Free Stem and Leaf Plot Maker

Order the values, separate their stem from the digit at the chosen leaf unit, and read each row using the key. With 7 | 2 = 72, the row "7 | 2 2 5 8" represents 72, 72, 75 and 78. Repeated leaves are repeated observations; count them separately.

A stem-and-leaf display can retain individual values at its chosen precision while showing their distribution. It does not preserve finer digits when leaves are rounded. A row with no leaves shows a gap in the represented range; compare the accepted count and key with your input before interpreting the shape.

Negative stems need their sign and unit: at leaf unit 1, −2 | 7 3 means −27 and −23. In a back-to-back plot, read each group from its side of the shared stem and use the key for that side. Replace the starter labels so the chart describes the data you actually entered.

Use this illustrative dataset, not real student results: 12 15 15 21 24 28 31 34. Select Single, Auto and split Off. Replace the title with "Illustrative Practice Scores", the subtitle with "Synthetic data — eight practice scores", and the unit with "points". Choose Slide for this example.

Auto resolves to leaf unit 1. Expect three rows: "1 | 2 5 5", "2 | 1 4 8" and "3 | 1 4", with the key "1 | 2 = 12 points". Enable Summary statistics: count 8, minimum 12, maximum 34, range 22, median 22.5, mean 22.5 and mode 15.

Turn Median and Mode on to inspect the marks. The 21 and 24 leaves are circled because they are the central pair; 22.5 is their average, not an extra leaf. Both 15 leaves are underlined. Download PNG with worksheet mode off and inspect the completed answer.

Turn Worksheet: blank leaves on and download a second PNG. It should contain blank leaf lines, the stems and key, and the eight values below, with no summary or answer marks. Turn the option off to restore the answer view. In this example both downloaded files are 1280×720; distinguish the files before sharing them.

The leaf unit controls the displayed precision. For 72, a unit of 1 gives stem 7 and leaf 2. For 0.31, a unit of 0.01 gives stem 3 and leaf 1. A unit of 10 or 100 can keep larger values from requiring an impractically long plot. Auto looks for the finest supported unit that produces no more than 20 stems; inspect the result rather than assuming every range will fit.

When accepted values have finer digits than the leaf unit, the leaves are rounded and the plot shows a note. At unit 0.1, −0.15 becomes −0 | 2, 0.15 becomes 0 | 2 and 1.26 becomes 1 | 3. Summary statistics use the accepted values before this leaf rounding, subject to the six-fractional-digit input limit; they may therefore differ from a calculation using only the displayed leaves.

Split stems when observations bunch up, and use back-to-back plots for two groups measured on the same scale. For long lists or a wide range, a histogram maker may communicate the distribution more clearly. The 500-value input cap is a limit, not a recommendation to squeeze that many leaves into a readable chart.