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Ó National Soil Resources Institute,            
Cranfield University, 2010


Work out a grid reference
Conversion of OS two-letter codes to numbers If you have a Grid Reference with two letters out the front, this is how to convert them to numbers.



EXAMPLE 1 - Letters and numbers to 6-figure (1km) grid reference

NS 306834 (This is a single point)
Split the numbers in half...
  • NS 306 834
  • 306 is the Easting, 834 is the Northing.
    Look up NS in the table, below...
  • NS = 26
  • 2 is the Easting, 6 is the Northing.
    Attach the number to the front of the appropriate value...
  • 2306 (Easting) 6834 (Northing)
    But, you would put into the interface only the 1st three values, as only 1km accuracy is required.
  • You would put 230 in the Easting field, and 683 in the Northing field.

    EXAMPLE 2 - 12 figure (1 meter) grid reference to 6-figure (1km) grid reference

    278456 456390 (This is another single point)
    This one is easier.
    We only need the first three numbers from the Easting and Northing.
  • In this case 278 is the Easting, and 456 is the Northing.

    If you have any problems, please call me, Timothy Farewell, the NSRI Data Lease Officer on (01234) 75 29 78, or e-mail me at nsridata@cranfield.ac.uk.

    OS letter codes to numbers conversion table

    Number (1)Letters (1)Number (2)Letters (2)Number (3)Letters (3)
    N02HL38NJ13SG
    N12HM48NK23SH
    N22HN7NL33SJ
    N32HO17NM43SK
    N42HP27NN12SM
    N01HQ37NO22SN
    N11HR47NP32SO
    N21HS6NQ42SP
    N31HT16NR1SQ
    N41HU26NS11SR
    N00HV36NT21SS
    N10HW46NU31ST
    N20HX15NW41SU
    N30HY25NX0SV
    N40HZ35NY10SW
    N52JL45NZ20SX
    N51JQ59OA30SY
    N50JV58OF40SZ
    9NA57OL54TA
    19NB56OQ64TB
    29NC55OV53TF
    39ND65OW63TG
    49NE14SB52TL
    8NF24SC62TM
    18NG34SD51TQ
    28NH44SE61TR
        50TV
          
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