Enter Your Data
Accepts numbers separated by commas, spaces, tabs, or newlines. Non-numeric values are ignored.
Your Histogram
📊 View Bin Data
| Range | Frequency | Percent |
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About Histograms
A histogram displays the frequency distribution of continuous data by grouping values into ranges called "bins." Unlike bar charts that compare categories, histograms reveal patterns in how data is distributed—whether clustered, spread out, symmetric, or skewed.
How to Use This Tool
- Enter your data — Paste or type numeric values separated by commas, spaces, or newlines
- Adjust the bins — Use the slider to change how many bins divide your data range
- Analyze the shape — Look at the distribution pattern and statistics
- Export — Download as PNG/SVG or copy the statistics
Choosing the Right Number of Bins
The number of bins significantly affects how your data appears:
- Too few bins — Hides important patterns and variations
- Too many bins — Creates noise and makes patterns hard to see
- Just right — Reveals the underlying distribution clearly
Common rules of thumb:
- Sturges' formula: bins = 1 + 3.322 × log(n) — good for normal distributions
- Square root: bins = √n — simple and works well for most data
- Rice's rule: bins = 2 × n^(1/3) — balances detail and smoothness
This tool defaults to 10 bins but lets you experiment to find what best reveals your data's story.
Understanding Distribution Shapes
- Normal (bell curve) — Symmetric, most values near the mean (test scores, heights)
- Skewed right — Long tail to the right, mean > median (income, home prices)
- Skewed left — Long tail to the left, mean < median (age at retirement, failure times)
- Bimodal — Two peaks, suggests two groups mixed together
- Uniform — Flat, all values equally likely (random numbers, lottery draws)
Histogram vs Bar Chart
Histograms and bar charts look similar but serve different purposes:
- Histograms show distributions of continuous numerical data (age, weight, time)
- Bar charts compare categorical data (countries, products, ratings)
- Histograms have adjacent bars (no gaps) because bins represent continuous ranges
- Bar charts have gaps between bars because categories are distinct
Statistical Measures Explained
- Mean — The average: sum of all values divided by count
- Median — The middle value when sorted (less affected by outliers)
- Standard Deviation — How spread out values are from the mean
- Min/Max — The smallest and largest values in your dataset
For a deeper dive into reading and interpreting histograms, see our guide: How to Read and Create Histograms.
Frequently Asked Questions
What is a histogram used for?
A histogram shows the frequency distribution of continuous numerical data by grouping values into bins. It reveals patterns like clustering, skewness, outliers, and gaps that summary statistics alone cannot show. Common uses include quality control, exam score analysis, scientific research, and financial analysis.
How is a histogram different from a bar chart?
Histograms display continuous numerical data with adjacent bars (no gaps) representing value ranges. Bar charts display categorical data with separated bars. In a histogram, the x-axis is a number line and bar order is fixed. In a bar chart, the x-axis has category labels and bars can be reordered.
How many bins should I use?
Start with the square root of your data count (√n). For 100 data points, try 10 bins. Then adjust: increase if the shape looks oversimplified, decrease if it looks noisy. Common formulas include Sturges' formula (1 + 3.322 × log n), square root (√n), and Rice's rule (2 × n^⅓). This tool defaults to 10 bins and lets you experiment with the slider.
What does a skewed histogram mean?
A right-skewed histogram has a long tail extending to the right — most values are low with a few very high values pulling the mean above the median. Income distributions are a classic example. A left-skewed histogram has a long tail to the left, with the mean pulled below the median.
What does a bimodal histogram indicate?
A bimodal histogram has two distinct peaks, suggesting the data contains two separate subgroups. For example, measuring heights in a mixed group of adults and children would produce two peaks. The overall mean is not representative of either group in this case.
Is this histogram generator free to use?
Yes. This histogram generator is completely free with no sign-up required. All calculations and rendering happen locally in your browser using SVG — no data is sent to any server. You can download the result as PNG or SVG.
Privacy & Limitations
- All calculations run entirely in your browser -- nothing is sent to any server.
- Results are estimates and may vary based on actual conditions.
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Histogram Generator FAQ
What is a histogram used for?
A histogram shows the frequency distribution of continuous numerical data by grouping values into bins. It reveals patterns like clustering, skewness, outliers, and gaps that summary statistics alone cannot show.
How is a histogram different from a bar chart?
Histograms display continuous numerical data with adjacent bars (no gaps) representing ranges. Bar charts display categorical data with separated bars. In a histogram the x-axis is a number line; in a bar chart the x-axis has category labels.
How many bins should a histogram have?
Start with the square root of your data count. For 100 data points, try 10 bins. Then adjust: increase if the shape looks oversimplified, decrease if it looks noisy. Common formulas include Sturges' (1 + 3.322 × log n), square root (√n), and Rice's rule (2 × n^⅓).
What does a skewed histogram mean?
A right-skewed histogram has a long tail to the right, meaning most values are low with a few very high values (e.g., income data). A left-skewed histogram has a long tail to the left. Skewness causes the mean and median to differ.
What does a bimodal histogram indicate?
A bimodal histogram has two distinct peaks, suggesting the data contains two separate subgroups. For example, a mixed dataset of two different populations may show two peaks. The overall mean is not representative of either group.
Is this histogram generator free to use?
Yes. This histogram generator is completely free with no sign-up required. All calculations happen in your browser — no data is sent to any server. You can download the result as PNG or SVG.