Science, Tech, Math › Science Microliter Definition and Example It's equal to one cubic millimeter Share Flipboard Email Print TEK IMAGE / SCIENCE PHOTO LIBRARY / 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 October 02, 2019 While the liter is the standard metric unit of volume, it's much too large to use in certain laboratory situations. Other common units include the milliliter and microliter. Microliter Definition A microliter is a unit of volume equal to 1/1,000,000th of a liter (one-millionth). A microliter is one cubic millimeter. The symbol for microliter is μl or μL. 1 μL = 10-6 L = 10-3 mL. Alternate Spelling: microlitre Plurals: microliters, microlitres The microliter is a small volume, yet measurable in a typical laboratory. An example of when you might use microliter volumes would be in preparation of an electrophoresis sample, when isolating DNA, or during chemical purification. Microliters are measured and dispensed using micropipettes. Example: "My sample had a volume of 256 μL."