This document outlines intake and output (I/O) calculations, including their purposes, procedures, documentation, and implications. The purposes are to ensure accurate record keeping, prevent fluid overload or dehydration, analyze fluid status trends, and contribute to assessments. The procedure involves using an I/O chart, assessing intake and output, implementing measurements and documentation, and determining balance. Positive balance means intake exceeds output while negative balance means the opposite. I/O calculations help determine a patient's fluid status and identify potential issues like dehydration or excess fluid.