Statistics Calculators & Online Probability Tools
Find the mean, median, mode, standard deviation, p-value, z-score, probability and averages instantly! Save time with our statistics calculators—essential for exam prep, homework, teaching and research in math and data science.
Core Statistics & Probability Calculators
Average Calculator
Calculate arithmetic mean (average) of any data set—quick and accurate.
Mean Median Mode Calculator
Find all three central tendency values for lists, tables, grouped/un-grouped data.
Statistics Calculator
Analyze any dataset for mean, median, mode, quartiles, range, and more.
Standard Deviation Calculator
Get population/sample standard deviation, variance, step-by-step walkthrough.
P-value Calculator
Estimate statistical significance from z-score, t-score, or test statistics.
Z-score Calculator
Calculate z-score from mean, sd, value—normal distribution made easy.
Z-score & Probability Calculator
Get probability associated with any z-score in the standard normal curve.
Probability Between Two Z-scores
Estimate area/probability between two values—exam stats shortcut!