Pressure Converter

Convert pressure between pascal, kilopascal, atmosphere, bar, mmHg, psi and torr — the units a gas-law question mixes.

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How it converts

Result = value × (factor of the unit you convert from) ÷ (factor of the unit you convert to), every factor being the size of the unit in Pa:
1 kPa = 1000 Pa
1 atm = 101325 Pa
1 bar = 100000 Pa
1 mmHg = 133.322 Pa
1 psi = 6894.76 Pa
1 torr = 133.322 Pa

Worked example

1 atm = 1 × 101325 ÷ 133.322 = 760.002 mmHg.

Quick reference

1 Pa = 0.001 kPa = 9.869233 × 10^-6 atm = 1 × 10^-5 bar = 0.0075 mmHg = 1.450377 × 10^-4 psi = 0.0075 torr
1 atm = 101325 Pa = 101.325 kPa = 1.01325 bar = 760.002 mmHg = 14.6959 psi = 760.002 torr
1 mmHg = 133.322 Pa = 0.13332 kPa = 0.00132 atm = 0.00133 bar = 0.01934 psi = 1 torr

From the Knowledge Base

2.00 mol of a gas occupies 10.0 L at 300 K. Find the pressure in atm.

Units are litres and we want atm, so R = 0.0821 L atm K⁻¹ mol⁻¹.

P = nRT / V = (2.00 × 0.0821 × 300) ÷ 10.0
0.0821 × 300 = 24.63
24.63 × 2.00 = 49.26
P = 49.26 ÷ 10.0 = 4.93 atm

Quoted from Ideal Gas Law PV = nRT — Units, R Values and Solved Problems.

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About this converter

One of the unit converters in the Chemistry Calculator Suite, alongside its chemistry, physics and maths tools. Nothing is behind a login and no value you type is sent anywhere — the conversion runs in your own browser.

The Pressure converter above is the live tool — it converts right here on the page. The link under it opens the full suite with this set already selected.

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