Free online statistics plot makers and calculators.
Calculate Q1, Q3, interquartile range, median, and Tukey outlier cutoffs from raw numeric data.
Paste one numeric column. The calculator sorts the values and calculates Q1, Q3, and IQR.
PNG, SVG, JPG, and JPEG export run locally.
Enter valid data to calculate results.
Paste a list of numbers and the calculator sorts the data, finds Q1 and Q3, then subtracts Q1 from Q3 to get the interquartile range.
IQR measures the spread of the middle half of a dataset. It is less affected by extreme values than the full range because it uses quartiles instead of only the minimum and maximum.
The calculator also shows Tukey lower and upper outlier cutoffs. Values outside Q1 - 1.5 IQR or Q3 + 1.5 IQR are listed as possible outliers.
Paste paired X/Y data and create a clean scatter plot.
Build a histogram and frequency table from raw values.
Create a box plot with quartiles, IQR, and Tukey outliers.
Get a trendline equation, Pearson r, R², and residuals.
Calculate Pearson r and R² from paired X/Y values.
Paste X/Y data, fit a line, and inspect residuals.
Find min, Q1, median, Q3, and max from raw values.
Group raw values into bins and create a frequency table.
Find Q1 and Q3, then subtract Q1 from Q3. The result is the interquartile range.
Yes. Paste one numeric column from a spreadsheet or a plain text list.
Yes. It shows Tukey lower and upper outlier cutoffs based on 1.5 times the IQR.
Yes. The IQR calculation and chart rendering run in your browser.