📏 PSI to Millimeters of mercury Converter
Convert psi (psi) to millimeters of mercury (mmHg) instantly, with the formula, a worked example and a conversion table.
Quick answer: 1 pound per square inch (psi) = 51.714925 millimeters of mercury (mmHg). Formula: mmHg = psi × 51.714925.
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PSI to Millimeters of mercury Converter inputs
Result
PSI to Millimeters of mercury conversion table
| PSI (psi) | Millimeters of mercury (mmHg) |
|---|---|
| 0.1 psi | 5.1714925 mmHg |
| 0.5 psi | 25.857463 mmHg |
| 1 psi | 51.714925 mmHg |
| 2 psi | 103.42985 mmHg |
| 3 psi | 155.14478 mmHg |
| 5 psi | 258.57463 mmHg |
| 10 psi | 517.14925 mmHg |
| 20 psi | 1,034.2985 mmHg |
| 25 psi | 1,292.8731 mmHg |
| 50 psi | 2,585.7463 mmHg |
| 100 psi | 5,171.4925 mmHg |
| 1,000 psi | 51,714.925 mmHg |
Other pressure conversions
How to convert psi to millimeters of mercury
Multiply the number of psi by 51.714925 to get millimeters of mercury: mmHg = psi × 51.714925.
Example: 5 psi = 258.57463 mmHg.
The pound per square inch (psi) and the millimeter of mercury (mmHg) are both units of pressure. Need the opposite direction? Use the mmHg to psi converter.
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Metric and imperial units
The metric system (SI) is used by almost every country and by science worldwide. Its units scale by powers of ten – 1 kilometer is 1,000 meters, 1 meter is 100 centimeters – which makes conversions inside the system easy. The imperial and US customary systems (inches, feet, pounds, gallons) are still used daily in the United States and partly in the UK.
Since 1959 the inch has been defined as exactly 2.54 centimeters and the pound as exactly 0.45359237 kilograms, so conversions between the two systems are exact. Note that a US gallon (3.785 L) and an imperial gallon (4.546 L) are different – choose the right one above.
This converter covers 10 categories and 66 units: length, weight, temperature, volume, area, speed, time, data, energy, pressure.
Frequently asked questions
How many millimeters of mercury are in a pound per square inch?
1 pound per square inch = 51.714925 millimeters of mercury.
How do I convert psi to millimeters of mercury?
Use the formula mmHg = psi × 51.714925. For example, 5 psi = 258.57463 mmHg.
How do I convert millimeters of mercury back to psi?
1 millimeter of mercury = 0.019336777 psi. Use the mmHg to psi converter linked on this page.
Are these conversions exact?
Yes – all factors use the internationally defined values (for example 1 inch = 2.54 cm exactly, 1 pound = 0.45359237 kg exactly). Results are rounded to 8 significant digits for display.