Pressure Converter - PSI, Bar, Pascal & Atm Calculator
⚙️ Engineering & Auto

Pressure Converter

The ultimate tool for fluid dynamics and tire safety. Convert accurately between Pounds per Square Inch (PSI), Bar, Pascals, and Atmospheres for any application.

Pressure Engine

Enter pressure value to convert.

🌪️ Pressure Value
🎯 Decimal Precision
CONVERTED PRESSURE
14.5038
PSI
Conversion Formula:
1 bar ≈ 14.5038 psi
Kilopascals 100 kPa
🌍
Atmospheres 0.987 atm
🩺
Torr (mmHg) 750.06 Torr

Understanding Pressure Units

Pressure is defined as Force divided by Area. Different regions and industries favor different units based on historical context.

🚗
PSI (Pounds/Sq Inch)

The standard for automotive tires in the USA and UK. Also common in industrial hydraulics.

🧪
Pascal (Pa)

The SI unit of pressure. 1 Pa = 1 Newton per Square Meter. It is very small, so we usually use kPa or MPa.

🏭
Bar

Metric-friendly unit used in meteorology and diving. 1 Bar is roughly equal to atmospheric pressure at sea level.

Pressure Conversion Factors

Conversion Multiplier Reverse
Bar to PSI × 14.5038 ÷ 14.5038
Atm to Pascal × 101,325 ÷ 101,325
PSI to kPa × 6.89476 ÷ 6.89476
Torr to Atm ÷ 760 × 760

Real World Pressure Levels

☁️

Atmospheric Pressure

Standard pressure at sea level is **101.3 kPa** or **14.7 psi**. Weather reports often use Millibars or Hectopascals.

🚲

Tire Pressure

Car tires are typically **30-35 PSI**. Road bike tires can go up to **100 PSI**. Heavy trucks use even higher pressures.

🤿

Scuba Diving

Pressure increases by **1 atm** for every 10 meters of water depth. Scuba tanks are filled to **200-300 bar**.

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Frequently Asked Questions

What is 1 Bar in PSI?
1 Bar is approximately equal to 14.50 PSI. This is a very common conversion for setting air compressor gauges or tire pumps.
Is 1 Bar equal to 1 Atmosphere?
Very close, but not exactly. 1 Atmosphere (atm) is 1.01325 Bar. For rough calculations, they are often treated as equal, but in scientific contexts, the difference matters.
What is gauge pressure vs absolute pressure?
Gauge pressure (psig) measures pressure relative to the ambient atmosphere (zero at sea level). Absolute pressure (psia) includes atmospheric pressure (starts at true vacuum zero). Tire gauges read gauge pressure.
Why do weather reports use hPa?
hPa stands for Hectopascal. 1 hPa is exactly equal to 1 Millibar (mb). It allows meteorologists to use the metric system while keeping the numbers familiar (e.g., 1013 hPa).
What is a Torr?
A Torr is 1/760 of an atmosphere. It is historically based on "millimeters of mercury" (mmHg). It is commonly used in vacuum physics and blood pressure measurement.
How many Pascals in a PSI?
There are approximately 6,895 Pascals in 1 PSI. Since Pascal is a very small unit (about the weight of a dollar bill on a table), we often use Kilopascals (kPa).
What unit is used for blood pressure?
Blood pressure is universally measured in **mmHg** (millimeters of mercury). A standard reading is 120/80 mmHg.
Why is tire pressure lower in winter?
Pressure is directly related to temperature (Gay-Lussac's Law). As air gets colder, it contracts, lowering the PSI in your tires even if no air has leaked out.
What is standard sea level pressure?
Standard atmospheric pressure is defined as 101,325 Pa, 1013.25 hPa, 1 atm, or 14.696 psi.
How accurate is this converter?
This tool uses high-precision floating point math with conversion factors up to 9 decimal places (e.g., 1 atm = 101325 Pa exactly).