Poiseuille's Low manual calculation

Hi everyone,
Trying to manually calculate a column flow using the Poiseuille's Low equation. I know there is the Pressure Flow calculator, but I need to understand how it's calculated. I have all initial data (column dimensions, pressure, temperature, carrier gas viscosity) I need.
Does someone know the right way to do it? I have been trying several ways, used different units, triple checked my math, but always had a value which is not even close to the flow value calculated by the Pressure Flow calculator.

I have a feeling I do something wrong. Please advice some calculation flow. Thank you.

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