How many PSI is 1 mmHg?

1 millimeter of mercury (mmHg) equals approximately 0.0193368 pounds per square inch (PSI). This is derived from the definition of mmHg: 1 mmHg = 133.322 pascals, and 1 PSI = 6894.757 pascals.

How do I convert mmHg to PSI manually?

Multiply the mmHg value by 0.0193368. For example, 760 mmHg × 0.0193368 = 14.696 PSI (standard atmospheric pressure). To convert PSI back to mmHg, divide by 0.0193368 or multiply by 51.7149.

What is standard atmospheric pressure in mmHg and PSI?

Standard atmospheric pressure is 760 mmHg (also called 760 torr) and 14.6959 PSI. Both represent the average air pressure at sea level and are commonly used as reference points in science and engineering.

Why is blood pressure measured in mmHg?

Blood pressure has been measured in mmHg since the 19th century when mercury manometers were the standard instrument. The unit persists today because of clinical convention. 1 mmHg equals 133.322 pascals or about 0.01934 PSI — blood pressure values in PSI would be tiny decimals, making mmHg more practical.

What is 760 mmHg in PSI?

760 mmHg equals approximately 14.696 PSI. This is the definition of standard atmospheric pressure (1 atm), and it is the baseline reference used in many pressure calculations.

When would I use mmHg versus PSI?

mmHg is standard in medicine (blood pressure, eye pressure), meteorology, and vacuum measurement. PSI is the customary unit in the United States for tire pressure, compressed air, hydraulics, and industrial applications. Use this converter whenever specs are given in one unit but your equipment requires the other.

mmHg to PSI Converter

Name: mmHg to PSI Converter
Availability: InStock
Author: Nham Vu

Enter a pressure in mmHg and get the PSI equivalent instantly, with reverse PSI-to-mmHg conversion included.

Converter

Pressure in mmHg

Result in PSI

Reverse: PSI to mmHg

Pressure in PSI

Result in mmHg

Reference Table

mmHg PSI

1 mmHg 0.019337

10 mmHg 0.193368

50 mmHg 0.966841

100 mmHg 1.93368

120 mmHg 2.32042

200 mmHg 3.86736

300 mmHg 5.80104

500 mmHg 9.66840

760 mmHg 14.6959

1000 mmHg 19.3368

1500 mmHg 29.0052

3000 mmHg 58.0104

Summary

Enter a pressure in mmHg and get the PSI equivalent instantly, with reverse PSI-to-mmHg conversion included.

How it works

Enter the pressure value in mmHg in the top input field.
The PSI result appears instantly with no button press needed.
Use the reverse field to convert PSI back to mmHg.
Click "Copy" next to any result to copy the value to your clipboard.
Check the reference table for common mmHg-to-PSI values at a glance.

Use cases

Convert blood pressure readings from mmHg to PSI for engineering or research contexts.
Translate vacuum pump specifications between mmHg and PSI.
Convert barometric pressure from mmHg to PSI when reading US weather instruments.
Check medical device pressure ratings when working with US PSI-based suppliers.
Convert manometer readings in mmHg to PSI for hydraulic system compatibility.
Translate gas cylinder pressure specs from mmHg to PSI for US equipment.
Verify HVAC system pressure data when switching between mmHg and PSI gauges.
Convert laboratory vacuum pressure from mmHg to PSI for US instrument calibration.

Frequently Asked Questions

Last updated: 2026-07-23 · Reviewed by Nham Vu