About this visualization tool
Calculate and visualize Pearson correlation coefficients (r) between numeric variables in your CSV or Excel dataset with an interactive correlation matrix heatmap.
RJB World Visualization Tools
Correlation Matrix Visualizer
Calculate Pearson correlation coefficients ($r \in [-1, 1]$) across multiple numerical variables. Import your dataset to generate a clean, color-coded correlation heatmap.
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Upload your dataset
Drop your CSV, Excel (.xlsx/.xls), or JSON file here to visualize instantly
Or Paste CSV Data
Paste raw CSV or comma-separated rows below
Try Sample Datasets
Test chart features with 1-click sample data
Key Features & Capabilities
- •Automatic Pearson correlation coefficient ($r$) matrix calculation
- •Color-coded intensity scale (Blue for positive correlation, Red for negative)
- •Select and compare specific subsets of numeric columns
- •Hover tooltips displaying exact r values
- •Export publication-ready PNG images or vector SVG graphics
Frequently Asked Questions
How is the correlation coefficient calculated?
The tool calculates the standard Pearson r coefficient between pairs of numeric columns, returning values between +1.0 (perfect positive correlation) and -1.0 (perfect negative correlation).
Can I select which variables to include?
Yes! Use the variable checklist in Chart Settings to select or deselect specific numeric columns.
Is my data kept private?
Yes, all statistical calculations take place 100% locally in your web browser.