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. Built for vacuum pump users, lab technicians, HVAC professionals, and industrial buyers who need fast, reliable pressure conversions.
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View SchematicsWhy 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 makes it harder to compare performance, determine target evacuation levels, or choose the right equipment for your process.
This reference page helps you compare vacuum pressure units commonly used in laboratories, industrial processes, HVAC evacuation, freeze drying, vacuum furnaces, coating systems, and general vacuum pump service work. It is also useful when evaluating system performance and selecting the right vacuum pump oil or repair kit for your equipment.
Standard Atmospheric Pressure Reference
| Unit | Equivalent |
|---|---|
| 1 atmosphere (atm) | 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 | 0.00133322 | 0.133322 | 0.000133322 | 0.00003937 | 0.001 |
| 1 mbar | 0.750062 | 750.062 | 1 | 100 | 0.1 | 0.02953 | 0.750062 |
| 1 Pa | 0.00750062 | 7.50062 | 0.01 | 1 | 0.001 | 0.0002953 | 0.00750062 |
| 1 kPa | 7.50062 | 7500.62 | 10 | 1000 | 1 | 0.2953 | 7.50062 |
| 1 inHg | 25.4 | 25,400 | 33.8639 | 3386.39 | 3.38639 | 1 | 25.4 |
| 1 mmHg | 1 | 1000 | 1.33322 | 133.322 | 0.133322 | 0.03937 | 1 |
Common Vacuum Levels and Applications
| Application | Typical Target Vacuum |
|---|---|
| HVAC evacuation | 500 microns minimum |
| Good HVAC evacuation | 200–300 microns |
| Freeze drying / lyophilization | 50–200 microns |
| Vacuum oven / laboratory drying | 1–10 Torr |
| Degassing oils / resins | 1–100 microns |
| Two-stage rotary vane pumps | Below 1 micron in many applications |
Important Note: Absolute vs Gauge Pressure
When comparing vacuum pump performance, always confirm whether the reading is shown in absolute pressure or gauge pressure. Most deep vacuum specifications are discussed in absolute units such as microns, Torr, mbar, or Pascals. Confusing absolute and gauge readings can lead to incorrect comparisons and poor equipment selection.
Quick Vacuum Conversion Reference
- 1 Torr = 1000 microns
- 500 microns = 0.5 Torr
- 100 microns = 0.1 Torr
- 10 microns = 0.01 Torr
- 1 micron = 0.001 Torr
- 1 mbar = 0.750 Torr
- 1 Torr = 1.333 mbar
- 1 inHg = 25.4 Torr
- 29.92 inHg = 760 Torr
Choosing the Right Vacuum Level for Your Application
Different applications require different target vacuum levels, which is why pressure conversion matters when selecting pumps, oils, and service parts. A technician pulling down an HVAC system may focus on microns, while a laboratory user may compare results in Torr or mbar. Understanding these unit relationships makes it easier to compare specifications across brands and choose the correct maintenance products.
If your system is not reaching the target vacuum level you expect, it may be time to replace your vacuum pump oil, inspect wear items, or browse available vacuum pump repair kits. If you need help identifying the correct parts, start with our schematics, manuals, and exploded views.
Related Resources
Looking for more vacuum pump technical resources? Browse our selection of vacuum pump oils, repair kits, schematics, manuals, and replacement parts to keep your equipment operating at peak performance.
You can also use this conversion chart when comparing pump specifications across brands, troubleshooting vacuum levels, or selecting the right pump for laboratory and industrial applications.