OC — Online Calculator

Pressure

High Precision Engine

Convert pascals, bar, PSI, and atmospheres for engineering and lab work.

FromUnit

atmatm

01,000,000

Unit

101.325

1 atm = 101325 Pa = 1.01325 bar = 14.69594301 psi

Suggested Conversions

atm to kPa

Common Pressure units

Tap a unit to set it as your "From" unit (use the rows above for From/To shortcuts).

Conversion tips

1 bar = 100,000 Pa
1 atm = 101,325 Pa
1 PSI ≈ 6,894.76 Pa

High Precision Engine

Quick Ratio

1 atm = 101.325 kPa

Quick conversions

atm to kPa

Pressure History

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Pressure Converter

Pressure units are famously inconsistent across countries and industries. If you’re translating gauge readings or comparing datasheets, use one trusted pass through the math instead of multiple rough conversions.

Why these units exist

The pascal is one newton per square meter; the atmosphere approximates mean sea-level air pressure; bar is 100 kPa by definition. Tire PSI persists in North America even where metric dominates elsewhere.

Force spread over area

P_target = P_source × (Pa per source unit) / (Pa per target unit)

All engineering pressures normalize to pascals the way masses normalize to kilograms. Gauge vs absolute adds offsets in application, not in pure unit algebra—the tool converts unit scales.

Four ideas worth memorizing

11 bar ≈ atmospheric pressure at sea level—quick sanity on bar readings.
2PSI gauge + 14.7 ≠ absolute unless you know local atm—use instrumentation docs.
3kPa on weather maps differs from tire gauge—you still convert the number faithfully.
4Depth adds hydrostatic pressure—this page swaps units only, not fluid models.

Popular conversions on this tool

Jump straight in with common pairings—each link opens this same calculator with units and a value filled in, so you can bookmark or share it.

Where the standards come from

These are independent references—government labs, international measurement bodies, or university course materials—that explain the definitions behind the numbers. We don’t endorse third-party sites; we point to them for deeper reading.

NIST: SI pressure (pascal)NIST

How to Convert Pressure

Short version: To convert PSI to Bar, multiply by 0.0689476.

Pick your input unit (e.g., PSI).
Input the pressure value.
Choose the output unit (e.g., Bar).
The conversion factor is applied based on standard atmospheric definitions.

Examples people look up

1 atm101,325 Pa

1 Bar14.50 PSI

100 kPa1 Bar

32 PSI2.2 Bar (Tire Pressure)

Frequently asked questions

What is standard atmospheric pressure?

Standard atmospheric pressure is defined as 101,325 Pascals or 14.696 PSI.

Is 1 Bar equal to 1 Atmosphere?

They are very close. 1 Bar = 0.9869 atm.

Do I use gauge or absolute here?

This converter translates numeric pressure units. Gauge vs absolute is a physical modeling choice—subtract or add local atmospheric pressure in your engineering step after converting units.