mmHg to PSI
Convert mmhg to psi instantly. 1 mmHg = 0.0193367775 psi. Includes the exact factor, a conversion table of common values and the definition of both units.
How to convert mmhg to psi
To convert mmhg to psi, divide by 51.7149252039 (multiply by 0.0193367775). The relationship is fixed, so the same factor works for any quantity — there is nothing to look up and nothing that changes with temperature, location or context.
psi = mmHg × 0.0193367775
mmHg to PSI conversion table
The values people look up most often, rounded for reading. Use the calculator above for anything in between.
| mmHg | PSI |
|---|---|
| 1 mmHg | 0.019337 psi |
| 2 mmHg | 0.038674 psi |
| 3 mmHg | 0.05801 psi |
| 5 mmHg | 0.096684 psi |
| 10 mmHg | 0.193368 psi |
| 20 mmHg | 0.386736 psi |
| 25 mmHg | 0.483419 psi |
| 50 mmHg | 0.966839 psi |
| 100 mmHg | 1.933678 psi |
| 500 mmHg | 9.668389 psi |
| 1,000 mmHg | 19.336777 psi |
What is a mmhg?
Millimetres of mercury, still the clinical unit for blood pressure.
What is a psi?
Pounds per square inch, the US pressure unit for tyres and plumbing.
The formula
psi = mmHg × 0.0193367775
Every result on this page comes from this formula. Nothing is rounded until the final display, so figures match a spreadsheet to the cent.
How to use the mmHg to PSI
- Type the number of mmhg you want to convert.
- Read the result in psi straight away — there is no button to press.
- Check the table below for the values that come up most often, or reverse the conversion with the linked psi to mmhg page.
mmHg to PSI — frequently asked questions
How many psi are in a mmhg?
One mmhg equals 0.0193367775 psi. psi = mmHg × 0.0193367775
What is the formula to convert mmhg to psi?
The formula is psi = mmHg × 0.0193367775. It is an exact definition rather than an approximation, so the conversion never drifts no matter how large the number.
How do I convert psi back to mmhg?
Divide instead of multiplying: one psi is 51.7149252039 mmHg. The reverse converter is linked in the related tools list.
Is this conversion exact?
Yes. Both units are defined against the same base unit by international agreement, so the factor is exact — any rounding you see is only in the display, which you can widen by entering more decimal places.
Is this mmhg to psi free to use?
Yes. Every calculator on the site is free, needs no sign-up, and runs entirely in your browser, so your figures never leave your device.
What people search for
This page answers each of these searches. They are the exact phrases visitors use to find the mmhg to psi.
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About this calculator
Written and reviewed by The Samsung Calculator editorial team. Every calculator is written against a published formula, reviewed against at least one independent reference implementation, and dated when it changes.
Last reviewed August 19, 2026 · Calculation runs client-side · No data collected · Report an error