Pressure Converter
Convert pressure units: PSI, bar, pascal and atmosphere.
Pressure units vary by field: meteorologists use hectopascals (hPa) or millibars, engineers use PSI and bar, physicists use pascals, and medical contexts use mmHg (same as blood pressure). This converter handles all common pressure units and includes reference points for everyday context — atmospheric pressure at sea level, tyre pressure ranges, blood pressure normal values, and deep sea pressures.
📋 How to Use This Calculator
Enter a pressure value and select the source unit. All equivalent values are displayed. The reference tab shows common pressure values: standard atmosphere (1 atm = 101,325 Pa = 14.696 PSI = 1,013.25 hPa), typical car tyre pressure (30–35 PSI = 2.07–2.41 bar), and blood pressure (systolic 120 mmHg = 16 kPa = 2.32 PSI).
💡 Key Facts & Information
Key conversions: 1 atm = 101,325 Pa = 101.325 kPa = 1,013.25 hPa = 14.696 PSI = 1.01325 bar = 760 mmHg = 760 torr. 1 bar = 100,000 Pa = 14.504 PSI = 750.06 mmHg. 1 PSI = 6,894.76 Pa = 0.06895 bar = 51.715 mmHg. Tyre pressure context: car tyres typically 30–35 PSI (2.07–2.41 bar), motorcycle tyres 28–42 PSI, truck tyres 90–120 PSI. Altitude effect on atmospheric pressure: at 1,000m altitude, pressure drops to 899 hPa; at 5,000m (Everest base camp): 540 hPa; at 8,849m (Everest summit): 337 hPa (one-third of sea level) — why oxygen is needed.