Pressure Converter

Pressure Converter

This converter transforms values between eight common pressure units: PSI, bar, atmospheres (atm), kilopascals (kPa), pascals (Pa), millimeters of mercury (mmHg), torr, and inches of mercury (inHg). Whether you work with tire pressure, hydraulic systems, blood pressure, or weather data, enter your value and select units for an instant conversion.

How Pressure Conversion Works

All conversions use the pascal (Pa) as the base unit. The input value is converted to pascals first, then to the target unit. Key conversion factors to pascals include:

• 1 PSI = 6,894.76 Pa
• 1 bar = 100,000 Pa
• 1 atm = 101,325 Pa
• 1 kPa = 1,000 Pa
• 1 mmHg = 133.322 Pa
• 1 inHg = 3,386.39 Pa

Example

Key Factors in Pressure Unit Selection

• PSI — the standard for tire pressure, compressed air, and hydraulic systems in the US
• Bar and kPa — widely used in Europe and Asia for automotive and industrial applications; 1 bar is approximately 1 atm
• Atmospheres — commonly used in chemistry and diving to express ambient pressure at depth
• mmHg and Torr — the standard units for blood pressure readings and vacuum measurements (1 mmHg is approximately 1 Torr)
• Inches of mercury (inHg) — used in US weather reports for barometric pressure (standard is 29.92 inHg at sea level)

Tips

1. Standard tire pressure is typically 30-35 PSI (2.1-2.4 bar); use this converter when your gauge uses a different unit
2. Normal blood pressure (120/80 mmHg) equals about 16.0/10.7 kPa, which is useful when reading international medical references
3. Standard atmospheric pressure at sea level is 1 atm = 14.696 PSI = 101.325 kPa = 29.92 inHg — a useful reference point for calibration
4. For SCUBA diving, each 10 meters of depth adds approximately 1 atm of pressure to the ambient level