PSI to mmHg
Convert psi to mmhg instantly. 1 psi = 51.7149252039 mmHg. Includes the exact factor, a conversion table of common values and the definition of both units.
How to convert psi to mmhg
To convert psi to mmhg, multiply by 51.7149252039. 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.
mmHg = psi × 51.7149252039
PSI to mmHg conversion table
The values people look up most often, rounded for reading. Use the calculator above for anything in between.
| PSI | mmHg |
|---|---|
| 1 psi | 51.714925 mmHg |
| 2 psi | 103.42985 mmHg |
| 3 psi | 155.144776 mmHg |
| 5 psi | 258.574626 mmHg |
| 10 psi | 517.149252 mmHg |
| 20 psi | 1,034.3 mmHg |
| 25 psi | 1,292.87 mmHg |
| 50 psi | 2,585.75 mmHg |
| 100 psi | 5,171.49 mmHg |
| 500 psi | 25,857.46 mmHg |
| 1,000 psi | 51,714.93 mmHg |
What is a psi?
Pounds per square inch, the US pressure unit for tyres and plumbing.
What is a mmhg?
Millimetres of mercury, still the clinical unit for blood pressure.
The formula
mmHg = psi × 51.7149252039
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 PSI to mmHg
- Type the number of psi you want to convert.
- Read the result in mmhg 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 mmhg to psi page.
PSI to mmHg — frequently asked questions
How many mmhg are in a psi?
One psi equals 51.7149252039 mmHg. mmHg = psi × 51.7149252039
What is the formula to convert psi to mmhg?
The formula is mmHg = psi × 51.7149252039. It is an exact definition rather than an approximation, so the conversion never drifts no matter how large the number.
How do I convert mmhg back to psi?
Divide instead of multiplying: one mmhg is 0.0193367775 psi. 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 psi to mmhg 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 psi to mmhg.
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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