Vacuum Pressure Conversion Chart | Torr, Micron, mbar, Pa, inHg | Vacuum Pump Supply
Vacuum Pressure Conversion Chart
Quickly convert between Torr, micron, mbar, Pa, kPa, inHg, and mmHg.
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Why Vacuum Unit Conversion Matters
Vacuum specifications are often listed in different units depending on the manufacturer, gauge type, or industry. One pump may be rated in Torr, another in microns, and another in mbar.
This page helps you compare units used in laboratories, industrial processes, HVAC evacuation, and vacuum pump service work. It is also useful when selecting the right vacuum pump oil or repair kit.
Standard Atmospheric Pressure Reference
| Unit | Equivalent |
|---|---|
| 1 atmosphere | 760 Torr |
| 760,000 microns | |
| 1013.25 mbar | |
| 101,325 Pa | |
| 101.325 kPa | |
| 29.92 inHg | |
| 760 mmHg |
Vacuum Conversion Chart
| Unit | Torr | Micron | mbar | Pa | kPa | inHg | mmHg |
|---|---|---|---|---|---|---|---|
| 1 Torr | 1 | 1000 | 1.33322 | 133.322 | 0.133322 | 0.03937 | 1 |
| 1 micron | 0.001 | 1 | 0.001333 | 0.133322 | 0.000133 | 0.000039 | 0.001 |
| 1 mbar | 0.750062 | 750.062 | 1 | 100 | 0.1 | 0.02953 | 0.750062 |
| 1 Pa | 0.0075006 | 7.5006 | 0.01 | 1 | 0.001 | 0.000295 | 0.0075006 |
| 1 kPa | 7.5006 | 7500.6 | 10 | 1000 | 1 | 0.2953 | 7.5006 |
Common Vacuum Levels
- HVAC evacuation: 500 microns
- Good HVAC: 200–300 microns
- Freeze drying: 50–200 microns
- Lab vacuum: 1–10 Torr
- High vacuum: below 1 micron
Important Note
Always confirm whether readings are absolute or gauge pressure</strong