Pressure Converter - Convert Between Different Pressure Units

There are two main ways to measure pressure:

• Absolute pressure is measured relative to a perfect vacuum (zero pressure). It's always positive.
• Gauge pressure is measured relative to atmospheric pressure. It can be positive (higher than atmospheric) or negative (lower than atmospheric).

Most pressure measurements in everyday life are gauge pressure. For example, tire pressure is typically gauge pressure. This converter works with both types, but it's important to know which one you're dealing with.

Pressure unit conversions are useful in many scenarios:

• Automotive - converting tire pressure between psi and bar
• Engineering - working with specifications in different units
• Weather forecasting - converting between millibars, inHg, and other units
• Scuba diving - converting between atmospheres, bar, and other units for understanding pressure at depth
• Industrial processes - converting between different pressure units for equipment specifications
• Scientific research - converting between units for experiment documentation

The most commonly used pressure units vary by region and application:

• In scientific and international contexts, the pascal (Pa) is the standard SI unit
• In Europe and many other countries, bar is commonly used for industrial and everyday applications
• In the US and Canada, pounds per square inch (psi) is widely used
• For weather forecasting, millibars, inHg, or mmHg are often used depending on the region
• For medical applications, mmHg is typically used for blood pressure

This pressure converter uses standard conversion factors and performs calculations with high precision. The results are accurate to multiple decimal places, with the display precision adjusted based on the magnitude of the result. For scientific or industrial applications where extreme precision is required, you may want to verify the conversion factors used.