Confidence Interval Calculator
Use our free Confidence Interval Calculator to estimate population means. Input sample size, mean, standard deviation, and confidence level for instant results.
normal distribution
Z Score Calculator
Free online Z-score calculator for statistical analysis. Calculate standard scores, convert to probabilities, and visualize normal distribution curves with detailed explanations.
P-value Calculator
Free online p-value calculator that converts z-scores to p-values. Essential tool for statistical hypothesis testing and determining significance in research data analysis.
Probability Calculator
Free online probability calculator for finding the likelihood of single or multiple events. Handles independent, mutually exclusive, and conditional probabilities with clear formulas and examples.