Vacuum Pressure Converter

Convert between vacuum pressure units (Pa, Torr, mbar, atm, psi, micron). Shows vacuum range classification and mean free path at the entered pressure.

Input
Pressure Conversions
Pa
133.32Pa
Torr
1.0000Torr
mbar
1.3332mbar
atm
0.001316atm
psi
0.01934psi
micron (mTorr)
1000.0micron
Vacuum Classification
Vacuum Range
Low Vacuum (Rough)
Mean Free Path (air, 295 K)
49.504μm
Abridged Optics — Vacuum Pressure Converter v1.0Conversions: 1 Torr = 133.322 Pa, 1 mbar = 100 Pa, 1 atm = 101325 Pa, 1 psi = 6894.76 Pa, 1 micron = 0.13332 Pa. MFP: λ ≈ 6.6×10⁻³/p (m, air at 295 K).

All information, equations, and calculations have been compiled and verified to the best of our ability. For mission-critical applications, we recommend independent verification of all values. If you find an error, please let us know.