How the histogram tool and the step-by-step guides on this site are made, checked and kept up to date — and how to tell us when something looks wrong.
The guides and the histogram tool are produced by the Free Histogram Maker editorial team. Our focus is narrow on purpose: histograms, frequency distributions and the everyday software people use to build them. We are not affiliated with Microsoft, Google, the R Foundation, Texas Instruments, IBM SPSS, MathWorks or any other vendor named on this site; product names are used only to describe how their tools work.
Every tool guide is written against the current version of the software it describes, following the exact menus and functions step by step. When an interface changes — a renamed menu, a moved button — we update the affected guide. Code examples for R and Python are written to run as shown, and spreadsheet steps for Excel and Google Sheets are checked against their current chart tools. Where a result depends on a setting (such as bin width or bucket size), we explain the setting rather than leaving it implicit.
If you find a step that no longer matches what you see on screen, please tell us with the software version you are using and we will correct it.
The on-site histogram maker computes its statistics directly from your data in your browser. The mean, median, mode, quartiles, interquartile range and variance use standard textbook definitions; the standard deviation uses the sample formula (dividing by n−1); and skewness uses the adjusted Fisher–Pearson coefficient, the same definition as a spreadsheet’s SKEW function. Bins are built so that every value is counted exactly once, and the bin-count suggestions follow the square-root, Sturges and Rice rules. Nothing is estimated or randomly generated — the only sample data on the site is the clearly labeled “Load sample data” button.
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