Vacuum Pressure - Units Converter

Vacuum converting units - % vacuum - mm Mercury - psi - torr - micron - kPa

The table below can be used to convert between commonly used vacuum units:

%
Vacuum
Torr
(mm Mercury)
Micronpsia,
(lb/in2
abs)
Inches
Mercury
Absolute
Inches
Mercury
Gauge
kPa
abs
0.0 760.0 760,000 14.7 29.92 0.00 101.4
1.3 750.0 750,000 14.5 29.5 0.42 99.9
1.9 735.6 735,600 14.2 28.9 1.02 97.7
7.9 700.0 700,000 13.5 27.6 2.32 93.5
21.0 600.0 600,000 11.6 23.6 6.32 79.9
34.0 500.0 500,000 9.7 19.7 10.22 66.7
47.0 400.0 400,000 7.7 15.7 14.22 53.2
50.0 380.0 380,000 7.3 15.0 14.92 50.8
61.0 300.0 300,000 5.8 11.8 18.12 40
74.0 200.0 200,000 3.9 7.85 22.07 26.6
87.0 100.0 100,000 1.93 3.94 25.98 13.3
88.0 90.0 90,000 1.74 3.54 26.38 12
89.5 80.0 80,000 1.55 3.15 26.77 10.7
90.8 70.0 70,000 1.35 2.76 27.16 9.3
92.1 60.0 60,000 1.16 2.36 27.56 8
93.0 51.7 51,700 1.00 2.03 27.89 6.9
93.5 50.0 50,000 0.97 1.97 27.95 6.7
94.8 40.0 40,000 0.77 1.57 28.35 5.3
96.1 30.0 30,000 0.58 1.18 28.74 4
96.6 25.4 25,400 0.49 1.00 28.92 3.4
97.4 20.0 20,000 0.39 0.785 29.14 2.7
98.7 10.0 10,000 0.193 0.394 29.53 1.3
99.0 7.6 7,600 0.147 0.299 29.62 1.0
99.87 1.0 1,000 0.01934 0.03937 29.88 0.13
99.90 0.75 750 0.0145 0.0295 29.89 0.1
99.99 0.10 100 0.00193 0.00394 29.916 0.013
99.999 0.01 10 0.000193 0.000394 29.9196 0.0013
100 0.00 0 0 0 29.92 0
  • 1 psi (lb/in2) = 6,894.8 Pa (N/m2) = 6.895x10-3 N/mm2 = 6.895x10-2 bar

Convert from % Vacuum to Unit of Pressure

The % of vacuum is a relative value where pressure at normal or standard atmosphere is the base value.

pv% = 100% - (pv / patm) 100%                                       (1)

where

pv% = vacuum (%)

pv = absolute pressure (psia, kPa, bar ..)

patm = absolute presure at normal or standard conditions (psia, kPa, bar ..)

Example - Pressure in kPa and % Vacuum

The vacuum with absolute pressure 4 kPa and standard pressure 101.4 kPa can be calculated as

pv% = 100% - ((4 kPa) / (101.4 kPa)) 100% 

       = 96.1 %

Example - Pressure in kPa and % Vacuum

The vacuum with absolute pressure 0.1 bar and standard pressure 1 bar can be calculated as

pv% = 100% - ((0.1 bar) / (1 bar)) 100% 

       = 90 %

Vacuum Ranges

Pressure
(Pa)
Low vacuum 1x105 to 3x103
Medium vacuum 3x103 to 1x10-1
High vacuum 1x10-1 to 1x10-7
Ultra high vacuum 1x10-7 to 1x10-10
Extremely high vacuum 1x10-10
Perfect vacuum 0
  • Outer space 1x10-4 to < 3x10-15

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