PSI to mmHg Converter
Common Conversions
| psi | mmHg |
|---|---|
| 0.1 | 5.171 |
| 0.5 | 25.857 |
| 1 | 51.715 |
| 2 | 103.43 |
| 5 | 258.575 |
| 10 | 517.149 |
| 14.696 | 760 |
| 20 | 1034.299 |
| 30 | 1551.448 |
| 50 | 2585.747 |
| 100 | 5171.493 |
Why this conversion matters in chemistry
Pulmonary function test calibration manifolds operate on psi at the gauge but export mmHg in the patient report. A 2.0 psi calibration test pressure becomes 103.4 mmHg on the spirometer's calibration certificate, alongside the ambient barometric reading. A factor of 51.7149 mmHg per psi is just the standard-atmosphere identity (1 atm = 14.696 psi = 760 mmHg). Mostly bookkeeping at the boundary of pneumatic-equipment psi readings and mmHg clinical reporting.
Formula
mmHg = psi × 51.71493
Worked Examples
14.696 psi = 760 mmHg
Standard atmospheric pressure expressed in both unit systems.
1 psi = 51.715 mmHg
The conversion anchor — useful for any quick mental check.
0.5 psi = 25.857 mmHg
About a low-vacuum gauge reading.
30 psi = 1551.45 mmHg
About a moderate compressed-gas regulator output.
Frequently Asked Questions
How do I convert psi to mmHg?
Multiply by 51.7149. So 14.696 psi becomes 760 mmHg — standard atmospheric pressure. The factor is exact through the standard-atmosphere identity.
How many mmHg is 1 psi?
About 51.715 mmHg per psi. The factor is exact through the international agreement on the standard atmosphere.
Why convert psi to mmHg?
Lab vacuum pumps and manometers often display in mmHg; gas supply regulators read in psi. Bridging the two ensures correct pressure settings for vacuum distillation, filtration, and other equipment that crosses between pneumatic and mercury-column instrumentation.
What's standard atmospheric pressure in both?
1 atm = 14.696 psi = 760 mmHg, all by definition. The chain links the US-customary psi scale and the historical mercury-column scale through the modern atm reference.