Code:
=IF(A1="";"0";SUMPRODUCT(POWER(36;LEN(A1)-ROW(INDIRECT("1:"&LEN(A1))));(CODE(UPPER(MID(A1;ROW(INDIRECT("1:"&LEN(A1)));1)))-48*(CODE(MID(A1;ROW(INDIRECT("1:"&LEN(A1)));
=IF(A1="";"0";SUMPRODUCT(POWER(36;LEN(A1)-ROW(INDIRECT("1:"&LEN(A1))));(CODE(UPPER(MID(A1;ROW(INDIRECT("1:"&LEN(A1)));1)))-48*(CODE(MID(A1;ROW(INDIRECT("1:"&LEN(A1)));
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