There are provided a current sensing circuit and a memory device having the same. A current sensing circuit includes a current mirror unit suitable for outputting a first voltage and a second voltage; a chunk current controller suitable for generating the first voltage by generating a current through at least one page buffer; a fail bit counter suitable for adjusting a current at a first node where the first voltage is output in response to fail bits received from the page buffer; an allowed bit counter suitable for adjusting the current at the first node according to predetermined allowed bits; and a target range setting unit suitable for adjusting a current at a second node where the second voltage is output in response to a target code.