What is the difference between qualitative and quantitative data? Qualitative data is about the quality of a product or service. Quantitative data is about how much of that product or service is available. Qualitative data is specific. Quantitative data is subjective. Qualitative data can be used to measure qualities and characteristics. Quantitative data can be used to measure numerical facts. Qualitative data describes the kind of data being analyzed. Quantitative data describes how much data is being analyzed.