Statistics calculators & graph makers
Free statistics tools: box & whisker plots, scatter plots with a line of best fit, bell curves, and a grade curve calculator. Paste your data and download the chart.
Which tool do I need?
- Get the mean, standard deviation, and full summary of a data set — the standard deviation calculator shows every statistic and the step-by-step SD calculation.
- Summarize one data set's center and spread — the box & whisker plot maker gives the five-number summary, quartiles, and outliers.
- See how two variables relate — the scatter plot maker draws the plot with a line of best fit and its equation, R², and r.
- Find a probability under a normal distribution — the bell curve generator shades a region and reads off its probability and z-score.
- Curve a set of test scores — the grade curve calculator bumps, scales, or bell-curves grades and exports the result.
Every tool runs in your browser, takes pasted data straight from a spreadsheet, and exports the chart as PNG, SVG, or PDF (and the numbers as CSV). Nothing is uploaded.
Standard Deviation Calculator
Free standard deviation calculator with full descriptive statistics: paste your data for the mean, median, mode, range, variance and standard deviation (population and sample), quartiles, and outliers — with the standard-deviation steps shown. Download as CSV.
Box & Whisker Plot Maker
Free box and whisker plot maker: paste data, get the five-number summary, quartiles, and outliers, and download the plot as PNG, SVG, or PDF. Textbook or Excel quartiles.
Scatter Plot Maker (with Line of Best Fit)
Free scatter plot maker: paste your x and y data, get the plot with a line of best fit, the regression equation, R², and r. Download as PNG, SVG, PDF, or CSV.
Bell Curve Generator
Free bell curve generator: enter a mean and standard deviation to draw a normal distribution, shade any region, and read off the probability and z-score. Download as PNG, SVG, PDF, or CSV.
Grade Curve Calculator
Free grade curve calculator: paste a column of scores and curve them by a flat bump, top-score-to-100, a target average, or a bell curve. See every before/after grade and download the curved column as CSV.