Pressure Conversion Calculator

Pressure Conversion Calculator. Pressure is measured in many different units across science, engineering, and everyday life — the Pressure Conversion Calculator converts any pressure value between ten common units in seconds. Enter your Value to Convert, then select your From and To units — choosing from atm, Pa, kPa, bar, mbar, psi, mmHg, Torr, inHg, and ksi — to get the Converted Value along with the Conversion Formula used. Also try the calculate Concentration Unit Converter Converted Value.

Value to Convert *

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Results

Converted Value

Conversion Formula

What is the difference between atmosphere (atm) and bar?

One atmosphere (atm) equals 1.01325 bar. Atmosphere is based on Earth's average atmospheric pressure at sea level, while bar is a metric unit where 1 bar equals 100,000 Pascals. See also our calculate Converted Volume & Conversion Formula — Volume Conversion (Chemistry).

How do I convert PSI to bar?

To convert PSI to bar, multiply the PSI value by 0.0689476. For example, 14.7 PSI × 0.0689476 = 1.01325 bar (which equals 1 atmosphere).

What is the relationship between mmHg and Torr?

mmHg (millimeters of mercury) and Torr are essentially the same unit. 1 Torr = 1 mmHg = 133.322 Pascals. The Torr is named after physicist Evangelista Torricelli.

Why are there so many pressure units?

Different industries use different pressure units based on convenience and historical reasons. For example, meteorology uses mmHg or mbar, engineering uses PSI or bar, and physics uses Pascals.

What is standard atmospheric pressure?

Standard atmospheric pressure is 1 atmosphere (atm) = 101,325 Pascals = 1.01325 bar = 14.696 PSI = 760 mmHg = 760 Torr. This is the average pressure at sea level.

How accurate is this pressure converter?

This calculator uses precise conversion factors and provides results accurate to 6 decimal places. The conversion factors are based on internationally recognized standards. You might also find our Temperature Conversion Calculator useful.