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    EPSG reference

    EPSG:20440 — Ain el Abd 1970 / UTM zone 40N

    Ain el Abd 1970 / UTM zone 40N (EPSG:20440) — a Projected (metres) system on the intl datum, used in Saudi Arabia. Parameters, proj4, WKT, accuracy ±0.1 m, plus a free c…

    At a glance

    EPSG
    20440
    Name
    Ain el Abd 1970 / UTM zone 40N
    Kind
    Projected (metres)
    Family
    Universal Transverse Mercator (UTM)
    Ellipsoid
    intl
    Accuracy
    ±0.1 m (vs PROJ)
    Countries
    Saudi Arabia
    Convert from this system now

    Area of use

    West54.00°
    South19.66°
    East55.67°
    North22.77°

    Projection parameters

    Projectionutm
    UTM zone40
    Ellipsoidintl
    Unitsm
    Helmert shift to WGS84-143,-236,7,0,0,0,0
    proj4
    +proj=utm +zone=40 +ellps=intl +units=m +no_defs +towgs84=-143,-236,7,0,0,0,0
    WKT (ESRI)
    PROJCS["Ain el Abd 1970 / UTM zone 40N",GEOGCS["GCS_Ain el Abd 1970 / UTM zone 40N",DATUM["D_International_1924",SPHEROID["International_1924",6378388,297],TOWGS84[-143,-236,7,0,0,0,0]],PRIMEM["Greenwich",0],UNIT["Degree",0.0174532925199433]],PROJECTION["Transverse_Mercator"],PARAMETER["False_Easting",500000],PARAMETER["False_Northing",0],PARAMETER["Central_Meridian",57],PARAMETER["Scale_Factor",0.9996],PARAMETER["Latitude_Of_Origin",0],UNIT["Meter",1],AUTHORITY["EPSG","20440"]]

    Sample conversion

    Centre of the area of use: WGS84 54.83500, 21.21500 → EPSG:20440 275287.317, 2347464.556

    Values are within ±0.1 m at the test point.

    About the Universal Transverse Mercator (UTM) family

    Ain el Abd 1970 / UTM zone 40N is a Universal Transverse Mercator zone — a 6°-wide belt of the worldwide UTM system, in metres, centred on a meridian carefully chosen so distortion stays low across the zone. It is the everyday working grid for GPS-derived surveying in Saudi Arabia.

    The classic field mistake with UTM is using the wrong zone: a point one zone away is easily hundreds of kilometres off. Always confirm the zone number (and the hemisphere) before importing coordinates, and remember that UTM eastings are offset by a 500 km false easting so they never go negative.

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    FAQ

    What is EPSG:20440?
    It is the coordinate system “Ain el Abd 1970 / UTM zone 40N”, a Projected (metres) system in the Universal Transverse Mercator (UTM) family, identified worldwide by the code EPSG:20440.
    What datum does it use, and how accurate is it?
    It is based on the intl ellipsoid and it carries Helmert parameters to WGS84. The residual at the test point is about ±0.1 m versus PROJ; for centimetre work use a geodetic adjustment service.
    Where is this system used?
    It is used in Saudi Arabia. This page shows its area of use as a coordinate rectangle above.
    How do I convert EPSG:20440 to WGS84?
    Use the free coordinate converter above (preloaded with this system) to convert to WGS84, UTM, or any other system, within a ±0.1 m residual.

    You may also need: Arab-world coordinate converter · Surveying file format converter · Batch coordinate file converter