This chapter talks about the formulas used in nursing practice. Surveillance rate calculation, temperature calculation, body surface area (BSA), height calculation, drug dosage, calculation of remaining oxygen in a cylinder, mean arterial pressure (MAP), epidemiological nursing, IV formula calculation, formula for fluid resuscitation among patients with burns, formula to calculate creatinine clearance, formula to calculate continuous infusions, and formula to calculate estimated blood volume are the basics formulas, which are used in nursing practice.