Precise measurement of nucleic acid concentration is crucial for various applications such as transinfection, cloning, PCR, and next-generation sequencing (NGS). Achieving the specified target concentration is essential for optimal performance in these processes. Inaccurate quantification may introduce variability in downstream assays, impacting result quality. DNA and RNA quantification can be conducted through methods like UV absorbance through a spectrophotometer like Nanodrop, fluorescence measurement with nucleic acid-binding dyes, and qPCR. The appropriate DNA or RNA quantification method should be chosen based on many factors including availability of equipment, intended downstream application, and throughput. Some quantification methods have the added benefit of enabling determination of the biological and chemical purity of a sample. Caution should be used when comparing yields between methods as the presence of contaminants can lead to interference in measurements, resulting in over- or under-estimation of yield.