How to use this calculator
- Enter predictor observations, response observations, predictor for fitted estimate.
- Choose a display currency, then select Calculate. Results also update after a brief pause while you edit.
- Read the result with the assumptions below. Export details or save a second scenario to compare your choices.
Formula and method
Assumptions and limitations
Use your own matching-period observations. These descriptive calculations are not forecasts, investment advice or a national dataset. Lists accept up to 100 comma-separated numbers; do not enter thousands separators. A fitted value is not a guaranteed forecast. Constant predictor or response series are rejected.
Worked example
For the sample inputs shown above, financial linear regression produces a first result of approximately 2. The assumptions below explain what this result represents.
What the result means
Fit an ordinary least-squares line and inspect slope, intercept, fit and an entered scenario.
Common questions
How is the calculation performed?
Slope = Sxy/Sxx; intercept = mean(y)−slope×mean(x); R² = 1−SSE/Syy.
What does the model leave out?
Use your own matching-period observations. These descriptive calculations are not forecasts, investment advice or a national dataset. Lists accept up to 100 comma-separated numbers; do not enter thousands separators. A fitted value is not a guaranteed forecast. Constant predictor or response series are rejected.
Methodology and transparency
Calculation specification reviewed on 2026-10-14. Mathematical implementation is tested against independent reference fixtures. This does not imply review by a licensed financial professional. Read the testing and precision policy.
Background reference: www.itl.nist.gov — financial method. FinanceMath implements its own calculator.