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Frequently Asked Questions
Pascal (Pa) is the SI derived unit of pressure, defined as one newton per square meter. It's the standard for scientific measurements. 1 kPa = 1000 Pa, 1 MPa = 1,000,000 Pa.
Bar is a metric unit (1 bar ≈ 100 kPa), commonly used in meteorology and engineering. PSI (pounds per square inch) is the imperial unit used for tire pressure, hydraulics, and many US applications. 1 bar ≈ 14.5038 psi.
1 atm is the average atmospheric pressure at sea level, defined as exactly 101,325 Pa (or 1.01325 bar, 14.6959 psi). It's a reference point for many scientific calculations.
Torr and mmHg (millimeter of mercury) are nearly identical: 1 Torr ≈ 1 mmHg. They are used in vacuum physics and medicine (blood pressure). 1 atm = 760 Torr = 760 mmHg.
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Why use our Pressure Converter?
Pressure conversions can be tricky — from checking your car's tire pressure (psi or bar) to understanding weather maps (hPa or mbar), or doing lab work (Pa, atm). Our tool handles all major units with high precision. Just type a number, choose your units, and get the result instantly. It's 100% client‑side, private, and completely free. Bookmark it for those moments when you need to switch between psi, kPa, or torr in a flash.
Pro tip: Use the "Swap" button to invert the conversion. Click any of the common presets (like 1 atm → psi) to quickly get reference values.