Histogram Maker
Paste numeric values and generate a histogram with automatic or custom binning, optional mean/median reference lines, summary statistics, and PNG download.
- ✓Sturges, square-root, or custom bins
- ✓Frequency or relative-frequency axis
- ✓Mean + median reference lines
Your histogram will appear here
Paste data on the left and click Generate
What is a histogram?
A histogram is a type of bar chart that shows the distribution of numerical data. Instead of comparing categories, a histogram groups numbers into ranges called bins and counts how many values fall into each range. The height of each bar represents the frequency (or relative frequency) of values in that bin.
Histograms are widely used in statistics to understand the shape of a distribution — whether data is roughly normal (bell-shaped), skewed left or right, bimodal (two peaks), or uniform. They are one of the first charts a data analyst creates when exploring a new dataset.
How to use this tool
- Paste your numbers into the data box — comma-separated or one per line.
- Choose a bin count method: Sturges (good for small datasets), √n (square root rule), or Custom.
- Select frequency (count) or relative frequency (percentage) for the y-axis.
- Optionally add a chart title and enable mean/median reference lines.
- Click Generate Histogram, then Download PNG to save the chart.
Bin count methods explained
Sturges' rule (default): k = ⌈1 + log₂(n)⌉. Works well for approximately normal data with n < 200.
Square root rule: k = ⌈√n⌉. Simpler and often used for larger datasets.
Custom: You choose the number of bins. Useful when you have domain knowledge about meaningful break points.
Use it for a focused statistical question.
The free tool is intentionally narrow. It is fastest when you already have numeric values and want one clear distribution view without building a full dataset workspace.
Histogram Maker questions
How the free browser tool behaves.
Does the Histogram Maker upload my pasted numbers?+
No. The free Histogram Maker processes the pasted values in browser JavaScript. The signed-in dataset workspace is a separate workflow for uploaded files.
Which bin method should I use?+
Sturges is a reasonable automatic starting point for many smaller datasets, the square-root rule is another quick heuristic, and Custom is useful when domain-specific breakpoints matter.
Can I download the histogram?+
Yes. After generating the chart you can download it as a PNG image.