🔁 HPLC Method Transfer Calculator
Scale flow rate and injection volume when transferring a method between HPLC columns of different length or diameter (same particle size).
Frequently asked questions
What does this method transfer calculation assume?
It assumes the new column uses the same stationary phase chemistry and particle size as the original, and scales flow rate and injection volume to keep the number of column volumes (and therefore linear velocity and k') approximately constant between the two columns.
Do I need to adjust the gradient program too?
For an isocratic method, no further adjustment is typically needed beyond flow rate. For a gradient method, gradient segment times should be scaled by the same ratio as flow rate and injection volume to preserve the same %B at each point in the run.
What if the new column also has a different particle size?
This calculator assumes matched particle size. If particle size differs (e.g. transferring from 5µm to sub-2µm UHPLC particles), use the LC to UHPLC Method Transfer Calculator instead, which includes a particle size correction term.
Accuracy & how this is derived
Derivation: Column volume scaling: new flow rate and injection volume are both multiplied by the ratio of column volumes (dc2^2 * L2)/(dc1^2 * L1), keeping the number of column volumes per minute and per injection constant between the two columns.
Validated against: Standard geometric method transfer approach described in USP General Chapter <621> and HPLC method development references; assumes identical particle size and stationary phase.
⚠️ For educational and research support only — verify critical results independently before use in regulated, clinical, or publication-bound work.
✔ Last updated: July 2026 · Report an error
Scaling HPLC methods between column dimensions
Transferring a chromatographic method between columns of different length or internal diameter requires scaling both flow rate and injection volume to maintain equivalent linear velocity and analyte dilution, otherwise retention times, peak shapes, and sensitivity will shift even though the same stationary phase chemistry is used. The scaling factor is based on the ratio of column volumes, calculated from the square of the internal diameter ratio multiplied by the length ratio, applied identically to both flow rate and injection volume.