Pressure Converter
Convert between 50+ pressure units instantly - from deep vacuum to geological pressures.
Reference Pressures
Popular Pressure Conversions
Pressure Measurement Facts & History
Standard atmospheric pressure at sea level is 14.7 psi, which equals 101.325 kilopascals or 1 atmosphere.
Car tires typically operate at pressures between 30 and 35 psi to balance safety, comfort, and fuel efficiency.
A pressure cooker works by increasing internal pressure to about 15 psi above atmospheric, raising the boiling point of water.
Normal human blood pressure is measured as 120/80 mmHg, a unit originally based on the height of a mercury column.
Weather forecasts display air pressure in millibars or hectopascals, where low-pressure systems usually bring storms.
High-pressure weather systems, generally above 1020 millibars, are associated with clear skies and stable conditions.
Frequently Asked Pressure Conversion Questions
How many PSI are in 1 bar?
1 bar is equal to approximately 14.5038 PSI. This conversion is commonly used for tire pressure, compressors, and industrial systems.
What is the difference between PSI and kPa?
PSI is an imperial unit used mainly in the US, while kPa is a metric SI unit. One PSI equals 6.89476 kPa.
What is standard atmospheric pressure?
Standard atmospheric pressure at sea level is defined as 1 atm = 101.325 kPa = 14.7 PSI.
How do you convert mmHg to PSI?
To convert millimeters of mercury (mmHg) to PSI, multiply the value by 0.0193368. This is widely used in medical contexts.
Which pressure units are used in weather reports?
Weather pressure is usually reported in hectopascals (hPa) or millibars (mbar), especially in meteorology and aviation.
Why Meteorologists Don't Use PSI: Understanding hPa & Barometers
Your bike pump uses PSI, but the weather report uses hPa. Why? We explain the 'Dollar Bill' analogy and how to read a barometer to predict storms.
Read Full ArticlePSI vs Bar: The Ultimate Tyre Pressure Guide & Conversion Chart
Gas station pump says PSI, car door says Bar? Don't guess. We explain the difference, the magic 14.5 conversion, and why getting it wrong costs you fuel.
Read Full ArticleUniversal Converters Pressure Converter – Professional tool supporting 40+ pressure units from vacuum-level pascals to ultra-high industrial pressures. Accurate conversions for engineering, automotive, medical, and scientific applications.
Convert PSI to bar, pascals to atmospheres, mmHg to kPa, and all common pressure measurements instantly. Trusted by engineers, technicians, researchers, and students worldwide.