Pressure Converter

Convert between different pressure units including pascals, bars, PSI, atmospheres, and more.

Pressure Converter
ready
$ convert --from [unit] --to [unit] --value [number]
$
>
formulas.ts

// Common Pressure Converter Formulas

1const1 atm = 101,325 pascals
2const1 bar = 100,000 pascals
3const1 psi β‰ˆ 6,894.76 pascals
4const1 mmHg β‰ˆ 133.322 pascals
references.json

// Common Pressure Converter References

{
"Standard Atmospheric Pressure":"101,325 Pa",
"Car Tire Pressure":"200-300 kPa",
"Scuba Tank Pressure":"20 MPa",
"Deep Sea Pressure":"100 MPa",
"Vacuum Chamber Pressure":"<1 Pa",
"Normal Blood Pressure":"120/80 mmHg"
}
guide.md

Pressure as force per area

Pressure units appear in weather (hectopascals), tires (psi, bar), and labs (pascals, torr). The SI unit is the pascal (N/mΒ²). Many legacy units remain because instruments and regulations still quote them.

method.ts

How conversion works

  1. Convert the input to pascals.
  2. Apply the factor for bar, psi, atm, torr, or mmHg.
  3. Note that mmHg and torr are nearly equal for most practical work but have distinct formal definitions in precision metrology.
sources.md

Sources

  • - SI Brochure: pascal as SI unit of pressure.
  • - NIST SP 811: 1 atm = 101325 Pa exactly; 1 bar = 10^5 Pa; 1 psi β‰ˆ 6894.757 Pa.
examples.md

Worked examples

Car tire: 32 psi to bar

  1. 1 psi β‰ˆ 6894.757 Pa; 32 psi β‰ˆ 220632 Pa.
  2. 1 bar = 100000 Pa, so 220632 / 100000 β‰ˆ 2.206 bar.

Result: 32 psi β‰ˆ 2.21 bar

Weather: 1013 hPa to atm

  1. 1013 hPa = 101300 Pa.
  2. 1 atm = 101325 Pa.
  3. 101300 / 101325 β‰ˆ 0.99975 atm.

Result: 1013 hPa β‰ˆ 1.000 atm (near standard)

Watch-outs

  • β€’ Gauge pressure vs absolute pressure: tire gauges often show gauge (relative to atmosphere).
  • β€’ mmH2O and mmHg are different; do not swap medical and HVAC units casually.
  • β€’ Vacuum specs may use torr; atmospheric weather uses hPa/mbar.

Uses

  • - Converting tire inflation recommendations between psi and bar.
  • - Reading barometer data in hPa vs inHg.
  • - Lab protocols that still list torr or atm.
FAQ.md

Pressure FAQ

01 Q: Is 1 bar the same as 1 atm?

No. 1 bar = 100000 Pa; 1 atm = 101325 Pa. They differ by about 1.3%.

02 Q: What is a hectopascal?

1 hPa = 100 Pa. Weather maps often use hPa, numerically equal to millibars.