Pressure Converter
Enter a pressure, choose the unit it is in and the unit you want. You get the converted pressure and a table of the same pressure in every unit.
Your numbers
How we calculate it
Every pressure is turned into pascals and then into the unit you want. One standard atmosphere is 101,325 Pa and one bar is 100,000 Pa. A psi is a pound of force per square inch, 6,894.757293168 Pa. A millimeter of mercury is 133.322387415 Pa, and a torr is 1/760 of an atmosphere, 133.3223684 Pa.
So 1 atmosphere is 14.6959487755 psi, 1.01325 bar and 760 torr. Results are shown to 12 significant digits.
Assumptions and limits
- The mmHg and the torr differ by less than one part in a million, so 1 atmosphere is 760 torr and about 759.9999 mmHg. For everyday use they are the same.
- These are absolute pressure units. A gauge pressure, such as a tire pressure, is measured above the atmosphere, so add about 14.7 psi to turn it into an absolute pressure.
- Blood pressure is measured in mmHg. This converter is for general use, not for medical decisions.
Frequently asked questions
How many psi are in an atmosphere?
One standard atmosphere is 14.6959487755 psi, which is usually rounded to 14.7 psi.
How do I convert psi to bar?
Divide the psi by 14.5037738, or multiply by 0.0689475729. For example 32 psi is about 2.206 bar.
What is the difference between mmHg and torr?
They are almost the same. A torr is exactly 1/760 of an atmosphere, and a millimeter of mercury is based on the density of mercury, which makes it very slightly smaller.
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Worked example (a fixed example using the starting numbers, it does not change as you type)
Inputs: Value to convert = 1; From = standard atmosphere (atm); To = pound per square inch (psi).
- Result 14.6959487755 psi
- Conversion 1 atm = 14.6959487755 psi
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