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This tool applies a standard formula from the relevant domain. The computation is deterministic — given the same inputs, the result is always identical. The formula accounts for the primary variables that determine the output.
R² = 1 − SS_res/SS_tot; SS_res = Σ(y−ŷ)²; SS_tot = Σ(y−ȳ)²The calculation requires: Actual Values, Predicted Values. Each parameter contributes to the final result according to the formula above. Accuracy depends on the precision of your input measurements.
Updated: July 2026
A typical use case demonstrating the calculator with representative values.
→ Calculated result based on the formula and provided inputs
Enter your own values to get a personalized result for your specific situation.
→ Result calculated from your specific input values
Ensure denominator values (divisors) are non-zero. The calculator validates this, but understanding which fields cannot be zero helps interpret results correctly.
This calculator uses the formula shown. Real-world results may vary due to factors not captured by the model. Use the result as an estimate and verify with domain-specific standards.
Calculate coefficient of determination from actual and predicted values. Free online data science calculator with instant, accurate results. It applies the calculation formula (R² = 1 − SS_res/SS_tot; SS_res = Σ(y−ŷ)²; SS_tot = Σ(y−ȳ)²). For example: 5-point regression fit — A typical use case demonstrating the calculator with representative values.