Vacuum Calculators & Converters
Interactive tools for designing, sizing and troubleshooting vacuum systems. Every calculator shows its formulas and works on any device — no sign-up.
Vacuum Unit Converter
Convert between inHg, psi, kPa, mbar, Torr, microns and % vacuum — absolute and gauge.
Boiling Point Under Vacuum
Boiling temperature of water, ethanol, acetone and more at any vacuum level.
Pump-Down Time Calculator
Evacuation time for a chamber — or the pump size you need for a target time.
Vacuum Line Sizing & Conductance
Pipe conductance, effective pumping speed, gas velocity and minimum line diameter.
Leak Rate & Gas Flow Converter
mbar·L/s, Pa·m³/s, Torr·L/s, atm·cc/s, sccm and slm — plus leak-tightness classes.
Mean Free Path & Knudsen Number
Mean free path of air, N₂, He, Ar and more, and the flow regime in your pipe.