Pressure Converter – Convert Pascal, PSI, Bar, Atmosphere & More
Accurate, instant pressure unit conversions between Pascals (Pa), Bars, PSI, Atmospheres (atm), Torr, and 12+ units. Ideal for engineering, meteorology, diving, and automotive applications — no sign-up required.
SI base unit: Pascal (Pa). All values are expressed in Pascals. Use this table for quick comparisons.
| Unit Name | Symbol | Equivalent in Pascals (Pa) | System |
|---|
Instant Pressure Unit Conversion – Science & Engineering
Pressure is defined as force per unit area. Our pressure converter supports all major units: Pascal (Pa), Kilopascal (kPa), Megapascal (MPa), Bar, Millibar (mbar), PSI (pounds per square inch), Atmosphere (atm), Torr, Millimeter of Mercury (mmHg), Inch of Mercury (inHg), Foot of Water (ftH₂O), and Centimeter of Water (cmH₂O).
Understanding Different Pressure Units
The Pascal (Pa) is the SI unit of pressure, equal to one newton per square meter. It is a small unit; common multiples are kilopascal (kPa) and megapascal (MPa).
Metric Pressure Units
Bar is widely used in meteorology and engineering. 1 bar = 100,000 Pa. Millibar (mbar) = 100 Pa, often used for air pressure.
Imperial/US Customary Units
PSI (pounds per square inch) is common in automotive tires, hydraulic systems, and industrial applications in the US. 1 PSI ≈ 6894.76 Pa.
Atmospheric and Vacuum Units
Atmosphere (atm) is the average pressure at sea level: 1 atm = 101,325 Pa. Torr and mmHg are nearly identical (1 Torr ≈ 133.322 Pa), used in vacuum measurements and medicine.
Fluid Head Units
Inch of Mercury (inHg) and Foot of Water (ftH₂O) are based on the height of a liquid column, used in hydraulics and aviation.
How to Convert Pressure Units
All conversions use the base unit Pascal. Multiply the value in the source unit by its Pascal factor, then divide by the target unit’s Pascal factor.
- PSI to Bar: multiply by 0.0689476 (1 PSI ≈ 0.06895 bar)
- Bar to PSI: multiply by 14.5038
- Atm to kPa: multiply by 101.325
Real-World Pressure Examples
- Standard car tire pressure: about 32 PSI ≈ 2.2 bar ≈ 220 kPa.
- Atmospheric pressure at sea level: 1 atm = 101.325 kPa = 14.7 PSI.
- Blood pressure (systolic) typical: 120 mmHg ≈ 16 kPa.
- Diving pressure increases by 1 atm every 10 meters of seawater.
Quick Pressure Conversion Reference
| Conversion | Value |
|---|---|
| 1 bar | 100,000 Pa | 14.5038 PSI | 0.98692 atm |
| 1 PSI | 6,894.76 Pa | 0.0689476 bar | 0.068046 atm |
| 1 atm | 101,325 Pa | 1.01325 bar | 14.6959 PSI | 760 Torr |
| 1 Torr | 133.322 Pa | 0.00133322 bar | 0.0193368 PSI |