HPLC Method Calculator

When switching HPLC columns — say, moving from a 150 mm to a 100 mm column or scaling down to a UHPLC system — the HPLC Method Calculator translates your existing method parameters to the new column geometry so separation performance is maintained. Enter your current column dimensions (length, diameter, particle size), flow rate, injection volume, and max observed pressure, then enter your new column dimensions and select your system type (HPLC or UHPLC). The calculator returns the new flow rate, adjusted injection volume, estimated pressure, and runtime change.

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Results

New Flow Rate

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New Injection Volume

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Estimated Pressure

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Runtime Change

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Frequently Asked Questions

What is HPLC method transfer?

HPLC method transfer is the process of adapting an existing chromatographic method to run on different instrumentation, column dimensions, or particle sizes while maintaining equivalent separation performance.

How do I calculate the new flow rate for UHPLC conditions?

The new flow rate is calculated based on the ratio of column volumes and particle sizes between the old and new columns. This maintains similar linear velocity and separation efficiency.

Why does injection volume need to be adjusted?

Injection volume should be proportional to the column volume to maintain peak capacity and avoid overloading. Smaller columns typically require smaller injection volumes.

What causes pressure changes during method transfer?

Pressure changes result from differences in column dimensions and particle sizes. Smaller particles and longer columns increase backpressure, while larger diameters decrease it.

Can I transfer methods between HPLC and UHPLC systems?

Yes, methods can be transferred between HPLC and UHPLC systems by adjusting flow rates, injection volumes, and gradient conditions to account for different column specifications and system capabilities.

How accurate are the calculated pressure estimates?

Pressure estimates are based on theoretical calculations and typical system parameters. Actual pressures may vary depending on mobile phase viscosity, temperature, and instrument-specific factors.