Sample Size Calculator
Estimate sample size for a population proportion using confidence level and margin of error.
Enter your values
Use the fields below to calculate your result.
How to use this calculator
What to enter
Enter or select the following as requested: Confidence level; Expected proportion (%); Margin of error (%). Follow the units, valid ranges, examples, and options displayed beside each field.
What the result means
The statistical or model-evaluation result is computed from the supplied observations, labels, predictions, or parameter values using the metric named by the calculator. Check class definitions, positive/negative labels, averaging method, missing-data handling, and whether higher or lower values are desirable for this metric.
When to use it
Use this to evaluate data quality, model performance, or a statistical assumption. Interpret the metric alongside the dataset, baseline, class balance, and validation method rather than treating one score as proof of model quality.