Quick answer
Define a line from exactly two concentration-absorbance standards and interpolate an unknown. It does not fit a multi-point regression or check residuals.
Formula and steps
slope = (A2 − A1)/(C2 − C1); intercept = A1 − slope·C1; Cunknown = (Aunknown − intercept)/slope
Normalize the inputs first, keep working precision through intermediate steps, and round only the displayed result. Use the Beer Lambert when the next step requires a different chemistry model.
Assumptions and limits
Define a line from exactly two concentration-absorbance standards and interpolate an unknown. It does not fit a multi-point regression or check residuals.
Frequently asked questions
What does this beer lambert calibration assume?
The assumptions shown above are part of the result. If your system falls outside them, select a more complete method rather than forcing the number.
How should I report the answer?
Keep the units, input basis, significant figures, and model limitations with the result.
What does this calculator not do?
It does not fit a multi-point regression or check residuals.