PSI to Torr Converter
Common Conversions
| psi | torr |
|---|---|
| 0.01 | 0.517 |
| 0.1 | 5.171 |
| 0.25 | 12.929 |
| 0.5 | 25.857 |
| 1 | 51.715 |
| 2 | 103.43 |
| 5 | 258.575 |
| 10 | 517.149 |
| 25 | 1292.873 |
| 50 | 2585.747 |
| 100 | 5171.493 |
| 1000 | 51714.93 |
Why this conversion matters in chemistry
Leak-checking a mass flow controller is one of the routine spots. A 0.5 psi low-pressure threshold lands at 25.9 torr on the test-stand pressure-decay trace, which is the figure that goes head-to-head against the controller's max-allowable-leak spec when qualifying it. The 51.7149 torr per psi factor falls right out of 1 atm = 14.696 psi = 760 torr. So the conversion is just the bookkeeping that lines up an industrial regulator gauge with the torr scale most lab vacuum gear runs in.
Formula
torr = psi × 51.71493
Worked Examples
14.696 psi = 760 torr
Standard atmospheric pressure expressed in both unit systems.
1 psi = 51.715 torr
The conversion anchor — useful for any quick mental scale check.
5 psi = 258.575 torr
About a typical low-pressure reaction-vessel setting.
30 psi = 1551.4 torr
About an elevated pressure for autoclave reactions.
Frequently Asked Questions
How do I convert psi to torr?
Multiply by 51.7149. So 14.696 psi becomes 760 torr — standard atmospheric pressure. The factor is exact through the standard-atmosphere identity.
When does this conversion show up?
Connecting industrial gas regulators (calibrated in psi) to laboratory vacuum systems that display in torr or mmHg — rotary evaporators, vacuum ovens, leak-test rigs. The conversion is the routine first step at the cross-system boundary.
How do psi, torr, and atm relate?
1 atm = 14.696 psi = 760 torr. So 1 psi ≈ 51.715 torr — the relationships are exact through the international agreement on the standard atmosphere.