⚡ LC to UHPLC Method Transfer Calculator
Scale flow rate, injection volume, and gradient time when transferring a conventional HPLC method to a UHPLC column with smaller particles.
Frequently asked questions
How is this different from the standard HPLC Method Transfer Calculator?
The standard HPLC Method Transfer Calculator assumes the same particle size on both columns and only scales for column volume. This calculator additionally scales gradient/run time for the difference in particle size between a conventional HPLC column (typically 3-5µm) and a UHPLC column (typically sub-2µm), since smaller particles run efficiently at higher linear velocities.
Will my existing UHPLC system handle the calculated flow rate?
Not necessarily — sub-2µm particle columns generate significantly higher backpressure, and the calculated flow rate must be checked against your instrument's maximum pressure rating. UHPLC instruments are specifically designed for higher pressure; a conventional HPLC pump may not tolerate the same flow rate on a UHPLC column.
Does this calculator guarantee equivalent chromatographic results?
No — it provides a starting-point geometric scaling based on column dimensions and particle size, which is a standard first approximation for method transfer. Actual peak shape, resolution, and retention may still shift due to differences in extra-column volume, detector cell volume, and system dwell volume between HPLC and UHPLC instruments, so confirmatory runs are always needed.
Accuracy & how this is derived
Derivation: Column volume ratio scales flow rate and injection volume identically to the standard HPLC transfer method; gradient time is additionally scaled by the ratio of particle sizes (dp2/dp1) to account for the efficiency gain from smaller particles, a widely used approximation in HPLC-to-UHPLC method transfer guides.
Validated against: Standard geometric scaling approach consistent with published UHPLC method transfer application notes (e.g. Waters, Agilent); approximation only — empirical verification recommended.
⚠️ 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
Transferring conventional HPLC methods to UHPLC
Moving a method from a conventional HPLC column to a UHPLC column with sub-2-micron particles requires scaling flow rate and injection volume for the change in column volume, and additionally adjusting gradient or run time for the difference in particle size, since smaller particles achieve equivalent separation efficiency in proportionally less time. This geometric approach gives a defensible starting point for UHPLC method development, though system dwell volume differences between HPLC and UHPLC instruments still typically require some empirical fine-tuning to fully match the original method's selectivity.