Stem and Leaf Plot Calculator

A stem and leaf plot (also called a stemplot) is a statistical display that organizes numerical data by splitting each value into two parts: the 'stem' (all digits except the last) and the 'leaf' (the last digit). The stems are listed vertically in order, and the corresponding leaves are written next to each stem. This preserves the actual data values while revealing the overall distribution shape at a glance.

Each row shows a stem on the left and its leaves on the right, separated by a vertical bar. For example, '4 | 2 5 5 6 7' means the values 42, 45, 45, 46, and 47. A key at the bottom (e.g. '4 | 2 = 42') confirms the leaf unit being used. Count the leaves in any row to see how many values fall in that stem group.

Split stems divides each stem into two rows. The first row shows leaves 0–4 and the second row shows leaves 5–9 for the same stem value. This doubles the number of rows and gives a more detailed view of the data spread, which is especially useful when many values share the same stem.

The leaf unit determines which digit becomes the leaf. With 'Ones' selected (the default), the leaf is the units digit and the stem is everything to the left of it — suitable for whole numbers. Choosing 'Tenths' makes the first decimal place the leaf, useful for data like 2.3 or 14.7. Choosing 'Tens' treats the tens digit as the leaf, appropriate for large numbers like 100–999.

Yes. Negative values are sorted and plotted below zero stems. For example, –23 would have a stem of –2 and a leaf of 3. The plot lists negative stems in descending order (most negative first) and positive stems in ascending order, giving a complete picture of your data range.

The calculator handles datasets from as few as 2 values up to several hundred values. For very large datasets the plot can become tall, but all stems and leaves are displayed. For extremely large datasets (thousands of values), a histogram or frequency table may be a more practical visualization.

In addition to the stemplot itself, the calculator displays count (n), mean, median, mode, minimum, maximum, and range. These descriptive statistics give you a quick numerical summary to complement the visual distribution shown in the plot.

Both show the distribution of data, but a stem and leaf plot retains every individual data value while a histogram groups values into bins and shows only frequencies. This makes stemplots better for smaller datasets where preserving exact values matters, while histograms scale more efficiently to large datasets.