Vacuum - Pressure Units Converter
The table below can be used to convert between commonly used vacuum units:
| % Vacuum | Torr (mm Mercury) | Micron | psia, (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
Download and print Vacuum Units Converter Chart
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
Related Topics
• Gases and Compressed Air
Properties of air, LNG, LPG and other common gases. Pipeline capacities and sizing of relief valves.
Related Documents
Unit Factor Method
Convert between units with the unit factor or factor-label method
Vacuum
Vacuum is defined as air pressure below atmospheric pressure.
Vacuum - Air Expansion Ratio
Convert vacuum air volume to standard air volume
Vacuum - Evacuation Time
Vacuum pumps - calculate flow rate and required evacuation time.
Vacuum Pipes - Flow Velocities
Air velocity diagrams for vacuum pipe lines.
Vacuum Pipes - Pressure Loss vs. Air Flow
Calculate pressure drops in vacuum pipe lines.
Vacuum Pumps - Exhaust Pipe Capacities
Capacities of vacuum pump exhaust pipes.
Water - Boiling Points at Vacuum Pressure
Online calculator, figures and tables giving the boiling temperatures of water in varying vacuum, SI and Imperial units.