The most frequent issue that the researcher faces while conducting any research is to decide the sample size. How much sample size to take? How many respondents are enough to understand the problem being addressed in the research? It is a dilemma that everyone goes through. This research was conducted with the sole purpose of helping future researchers navigate the complexities of sample size determination for robust and reliable results. Although there are several research articles available on understanding the sample size. This paper adds to the literature by providing the principles and laws, and online calculators for sample size justification.