Torr to Psi Converter
Enter the value that you want to convert torr to psi or psi to torr.
1 torr = 0.0193368 psi
Formula: psi = torr value × 0.0193368
torr to psi
10 torr = 0.19337 psi
Popular Pressure Converters:
How Torr Relates to Psi
What is Torr?
Torr (Torr) is a unit of pressure measurement. 1 torr is equal to 0.0193368 psi.
What is Psi?
Psi (psi) is a unit of pressure measurement. 1 psi is equal to 51.7149326 torr.
Pressure Units Across Industries
Pressure measurements vary dramatically by industry. Meteorologists report in millibars or hectopascals, tire shops use PSI, scuba divers think in atmospheres or bar, vacuum engineers work in torr, and hydraulic systems specify in megapascals. A single industrial plant might encounter all these units across different equipment manuals, safety datasheets, and regulatory standards from different countries.
torr to psi metric conversion table
| 0.01 Torr | = | 0.00019 psi |
| 0.1 Torr | = | 0.00193 psi |
| 1 Torr | = | 0.01934 psi |
| 2 Torr | = | 0.03867 psi |
| 3 Torr | = | 0.05801 psi |
| 4 Torr | = | 0.07735 psi |
| 5 Torr | = | 0.09668 psi |
| 6 Torr | = | 0.11602 psi |
| 7 Torr | = | 0.13536 psi |
| 8 Torr | = | 0.15469 psi |
| 9 Torr | = | 0.17403 psi |
| 10 Torr | = | 0.19337 psi |
| 11 Torr | = | 0.21270 psi |
| 12 Torr | = | 0.23204 psi |
| 13 Torr | = | 0.25138 psi |
| 14 Torr | = | 0.27071 psi |
| 15 Torr | = | 0.29005 psi |
| 16 Torr | = | 0.30939 psi |
| 17 Torr | = | 0.32873 psi |
| 18 Torr | = | 0.34806 psi |
| 19 Torr | = | 0.36740 psi |
| 20 Torr | = | 0.38674 psi |
| 30 Torr | = | 0.58010 psi |
| 40 Torr | = | 0.77347 psi |
| 50 Torr | = | 0.96684 psi |
| 60 Torr | = | 1.16021 psi |
| 70 Torr | = | 1.35357 psi |
| 80 Torr | = | 1.54694 psi |
| 90 Torr | = | 1.74031 psi |
| 100 Torr | = | 1.93368 psi |
| 200 Torr | = | 3.86735 psi |
| 300 Torr | = | 5.80103 psi |
| 400 Torr | = | 7.73471 psi |
| 500 Torr | = | 9.66839 psi |
| 600 Torr | = | 11.60206 psi |
| 700 Torr | = | 13.53574 psi |
| 800 Torr | = | 15.46942 psi |
| 900 Torr | = | 17.40310 psi |
| 1000 Torr | = | 19.33677 psi |
How to Convert Torr to Psi?
We can convert torr to psi by using an example.
Example:
Convert 20 Torr to Psi?
We know 1 Torr = 0.0193368 psi; 1 Psi = 51.7149326 torr.
20 torr = ___psi
20 × 0.0193368 = 0.38674 psi (we know 1 torr = 0.0193368 psi)
Answer:
20 torr = 0.38674 psi
How to Convert Torr to PSI (Step-by-Step)
Converting torr to PSI is needed when vacuum gauge readings must be compared with US industrial pressure standards. The conversion factor is 1 torr = 1/51.7149 PSI ≈ 0.019337 PSI.
- Write down the pressure value in torr.
- Divide the torr value by 51.7149 (or multiply by 0.019337).
- The result is the equivalent pressure in PSI (absolute).
- For gauge pressure (PSIG), remember that 0 PSIG = 14.696 PSIA = 760 torr.
Common Torr to PSI Conversions
Vacuum pressures converted from torr to PSI for US industrial applications.
| Torr | Psi |
|---|---|
| 760 torr | 14.696 PSI |
| 500 torr | 9.67 PSI |
| 254 torr | 4.91 PSI |
| 100 torr | 1.93 PSI |
| 25.4 torr | 0.491 PSI |
| 10 torr | 0.193 PSI |
| 1 torr | 0.01934 PSI |
| 0.1 torr | 0.001934 PSI |
Solved Examples: Torr to PSI
Question 1: A vacuum pump achieves 50 torr ultimate pressure. Express in PSIA.
Solution:
Pressure in PSI = Pressure in torr ÷ 51.7149
= 50 ÷ 51.7149
= 0.967 PSIA
Answer: 50 torr = 0.967 PSIA — this is 14.696 - 0.967 = 13.73 inches of vacuum on a compound gauge.
Question 2: A vacuum gauge reads 200 torr. Convert to PSIA for a US data logger.
Solution:
Pressure in PSI = 200 ÷ 51.7149
= 3.867 PSIA
Answer: 200 torr = 3.87 PSIA = 10.83 PSIG vacuum (below atmospheric).
Question 3: A degassing chamber requires <5 torr. Express threshold in PSIA.
Solution:
Pressure in PSI = 5 ÷ 51.7149
= 0.09669 PSIA
Answer: 5 torr = 0.097 PSIA — well below atmospheric, requiring a robust vacuum pump.
Practice Questions: Torr to PSI
Try solving these on your own to test your understanding:
- Convert 100 torr to PSI. (Answer: 1.934 PSIA)
- A vacuum system reaches 0.5 torr. Express in PSI. (Answer: 0.00967 PSIA)
- Convert 400 torr to PSI. (Answer: 7.74 PSIA)
- What is 25 torr in PSIA? (Answer: 0.483 PSIA)
- Convert 760 torr to PSI. (Answer: 14.696 PSIA)
US Vacuum Gauge Scales: PSIA, PSIG, and inHg
US vacuum measurements use three scales: PSIA (pounds per square inch absolute) — zero is perfect vacuum; PSIG (gauge) — zero is atmospheric, negative values indicate vacuum; inHg vacuum — inches of mercury below atmosphere (0-29.92 range). Converting from torr: for PSIA, divide by 51.7149; for PSIG, calculate PSIA then subtract from 14.696; for inHg, divide torr by 25.4 and subtract from 29.92. These relationships prevent confusion when reading different gauge types.
Vacuum Specifications in US Manufacturing
US manufacturing specifications often state vacuum requirements as "X inches of mercury" or "Y PSIA." A thermoforming machine needing "20 inHg vacuum" means: (29.92-20) × 25.4 = 252 torr absolute = 4.88 PSIA. A vacuum degassing spec of "< 1 PSIA" means < 51.7 torr. Knowing these conversions helps interpret equipment manuals and procurement specifications written in different vacuum measurement traditions.
Compound Gauges: Reading Vacuum in PSI
Compound pressure gauges display both positive pressure (PSI above atmospheric) and vacuum (PSI below atmospheric, or inHg). The vacuum side typically shows 0-30 inHg or 0-14.7 PSI of vacuum. At 100 torr absolute: vacuum = 760-100 = 660 torr = 660/25.4 = 26 inHg vacuum = (14.696-1.93) = 12.77 PSI vacuum. These gauges are standard on HVAC systems, refrigeration equipment, and industrial process lines.
Key Takeaways
- Divide torr by 51.7149 to get PSI (absolute).
- 760 torr = 14.696 PSIA = 0 PSIG (atmospheric reference).
- US vacuum is often expressed as "inches of mercury" (inHg): 1 inHg = 25.4 torr.
- Compound gauges show vacuum as negative PSIG or inHg below atmosphere.
- For PSIG vacuum: PSIG = 14.696 - (torr ÷ 51.7149).
- Different US industries use different vacuum scales — always clarify which one.
Torr to Psi Conversion Formula
psi = torr × 0.0193368
1 torr = 0.0193368 psi
1 psi = 51.7149326 torr
Reverse: torr = psi × 51.7149326
Frequently Asked Questions
How many psi are in 1 torr?
There are 0.0193368 psi in 1 torr. To convert torr to psi, multiply the value by 0.0193368.
How do I convert torr to psi?
Multiply your torr value by 0.0193368 to get the equivalent in psi. For example, 5 torr = 5 × 0.0193368 = 0.09668 psi.
How do I convert psi to torr?
Multiply your psi value by 51.7149326 to get the equivalent in torr. Alternatively, divide by 0.0193368.
What is 10 torr in psi?
10 torr is equal to 0.19337 psi.
What is 100 torr in psi?
100 torr is equal to 1.93368 psi.