Pressure is force per unit area — typically newtons per square meter, which equals one pascal (Pa). Different industries adopted different units for historical and practical reasons: tire pressure uses PSI in the US and bar in Europe, weather forecasts use millibars or inches of mercury, scuba diving uses atmospheres, and vacuum systems use Torr.
Common Conversion Formulas
bar → PSI: multiply by 14.5038
PSI → bar: multiply by 0.06895
atm → PSI: multiply by 14.696
atm → kPa: multiply by 101.325
MPa → PSI: multiply by 145.038
mmHg → Pa: multiply by 133.322
kPa → PSI: multiply by 0.14504
Quick Reference Table
From
To
Value
1 atm
PSI
14.696
1 atm
bar
1.01325
1 atm
kPa
101.325
1 atm
mmHg
760
1 bar
PSI
14.5038
1 MPa
PSI
145.038
1 PSI
kPa
6.895
Common Use Cases
Automotive: Tire inflation in PSI or bar, oil-pressure gauges, hydraulic systems.
Meteorology: Atmospheric pressure in hPa/mbar (1 hPa = 1 mbar = 100 Pa) or inHg.
Medical: Blood pressure in mmHg (e.g., 120/80), oxygen-tank pressure in PSI or bar.
Engineering: Material tensile strength in MPa, hydraulic pressure in bar or MPa.
Scuba diving: Tank pressure in bar or PSI, depth-equivalent pressure in atm.
Vacuum technology: Torr and mbar for vacuum chambers and pumps.
Pressure Converter is a free browser tool from SimpleCounter. Free pressure converter. Convert Pascal, bar, PSI, atmosphere, torr, mmHg instantly online. Enter your values and the result updates as you type — there is nothing to install and no account to create.
Definition: Pressure Converter
A pressure converter takes the numbers you enter and returns the result using the standard formula for that calculation, so you do not have to work it out by hand.
Key facts
Key facts about Pressure Converter
Cost
Free, with no account and no usage limit.
Where the maths happens
In your browser. The values you type are not sent to a server.
Devices
Any modern browser on phone, tablet, laptop or desktop.
Accuracy
Standard published formulas, shown with the units you selected.
Intended use
Estimates for everyday and educational use, not professional advice.
How to use the pressure converter
Type your value into the first field.
Choose the unit or option that matches your figures, if the tool offers a choice.
Read the result — it recalculates immediately, with no submit button.
Change any input to compare a second scenario side by side.
Disclaimer: This tool is provided for educational and informational purposes only. Results are estimates based on standard formulas and the inputs you provide. For financial, medical, legal, or tax decisions, consult a qualified professional. See our full disclaimer.
Frequently Asked Questions
How many PSI are in 1 atmosphere?
1 standard atmosphere (atm) equals approximately 14.696 PSI, or 101,325 Pa, or 1.01325 bar. Atmospheric pressure at sea level is roughly this value.
How do you convert bar to PSI?
Multiply bar by 14.5038. Example: 2 bar × 14.5038 ≈ 29.01 PSI. To convert PSI to bar, multiply by 0.0689.
What is normal tire pressure in different units?
A typical passenger-car tire pressure of 32 PSI equals about 2.21 bar, 220.6 kPa, or 1.66 atm.
What's the difference between bar and Pascal?
1 bar equals exactly 100,000 Pascals (100 kPa). The bar is slightly smaller than 1 atm. Pascal is the SI unit; bar is widely used in engineering and weather because the numbers are more convenient.
What is mmHg and where is it used?
mmHg (millimeters of mercury), also called Torr, is the pressure that supports a 1 mm column of mercury. It's used in medicine for blood pressure (120/80 mmHg) and in vacuum technology. 1 mmHg ≈ 133.322 Pa.
What pressure is a vacuum?
Perfect vacuum is 0 Pa. 'Rough vacuum' is roughly 1,000 Pa down to 1 Pa; 'high vacuum' goes down to about 10⁻⁷ Pa. Anything below 1 atm is technically a partial vacuum.
How much is 1 MPa in PSI?
1 MPa equals approximately 145.04 PSI. This unit is common in materials science for tensile strength and in hydraulic systems.
Benefits of using the Pressure Converter
What you actually get compared with a mechanical clicker, a notes app, or trying to hold the number in your head.
Nothing to install, nothing to sign up for
Open the pressure converter and start counting in the same second. No account, no email, no trial.
Your count survives real life
Totals are saved on your device as you go, so a locked screen, a closed tab, or a lost signal does not reset anything.
Works offline once loaded
Install it to your home screen and it keeps working in a warehouse, a pool hall, a field, or a plane — no connection needed.
Private by default
Counts stay in your browser. There is no cloud sync, no profile, and nothing about what you count is sent to us.
Free, with no sign-up
Works offline once loaded
Counts stay on your device
Installable as an app
Runs in your browser — nothing to download
72+ counter types available
Share your setup
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