Online Tool Store
Nightingale Rose Chart Generator
Turn a short list of labeled values into a polar-area coxcomb chart, with adjustable colors and a downloadable PNG. Runs entirely in your browser.
🔒 This tool runs entirely in your browser. Your files are never uploaded to a server.
One "label, value" pair per line, comma-separated. Example shown — replace it with your own data.
How it works
- Paste your data, one label and value per line, comma-separated.
- The chart redraws instantly, giving each category an equal-angle wedge sized by its value.
- Click Download PNG to save the chart as an image.
FAQ
What is a Nightingale rose chart?
Also called a coxcomb chart or polar area diagram, it plots each category as a wedge of equal angle around a circle, where the wedge's radius (not its angle) shows the value. Florence Nightingale famously used one to visualize causes of death in the Crimean War.
How is this different from a pie chart?
A pie chart varies the angle of each slice to represent its share of the total. A rose chart keeps every wedge the same angle and instead varies how far it extends from the center, which makes it easier to compare many categories at a glance.
What data format do I need?
One "label, value" pair per line, comma-separated. Values must be zero or positive — up to 20 rows.
How we compare
| Feature | Online Tool Store | Spreadsheet chart tool |
|---|---|---|
| Dedicated rose/coxcomb chart type | ✓ | ✗ |
| No sign-up, data stays in your browser | ✓ | Usually requires an account |
Most spreadsheet tools don't offer a rose chart type at all — this gets you one from a couple of pasted rows.