Hlookup in Excel searches for a value in the top row of a table or an array of values, and then returns a value in the same column from a row you specify in the table or array.

• Select your data and sort it in ascending order
• Then type '=HLOOKUP(lookup_value,table_array,row_index_num,range_lookup)'.
  Lookup_value is the value to be found in the first row of the table. Lookup_value can be a value, a reference, or a text string. Table_array is a table of information in which data is looked up. Use a reference to a range or a range name. The values in the first row of table_array can be text, numbers, or logical values. If range_lookup is TRUE, the values in the first row of table_array must be placed in ascending order: ...-2, -1, 0, 1, 2,... , A-Z, FALSE, TRUE; otherwise, HLOOKUP may not give the correct value.
  If range_lookup is FALSE, table_array does not need to be sorted. Uppercase and lowercase text are equivalent. You can put values in ascending order, left to right, by selecting the values and then clicking Sort on the Data menu. Click Options in the sort dialog box, click Sort left to right, and then click OK. Under Sort by, click the row in the list, and then click Ascending.
  Row_index_num is the row number in table_array from which the matching value will be returned. A row_index_num of 1 returns the first row value in table_array, a row_index_num of 2 returns the second row value in table_array, and so on. If row_index_num is less than 1, HLOOKUP returns the #VALUE! error value; if row_index_num is greater than the number of rows on table_array, HLOOKUP returns the #REF! error value.
  Range_lookup is a logical value that specifies whether you want HLOOKUP to find an exact match or an approximate match. If TRUE or omitted, an approximate match is returned. In other words, if an exact match is not found, the next largest value that is less than lookup_value is returned. If FALSE, HLOOKUP will find an exact match. If one is not found, the error value #N/A is returned.
• If HLOOKUP can't find lookup_value, and range_lookup is TRUE, it uses the largest value that is less than lookup_value.
• If lookup_value is smaller than the smallest value in the first row of table_array, HLOOKUP returns the #N/A error value.
• If range_lookup is FALSE and lookup_value is text, you can use the wildcard characters, question mark (?) and asterisk (*), in lookup_value. A question mark matches any single character; an asterisk matches any sequence of characters. If you want to find an actual question mark or asterisk, type a tilde (~) before the character.
• In the example in the Excel training video the sorted data represents the density of water at different temperatures. The left most column gives the temperature in degrees and the top column specifies the 'decimal' degrees
• We looked up the density of water at 5.4 degrees celsius using the Hlookupfunction.