Inches of Mercury to PSI
Convert inches of mercury to psi instantly. 1 inHg = 0.4911541996 psi. Includes the exact factor, a conversion table of common values and the definition of both units.
How to convert inches of mercury to psi
To convert inches of mercury to psi, divide by 2.0360204611 (multiply by 0.4911541996). 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 = inHg × 0.4911541996
Inches of Mercury to PSI conversion table
The values people look up most often, rounded for reading. Use the calculator above for anything in between.
| Inches of Mercury | PSI |
|---|---|
| 1 inHg | 0.491154 psi |
| 2 inHg | 0.982308 psi |
| 3 inHg | 1.473463 psi |
| 5 inHg | 2.455771 psi |
| 10 inHg | 4.911542 psi |
| 20 inHg | 9.823084 psi |
| 25 inHg | 12.278855 psi |
| 50 inHg | 24.55771 psi |
| 100 inHg | 49.11542 psi |
| 500 inHg | 245.5771 psi |
| 1,000 inHg | 491.1542 psi |
What is a inches of mercury?
The aviation altimeter unit: 29.92 inHg is standard sea-level pressure.
What is a psi?
Pounds per square inch, the US pressure unit for tyres and plumbing.
The formula
psi = inHg × 0.4911541996
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 Inches of Mercury to PSI
- Type the number of inches of mercury 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 inches of mercury page.
Inches of Mercury to PSI — frequently asked questions
How many psi are in a inches of mercury?
One inches of mercury equals 0.4911541996 psi. psi = inHg × 0.4911541996
What is the formula to convert inches of mercury to psi?
The formula is psi = inHg × 0.4911541996. 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 inches of mercury?
Divide instead of multiplying: one psi is 2.0360204611 inHg. 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 inches of mercury 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 inches of mercury 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