncated to the precision you need — 1km (2 digits each), 100m (3 digits), 10m (4 digits) or 1m (5 digits). "18T WL 80735 04695" reads as zone 18T, square WL, 80735m east / 04695m north within that square.

The world is divided into 60 UTM zones, each 6° of longitude wide, numbered 1 (180°W) to 60 (174°E). Enter any latitude/longitude in the "DD → DMS, UTM & MGRS" card above and the zone is calculated automatically along with the easting and northing in meters.

They're not identical, but for most non-survey-grade GIS work they're close enough to treat as equivalent — under 1–2 meters apart across the continental US. If you need true geodetic accuracy (engineering, legal surveys), use a proper datum transformation grid (e.g. NADCON) rather than assuming equivalence. This tool works in WGS84 — the same datum used by ArcGIS Online's REST API and GPS devices.

Latitude/longitude are angular coordinates (degrees) on the globe. Easting/northing are linear coordinates (meters) on a flat projected grid — UTM and Web Mercator both use easting/northing. They're not interchangeable between projections: a UTM easting/northing pair only makes sense together with its zone number, while a US State Plane easting/northing needs its specific state plane zone — pick it in the "Any CRS ↔ WGS84" card above.

WGS84 ↔ UTM ↔ MGRS conversions use the standard ellipsoidal transverse Mercator formulas and round-trip to sub-millimeter precision. Web Mercator (EPSG:3857) uses the spherical approximation, same as ArcGIS Online and most web maps — fine for visualization, not for survey-grade measurement.

Yes. The "AGOL format" row in each result gives you the longitude, latitude order GISGP and most Esri REST endpoints expect (outSR=4326). For pulling or filtering features from a live ArcGIS Online Feature Service by coordinate, see the Feature Count or Where Builder tools.

In the "Any CRS ↔ WGS84" card, set From = NAD83 (EPSG:4269) and To = WGS 84, then enter your longitude/latitude. For most GIS work the two datums differ by under ~1–2 m; this tool applies a Helmert transformation, not a NADCON grid shift, so use survey-grade tools if you need centimetre accuracy.

Use the "Any CRS ↔ WGS84" card: set From to your NAD83 State Plane zone (all ~120 zones are listed, in both metres and US survey feet), enter the easting and northing, and read the WGS84 latitude/longitude. Make sure you pick the correct zone and units — State Plane eastings/northings are only meaningful within their own zone.

Yes. The "Any CRS ↔ WGS84" card supports Singapore SVY21 (EPSG:3414), Philippines PRS92 zones (EPSG:3121–3125), East Africa Arc 1960 UTM and Canadian MTM zones, among others. Pick the system as the From CRS, enter the coordinates, and convert to WGS84 (or any other listed system).

Yes. In the "Any CRS ↔ WGS84" card, set From CRS to BGS2005 / CCS2005 (EPSG:7801) — Bulgaria's official national coordinate system, defined by Наредба № 8 (2010) — enter your X/Y in metres, and set To CRS to WGS84. Works both directions: also convert lat/lon back to BGS2005 X/Y for cadastral or kadastar.bg-style workflows.

In the "Any CRS ↔ WGS84" card, set From CRS to OSGB36 / British National Grid (EPSG:27700), enter your Easting and Northing in metres, and set To CRS to WGS84. The converter applies the standard 7-parameter Helmert shift (EPSG:1314), giving accuracy of approximately 1–4 m. For survey-grade accuracy, use the Ordnance Survey OSTN15 grid — not feasible in a browser tool.