Pressure Converters
Convert between psi, bar, kPa, atm, mmHg, and Pa. Used in automotive, engineering, science, and weather applications.
Tire Pressure Converter
psi ↔ bar ↔ kPa with vehicle presets
Everyday Pressure Conversions
Scientific & Engineering
Atmospheres to Kilopascals
1 atm = 101,325 Pa = 101.325 kPa (standard definition)
Kilopascals to Atmospheres
1 atm = 101.325 kPa (standard definition)
Millimeters of Mercury to Kilopascals
1 mmHg = 133.322387415 Pa
Kilopascals to Millimeters of Mercury
1 mmHg = 133.322387415 Pa
Pascals to Kilopascals
1 kPa = 1,000 Pa (exact, metric prefix)
Kilopascals to Pascals
1 kPa = 1,000 Pa (exact, metric prefix)
Frequently Asked Questions
What is pressure?
Pressure is force per unit area. The SI unit is the pascal (Pa), equal to one newton per square meter.
What is the most common tire pressure unit?
In the US: psi. In Europe: bar. In Australia/Canada: kPa. All measure the same thing.
What is 1 atmosphere in different units?
1 atm = 101,325 Pa = 101.325 kPa ≈ 1.01325 bar ≈ 14.696 psi ≈ 760 mmHg.
What is the difference between gauge and absolute pressure?
Gauge pressure is relative to atmospheric pressure. Absolute pressure includes atmospheric. Tire gauges show gauge pressure.
Why is mmHg used for blood pressure?
Historically, blood pressure was measured with mercury manometers. The mmHg unit persists as the standard for reporting.
Is bar an SI unit?
No, but it's accepted for use with SI. 1 bar = 100,000 Pa exactly.