Statistics

Use the Stem and Leaf Plot Calculator to sort data, find stems and leaves, and generate a clear stem-and-leaf plot in seconds.

Use this Coefficient of Determination Calculator (R-squared) to quantify how well a model explains data variation. Get R² fast and interpret it.

Use a Correlation Coefficient Calculator to compute Pearson’s r from two data sets. Learn what the value means and how to interpret it.

Use a Linear Regression Calculator to find the best-fit line, then predict y for a new x. Includes slope, intercept, and R².

Use a Quadratic Regression Calculator to fit a parabola y = ax² + bx + c to your data, then predict values and assess fit quality.

Compute mean, median, mode, and range from your data in seconds. Learn the formulas and avoid common mistakes with clear examples.

Use a Geometric Mean Calculator to find the average growth rate across multiple values. Learn the formula, steps, and practical examples.

Use this Permutation Calculator to compute arrangements for any n items taken r at a time, including repeats when needed.

Use this Covariance Calculator to compute sample or population covariance from two data sets and interpret what the sign means.

Use a 5 Number Summary Calculator to find the minimum, Q1, median, Q3, and maximum. Great for box plots and data checks.