Science, Tech, Math › Science Calculating the Relative Standard Deviation Share Flipboard Email Print Relative standard deviation is standard deviation divided by the average. Jordan Lye / Getty Images Science Chemistry Chemical Laws Basics Molecules Periodic Table Projects & Experiments Scientific Method Biochemistry Physical Chemistry Medical Chemistry Chemistry In Everyday Life Famous Chemists Activities for Kids Abbreviations & Acronyms Biology Physics Geology Astronomy Weather & Climate By Anne Marie Helmenstine, Ph.D. Chemistry Expert Ph.D., Biomedical Sciences, University of Tennessee at Knoxville B.A., Physics and Mathematics, Hastings College Dr. Helmenstine holds a Ph.D. in biomedical sciences and is a science writer, educator, and consultant. She has taught science courses at the high school, college, and graduate levels. our editorial process Facebook Facebook Twitter Twitter Anne Marie Helmenstine, Ph.D. Updated January 30, 2019 Relative Standard Deviation Definition Relative standard deviation is a measure of precision in data analysis. Relative standard deviation is calculated by dividing the standard deviation of a series of values by the average of the values.