Vacuum Pump Capacity Calculation Xls May 2026

While paid tools exist (VacuCad, Leybold’s Online Tool), a robust free XLS was published by the European Vacuum Forum (EVF) under an open license. Look for "EVF_Pump_Calculator_v3.xls" on academic or engineering repositories. It includes preloaded pump curves for Edwards, Pfeiffer, and Busch.

[ S_required = \fracQ_totalP_base ]

Where:

Seals, welds, and fittings always have some leak rate. Specify a maximum allowable leak (e.g., 10⁻³ mbar·L/s). vacuum pump capacity calculation xls