Stem and Leaf Plot Calculator

Enter your data set into the Stem and Leaf Plot Calculator and get a formatted stem-and-leaf plot (stemplot) instantly. Paste or type values separated by commas, spaces, or line breaks — the tool sorts them, splits them into stems and leaves, and displays the complete plot. Toggle split stems to divide each row into two (0–4 and 5–9), and choose your leaf unit (ones, tenths, or hundredths). Summary statistics — min, max, mean, median, mode, range, and count — are calculated alongside the plot.

Enter numbers separated by commas, spaces, or line breaks. Negative numbers are supported.

Tenths multiplies all values by 10; hundredths multiplies by 100.

Splits each stem row into two: one for leaves 0–4 and one for leaves 5–9.

Results

Data Count (n)

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Mean

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Median

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Mode

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Range

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Minimum

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Maximum

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Results Table

Frequently Asked Questions

What is a stem and leaf plot?

A stem and leaf plot (also called a stemplot or stem-and-leaf diagram) is a way to display quantitative data that preserves the original values while showing their distribution. Each number is split into a 'stem' (the leading digit(s)) and a 'leaf' (the trailing digit), and the data is arranged in rows. It works similarly to a histogram but retains the actual data values.

How do I read a stem and leaf plot?

Each row of the plot represents a stem (e.g., the tens digit). The numbers listed to the right of the stem are the leaves (e.g., the ones digit). To reconstruct a data value, combine the stem and leaf — for example, a stem of 3 and a leaf of 5 gives the value 35. A key or legend at the bottom explains the unit being used.

What does 'split stems' mean?

Split stems divide each stem row into two sub-rows: one displaying leaves 0–4 and another displaying leaves 5–9. This is useful when data is clustered and a standard plot produces overly crowded rows, making the distribution easier to see.

How does the leaf unit affect the plot?

The leaf unit determines which digit becomes the leaf. With 'Ones' as the leaf unit, the ones digit is the leaf. Selecting 'Tenths' multiplies all values by 10 so the tenths digit becomes the leaf, allowing you to work with decimal data. 'Hundredths' multiplies by 100 to capture two decimal places.

Does this calculator handle negative numbers?

Yes. Negative numbers are supported and will appear with a negative stem (e.g., –2 | 5 6 represents –25 and –26). They are sorted correctly and displayed separately from positive stems in the plot.

Can I use decimal numbers in the data set?

Decimals are supported when you change the leaf unit to 'Tenths' or 'Hundredths', which scales all values accordingly. If you use the 'Ones' leaf unit, decimal values are truncated to integers before plotting. Always check the key/legend to confirm the scale being applied.

What statistics are calculated alongside the plot?

The calculator provides count (n), mean, median, mode, range, minimum, and maximum for your data set. These descriptive statistics give a quick numerical summary to complement the visual distribution shown by the stemplot.

How many values can I enter?

You can enter any number of values separated by commas, spaces, or line breaks. For best readability in the plot, stem-and-leaf displays work most effectively with data sets of roughly 5 to 200 values. Very large data sets may produce a long table but all statistics will still be computed correctly.

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