CNA Training Practice Test 2026 - Free Certified Nursing Assistant Exam Questions and Study Guide

When converting ounces to milliliters, use the approximate conversion that one fluid ounce equals about 29.57 mL, which is commonly rounded to 30 mL for quick calculations. So you multiply the number of ounces by 30 to get milliliters. This gives a reliable estimate for medication dosing in CNA tasks, since 30 mL per ounce is close to the exact value. If you needed exact math, you would use 29.57 mL per ounce, but 30 is the standard quick conversion. Numbers like 20, 60, or 15 would give results that are clearly too low or too high.