Histogram Maker: Turn Numbers into a Clear Distribution

Paste numeric values or load an example, then adjust the bins and check the counts. Download the chart as PNG or SVG, or save the frequency table as CSV. No account, payment or watermark is needed, so you can export results right away.

Copy one numeric column from Excel or Google Sheets into Raw data, or export the column as a CSV and import it. An optional header is accepted, and the limit is 10,000 observations. Native XLSX files are not supported, so paste the values or use a single-column CSV.

Choose Frequency table and enter each interval’s lower bound, upper bound and frequency on its own line. Intervals must be ordered and must not overlap, and frequencies must be non-negative whole numbers. Unequal widths automatically use frequency density. Grouped data cannot be rebinned because the original values are unknown.

Open the analysis panel to compare Sturges, square-root and Freedman–Diaconis previews on shared axes. Then apply a rule or enter a manual count or width. Automatic suggestions are capped at 60 bins. No bin rule proves normality or suits every dataset, so compare the patterns carefully.

Choose Relative frequency (%) in Chart settings for equal-width bins. Each bar shows the interval’s count divided by the total number of observations, multiplied by 100. Unequal grouped intervals use frequency density instead, so bar area still represents frequency. The bin table also includes percentages.

Download PNG at 1800 × 960 pixels, or SVG for resizing without losing sharpness. Both formats use a white background and have no watermark. You can also export the bin table as CSV, with interval boundaries, counts, percentages, cumulative counts and densities.

With at least four raw observations, the analysis panel flags values outside the 1.5 × IQR fences and keeps every value in the chart. It shows quartiles, fences and input positions. Flags suggest records to review; they are not proof of errors. Grouped frequency tables cannot identify individual outliers.

Copy or download calculation notes from the analysis panel. The notes record the chart settings, boundary rules, sample size, scale formula, descriptive statistics, outlier flags and the full bin table. Keep your original dataset separately, because the notes do not replace the source observations.