Although books and articles guiding the methods of sample size calculation for prevalence studies are available, authors observe several issues related to sample size calculation in published articles such as incorrect calculation, incorrect use of formula, incorrect parameters, and incomplete sample size reporting. This brief article focuses on sample size calculation for a prevalence study, choosing correct parameters with proper understanding, and reporting issues, and demonstrate use of a well-prepared calculator which also assist users to make proper decision making and appropriate report. Two calculators can be used with free software (spreadsheet and RStudio) which benefit researchers with limited resources. The calculators are available at: (https://sites.google.com/view/sr-ln/ssc)