Histogram Maker
Paste a list of numbers. Get a histogram and its frequency table, with bins you can set. Free, no sign-up.
Paste from a spreadsheet or CSV
First column: the labels. Each further column is a series (more than one makes a double or stacked bar graph). Copy cells straight from Excel or Google Sheets, or paste CSV. A header row names the series. You can also paste into any cell of the table.
One per line, or separated by spaces or commas. Paste a column straight from a spreadsheet.
Style
How to make a histogram
- Paste your numbers: a column from a spreadsheet, or a list separated by spaces or commas. Each number is one measurement (one student’s score, one person’s height).
- Leave the bin width on automatic, or set it. Bins of 10 for test scores out of 100, 5 cm for heights, are easy to read.
- Read the frequency table under the graph: counts, percentages, and running totals. Copy it as CSV for a spreadsheet.
Choosing the bin width
Too few bins and the shape disappears into two or three blocks; too many and every bar holds one or two values, so the outline turns jagged. Somewhere between 5 and 20 bars usually shows the shape. Try two or three widths: if the story changes from one to the next, there isn’t much data behind it.
Each bin includes its left edge but not its right, so with bins 70–80 and 80–90 a score of exactly 80 counts in 80–90. The bars touch because the bins cover a continuous number line with no gaps. How to read a histogram’s shape →