Convert Pa, kPa, bar, psi, atm, and mmHg instantly
1 atm — Standard atmosphere
Converted Values
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Our free pressure converter lets you instantly switch between all major pressure units — Pascal (Pa), kilopascal (kPa), bar, PSI, standard atmosphere (atm), and millimetres of mercury (mmHg). Whether you're working in engineering, meteorology, medicine, or everyday tasks like tyre pressure, get accurate results in one click with no downloads or sign-up required.
1 bar equals approximately 14.5038 psi. Bar is slightly less than one standard atmosphere (1 atm = 1.01325 bar), so a pressure of 1 bar converts to roughly 14.5 pounds per square inch.
One standard atmosphere (atm) is exactly 101 325 Pa, while 1 bar is exactly 100 000 Pa. They are close but not equal — 1 atm ≈ 1.01325 bar. Meteorologists commonly use hPa (= mbar), while scientists often prefer atm or Pa.
Multiply the kilopascal value by 0.14504 to get psi. For example, 100 kPa × 0.14504 ≈ 14.504 psi. Alternatively, use this tool — enter your kPa value, choose kPa as the from-unit, and read the psi result instantly.
Millimetres of mercury (mmHg) is the traditional unit for blood pressure and gas partial pressures in physiology because early manometers literally measured the height of a mercury column. Normal blood pressure is about 120/80 mmHg, which equals roughly 16/10.7 kPa.