Online R-Squared Calculators and Statistical Tools

Calculate and analyze the coefficient of determination (R-squared) for your datasets. Evaluate regression model fit online with secure server-side processing.

Evaluate the goodness of fit for your regression models using our suite of R-squared tools. Easily calculate the coefficient of determination, analyze dataset variance, and assess statistical models directly from your browser, with all heavy processing handled securely on our servers.

7 Tools

Math, Date & Finance
Adjusted R-Squared Calculator
Calculate adjusted R squared from R squared, sample size, and predictor count
Math, Date & Finance
Linear Regression Calculator
Fit a simple least-squares linear regression model and calculate slope, intercept, R squared, and predictions
Math, Date & Finance
Multiple Linear Regression Calculator
Fit a multiple linear regression model from rows of predictor variables and a numeric target
Math, Date & Finance
Pearson Correlation Calculator
Calculate Pearson r, r squared, covariance, and confidence interval for paired numeric data
Math, Date & Finance
Polynomial Regression Calculator
Fit a polynomial least-squares curve to paired numeric data and inspect coefficients, R squared, and predictions
Math, Date & Finance
R-Squared Calculator
Calculate coefficient of determination R squared from actual and predicted values
Data & Tables
Regression Analyzer
Advanced regression analysis tool for performing linear regression analysis, calculating regression statistics, and making predictions. Perfect for statistical modeling, trend analysis, forecasting, and understanding relationships between variables. Features: - Simple linear regression (y = mx + b) - Multiple linear regression support - Regression coefficients calculation - Statistical significance testing - R-squared and adjusted R-squared - Residual analysis and diagnostics - Prediction intervals and confidence intervals - Outlier detection in regression - Model validation metrics - Visual regression diagnostics - Data transformation support Common Use Cases: - Sales forecasting and trend analysis - Financial modeling and risk assessment - Scientific research and hypothesis testing - Quality control and process optimization - Marketing analytics and ROI analysis - Medical and biological research

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FAQ

How do I calculate R-squared using these tools?

Input your observed and predicted values or upload your dataset through the browser interface. The calculations are processed on our servers to determine the coefficient of determination (R-squared) without requiring any software installation.

Are my datasets and statistical inputs stored?

No. Text inputs are not stored on our servers, and any uploaded data files are automatically and permanently deleted after 6 hours.

Can I calculate adjusted R-squared as well?

Yes, our tools support calculating both standard R-squared and adjusted R-squared to help you accurately evaluate regression models with multiple predictors.