Pressure Conversion
### Physics & Fluid Mechanics: Pressure Unit Systems **Pressure ($P$)** is defined as normal force applied per unit surface area. The standard SI unit is the **Pascal (Pa)**.
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📐 Formula
💡 Practical Example
Converting standard sea-level atmospheric pressure (1.0 atm): Equals 14.6959 PSI, 1.01325 bar, 101.325 kPa, 760.00 mmHg, and 29.9213 inHg.
📖 About Pressure Conversion
Physics & Fluid Mechanics: Pressure Unit Systems
Pressure (P) is defined as normal force applied per unit surface area. The standard SI unit is the Pascal (Pa), where 1 Pa = 1 Newton per square meter = 1 N/m^
2.
Core Pressure Unit Equivalencies
- Standard Atmosphere: 1 atm = 101,325 Pa = 101.325 kPa = 1.01325 bar = 14.6959 PSI = 760 mmHg
- Bar: 1 bar = 100,000 Pa = 100 kPa = 0.986923 atm = 14.5038 PSI
- Pounds per Square Inch: 1 PSI = 6,894.76 Pa = 6.89476 kPa = 0.068948 bar = 51.7149 mmHg
- Millimeters of Mercury: 1 mmHg (Torr) = 133.322 Pa = 0.019337 PSI
- Inches of Mercury: 1 inHg = 3,386.39 Pa = 25.4 mmHg = 0.491154 PSI
Absolute vs Gauge Pressure
- Gauge Pressure: Pressure relative to ambient atmospheric pressure. Tire pressure gauges read 0 when vented to the atmosphere.
- Absolute Pressure: Total pressure including atmospheric pressure.
How to Use This Calculator
Enter your Pressure Magnitude (e.g. 1.0) and From Pressure Unit — choose from Standard Atmospheres (atm), Pounds per Square Inch (PSI / psi), Bar (bar). Results update instantly as you type — adjust any value to compare scenarios.
The Formula
Conversion factors (to SI base unit or reference unit):
pascals: 1.0
kilopascals: 1000.0
megapascals: 1000000.0
bar: 100000.0
atmospheres: 101325.0
psi: 6894.757293168
mmhg_torr: 133.322387415
inhg: 3386.388666667
Worked Example
Converting standard sea-level atmospheric pressure (1.0 atm): Equals 14.6959 PSI, 1.01325 bar, 101.325 kPa, 760.00 mmHg, and 29.9213 inHg.
Understanding Your Result
Unit conversions are exact by definition within a given measurement system (e.g., 1 km = exactly 1,000 m). Cross-system conversions (metric to imperial) use defined exchange factors: 1 inch = exactly 2.54 cm; 1 pound = 0.45359237 kg. Round your converted result to match the precision of your original measurement — expressing more decimal places than your input justifies implies false accuracy. For regulatory, legal, or safety-critical applications, verify which measurement system is required by the applicable standard.
💡 Methodological Standards & Calculation Accuracy
- All calculations are performed client-side in your browser using verified, standards-compliant mathematical algorithms.
- Results are provided for educational and informational analysis; verify critical applications with certified domain specialists.
- Ensure input values are entered in consistent units matching the selector options to guarantee accurate outputs.
- Periodic recalibration is recommended whenever baseline assumptions, operating parameters, or external conditions change.
Results are for informational and educational purposes only. Always verify critical decisions with a qualified professional.