Convert Between Pressure Units Instantly Convert between Pascal, kilopascal, bar, atmosphere, PSI, mmHg, and Torr pressure units.

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Pressure Converter

Convert between Pascal, kilopascal, bar, atmosphere, PSI, mmHg, and Torr pressure units.

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What Is Pressure Converter?

A pressure converter translates force-per-area measurements between different unit systems. Pressure is defined as force applied per unit area. The Pascal (Pa), the SI unit, equals one newton per square meter — a very small unit, so kilopascals (kPa) and bars are more practical for everyday use. PSI (pounds per square inch) dominates in the US for tire pressure and industrial applications. The atmosphere (atm) represents standard atmospheric pressure at sea level. Millimeters of mercury (mmHg) and Torr are essentially identical and are used in medicine (blood pressure) and vacuum systems. This converter handles seven common pressure units used across engineering, meteorology, medicine, and industry.

Why Use Pressure Converter?

Covers seven essential pressure units for engineering, medicine, and weather.
Real-time bidirectional conversion.
Critical for tire pressure, blood pressure, and industrial specifications.
Uses exact SI-defined conversion factors.
Quick reference for common pressure values.

Common Use Cases

Automotive

Convert tire pressure between PSI, bar, and kPa.

Medicine

Translate blood pressure readings from mmHg to Pa or kPa for research contexts.

Engineering

Switch between SI (Pa, kPa) and imperial (PSI) units in technical specifications.

Meteorology

Check atmospheric pressure in mbar, hPa, mmHg, or inHg depending on regional conventions.

Technical Guide

All conversions use the Pascal (Pa) as the base unit. Key relationships:
• 1 kPa = 1,000 Pa
• 1 bar = 100,000 Pa (close to 1 atmosphere)
• 1 atm = 101,325 Pa (standard atmosphere, defined exactly)
• 1 PSI = 6,894.757 Pa
• 1 mmHg = 133.322 Pa (at 0°C)
• 1 Torr ≈ 1 mmHg (within 0.000015%)
The atmosphere (atm) was originally defined as the pressure exerted by a 760 mm column of mercury at 0°C at standard gravity. The modern definition is exactly 101,325 Pa. Torr is defined as exactly 1/760 of an atmosphere, which differs negligibly from mmHg.
Note: 1 bar = 100 kPa = 14.504 PSI. Many tire pressure gauges show both PSI and bar. European cars typically recommend tire pressures in bar, while US cars use PSI.

Tips & Best Practices

1
Tire pressure: typical car tires are 30-35 PSI ≈ 2.07-2.41 bar ≈ 207-241 kPa.
2
Blood pressure is always measured in mmHg. Normal is about 120/80 mmHg.
3
1 atm ≈ 1 bar ≈ 14.7 PSI ≈ 760 mmHg. These are useful landmarks.
4
In meteorology, pressure is often given in hectopascals (hPa), which equal millibars (mbar).

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Frequently Asked Questions

Q How do I convert PSI to bar?

Divide PSI by 14.504. For example, 30 PSI ≈ 2.07 bar.

Q What is standard atmospheric pressure?

Standard atmospheric pressure is exactly 101,325 Pa = 1 atm = 1.01325 bar = 14.696 PSI = 760 mmHg.

Q Is Torr the same as mmHg?

Nearly. 1 Torr is defined as exactly 1/760 atm, while 1 mmHg depends on mercury density and gravity. The difference is less than 0.002%, so they are treated as identical for practical purposes.

Q What pressure unit do weather forecasts use?

Meteorologists typically use hectopascals (hPa) or millibars (mbar), which are identical. In the US, inches of mercury (inHg) is also common.

Q How do I convert bar to PSI?

Multiply bar by 14.504. For example, 2 bar ≈ 29 PSI.

About This Tool

Pressure Converter is a free online tool by FreeToolkit.ai. All processing happens directly in your browser — your data never leaves your device. No registration or installation required.