Torr to PSI Converter
Common Conversions
| torr | psi |
|---|---|
| 0.01 | 0.000193 |
| 0.1 | 0.001934 |
| 0.25 | 0.004834 |
| 0.5 | 0.009669 |
| 1 | 0.019337 |
| 2 | 0.038674 |
| 5 | 0.096686 |
| 10 | 0.193372 |
| 25 | 0.483429 |
| 50 | 0.966859 |
| 100 | 1.933718 |
| 1000 | 19.337 |
Why this conversion matters in chemistry
Freeze-dryer isolation valve sizing hits this regularly. A 1 torr chamber pressure vents to 14.68 psi atmospheric across the isolation valve — a 14,000-fold pressure ratio across the seat, which drives the shaft-seal torque specification on the valve body. A factor of 0.019337 psi per torr is just 1 atm = 760 torr = 14.696 psi. Mostly bookkeeping at the boundary of torr-graduated lab vacuum equipment and psi-stated industrial pneumatic hardware.
Formula
psi = torr × 0.019337
Worked Examples
760 torr = 14.696 psi
Standard atmospheric pressure — the anchor.
100 torr = 1.934 psi
About a typical rotary-evaporator vacuum setting.
1 torr = 0.01934 psi
About a deep vacuum reading.
380 torr = 7.348 psi
Half-atmosphere — about a reduced-pressure distillation setpoint.
Frequently Asked Questions
How do I convert torr to psi?
Multiply by 0.019337. So 760 torr becomes 14.696 psi — exactly one standard atmosphere. The factor is exact through the standard-atmosphere identity.
Why convert between torr and psi in chemistry?
Lab vacuum systems and manometers default to torr; industrial pneumatic regulators default to psi. Bridging the two is routine when interfacing lab equipment with shop-air or process-gas supplies.
Is torr the same as mmHg?
Effectively yes. 1 torr is defined as exactly 1/760 of a standard atmosphere, which matches mmHg to within 0.000015% — far below any realistic measurement precision.