You want to use the function INDIRECT()
=INDIRECT(K1)
Please note this however: INDIRECT() is a volatile function, meaning that it will recalculating more often than necessary because of the uncertainty of the reference. For lighter workbooks this poses no problem. However, for more complex, heavier workbooks this can heavily slow the calculations. I have seen workbooks take 3-4+ minutes to open only to take ~5 seconds to open after eliminating all calls to INDIRECT().
