ποΈ Fluid Mechanics & Thermodynamics
Pressure Unit Converter
Convert pressure and stress values between Pascal, Bar, PSI, Atmospheres, Torr (mmHg), and inHg with SI precision.
Quick Presets:
1 atm to PSI
32 PSI to Bar (Car Tire)
1 Bar to kPa
1013.25 mbar to inHg (Sea Level)
760 Torr to atm
Converted Pressure
1 Atmosphere (atm) = 14.69595 PSI
Equivalent Pressure Across All Major Standards:
Understanding Pressure Units in Science and Engineering
Pressure is defined as the perpendicular force applied per unit area ($P = F / A$). In the International System of Units (SI), the unit of pressure is the Pascal (Pa), named after the 17th-century French polymath Blaise Pascal, defined as one Newton of force applied over one square meter ($1\text{ N/m}^2$).
Pressure Conversion Matrix Reference
| Unit | Pascal (Pa) | Bar | Atmosphere (atm) | PSI (lb/inΒ²) | Torr (mmHg) |
|---|---|---|---|---|---|
| 1 Pa | 1 | $1 \times 10^{-5}$ | $9.8692 \times 10^{-6}$ | $1.45038 \times 10^{-4}$ | $7.5006 \times 10^{-3}$ |
| 1 Bar | 100,000 | 1 | 0.986923 | 14.5038 | 750.062 |
| 1 atm | 101,325 | 1.01325 | 1 | 14.69595 | 760 |
| 1 PSI | 6,894.757 | 0.0689476 | 0.068046 | 1 | 51.7149 |
| 1 Torr | 133.322 | 0.00133322 | 0.00131579 | 0.0193368 | 1 |
Frequently Asked Questions
One hectopascal (100 Pa) is numerically identical to one millibar (1 hPa = 1 mbar). Standard atmospheric pressure at sea level is approximately 1013.25 hPa / mbar. Meteorologists use hPa because it fits the SI system while maintaining historical continuity with barometric pressure maps.
Atmospheric pressure decreases exponentially with altitude because there is less air mass above pushing down. At the summit of Mount Everest (8,848 m / 29,029 ft), atmospheric pressure drops to approx. 33.7 kPa (about 1/3rd of sea level pressure), explaining why climbers require supplemental oxygen.