Pressure Converter
Convert hydrostatic, barometric, tire inflation, and industrial piping pressure across metric and imperial systems. Provides instant conversions between Bar, PSI, Pascals, Atmospheres, and Torr.
Pressure magnitude to convert
Origin unit of pressure
Destination target pressure unit
Pressure magnitude in selected target unit
How to Use This Calculator
- Enter the pressure magnitude (e.g. car tire inflation pressure).
- Choose the starting pressure unit (e.g., PSI, Bar, or kPa).
- Choose your desired destination pressure unit.
- View the converted pressure and standard atmospheric ratios.
Formula & Calculation Methodology
All pressure conversions route through the SI unit Pascal (1 Pa = 1 N/m²). Exact physical definitions include 1 bar = 100,000 Pa, 1 atm = 101,325 Pa, and 1 psi = 6,894.757293168 Pa.
Worked Example
Standard passenger car tire: 32 PSI to Bar
Standard atmospheric pressure at sea level: 1 atm to mmHg
Frequently Asked Questions
What is standard atmospheric pressure at sea level?↓
Standard sea-level atmospheric pressure is 1 atmosphere (atm), which equals exactly 101.325 kPa, 1.01325 bar, 14.6959 psi, or 760 mmHg.
What is the difference between gauge pressure (psig) and absolute pressure (psia)?↓
Gauge pressure measures pressure relative to ambient atmospheric pressure (a reading of 0 on a tire gauge), while absolute pressure includes atmospheric pressure (psia = psig + 14.7 psi).
How many kilopascals are in 1 bar?↓
One bar equals exactly 100 kilopascals (100 kPa) or 0.1 Megapascals (MPa).
What is a limitation when converting deep-water hydrostatic pressure?↓
Hydrostatic pressure calculations depend on water density, which increases slightly in saltwater compared to freshwater and with temperature shifts.
Related Calculators
Source Citation & Disclaimer
Informational tool only; not licensed tax, legal, or financial advice.