Pound per Square Inch to Torr Formula
Torr = psi x 51.7149
Conversion factors follow SI relationships published by BIPM and NIST, where those standards apply.
Pound per Square Inch to Torr Converter
Quick Answer
1 psi = 51.7149 Torr
Formula: Torr = Pound per Square Inch x 51.7149
Quick values
Worked examples
Convert 1 psi to Torr
Torr = 1 x 51.7149
Result: 1 psi = 51.7149 Torr
Convert 10 psi to Torr
Torr = 10 x 51.7149
Result: 10 psi = 517.149 Torr
Convert 100 psi to Torr
Torr = 100 x 51.7149
Result: 100 psi = 5171.49 Torr
About Pound per Square Inch and Torr
Multiply PSI by about 51.7149 to get torr. 14.696 psi is 760 torr (one standard atmosphere). Use this when a US mechanical drawing in psi must match a vacuum or medical gauge in torr.
Category hub: Pressure Conversion · Conversion charts · Conversion formulas
Pound per Square Inch to Torr Conversion Table
| Pound per Square Inch (psi) | Torr (Torr) |
|---|---|
| 0.5 psi | 25.8575 Torr |
| 1 psi | 51.7149 Torr |
| 2 psi | 103.43 Torr |
| 5 psi | 258.575 Torr |
| 10 psi | 517.149 Torr |
| 14.696 psi | 760.003 Torr |
| 20 psi | 1034.3 Torr |
| 30 psi | 1551.45 Torr |
| 50 psi | 2585.75 Torr |
Browse all conversion charts → · Browse conversion formulas →
Practical use cases for Pound per Square Inch to Torr
US vacuum spec to lab gauges
A 2 psia spec is about 103 torr. Lab techs set the torr gauge to match the mechanical drawing.
Furnace and autoclave
Partial-pressure recipes in psi convert to torr for residual-gas analyzers.
Compressor inlet vacuum
A few psi of inlet vacuum becomes tens of torr on a European instrument.
Altitude chamber work
Cabin or chamber pressure in psi is reported in torr for physiology notes.
Pound per Square Inch to Torr FAQs
Common questions about converting pound per square inch to torr.
How do you convert PSI to torr?
Multiply PSI by 51.7149. Example: 1 psi = 51.715 torr, 14.696 psi = 760 torr, 0.5 psi = 25.857 torr.
What is 2 psi vacuum in torr?
If the 2 psi is an absolute reading, 2 psi ≈ 103.43 torr. If it is a gauge vacuum (2 psi below atmosphere), convert 12.7 psia instead (about 657 torr). Confirm gauge vs absolute before you size a pump.
Why do labs still use torr instead of PSI?
Vacuum work inherited the mercury-column scale. Torr keeps numbers readable from 10⁻³ to 760 without jumping to scientific notation the way pascals would.
Is PSI to torr the same as PSI to mmHg?
For ordinary lab accuracy, yes. For legal metrology, conventional mmHg and torr can differ slightly. Use the mmHg converter when the certificate names millimeters of mercury.
Charts and printable PDF
Use the matching pound per square inch / torr chart when you need a printable table or offline reference.
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