The Margin of Error Calculator estimates the uncertainty or possible deviation in a survey or sample estimate from the actual population value. Using the formula ME=Z×snME = Z \times \frac{s}{\sqrt{n}}ME=Z×n​s​, it multiplies the Z-score (which represents the confidence level) by the standard error of the sample mean. A smaller margin of error means greater precision, while a larger one indicates more variability in the sample data. This tool is commonly used in statistics, research, and opinion polls to determine how accurately a sample reflects the population.