Pressure Unit Converter
Convert pressure between pascal (Pa), kilopascal (kPa), bar, millibar (mbar), psi, standard atmosphere (atm), torr/mmHg and more. Fast, accurate online pressure unit converter with formulas and examples.
Full original guide (expanded)
Pressure Unit Converter
Convert between the most used pressure units in engineering and science: pascal (Pa), kilopascal (kPa), bar, millibar (mbar), psi, atmosphere (atm), and torr/mmHg. We use pascal as the internal base so results are consistent across all units.
Converted 1 bar → 14.5038 psi
Result
14.503774
Common reference values
| Description | Pa | bar | psi | atm |
|---|---|---|---|---|
| Standard atmosphere | 101325 | 1.01325 | 14.6959 | 1 |
| 1 bar | 100000 | 1 | 14.5038 | 0.9869 |
| Tyre pressure (2.4 bar) | 240000 | 2.4 | 34.809 | 2.37 |
How it works
Every pressure you enter is first converted to pascal (Pa). Then we divide by the target unit’s factor. This avoids rounding chains like “bar → psi → kPa” and keeps the result clean.
Base factors
1 Pa = 1 Pa
1 kPa = 1,000 Pa
1 MPa = 1,000,000 Pa
1 bar = 100,000 Pa
1 mbar = 100 Pa
1 atm = 101,325 Pa
1 psi = 6,894.757293168 Pa
1 torr (mmHg) = 133.322368 Pa
1 inHg = 3,386.389 Pa
1 inH₂O = 249.0889 Pa
Formula
\( \text{target} = \text{value} \times \frac{\text{Pa of source}}{\text{Pa of target}} \)
Example
Convert 500 kPa to psi:
500 kPa = 500,000 Pa. psi = 500,000 / 6,894.75729 = 72.52 psi.
Formula (LaTeX) + variables + units
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1 Pa = 1 Pa 1 kPa = 1,000 Pa 1 MPa = 1,000,000 Pa 1 bar = 100,000 Pa 1 mbar = 100 Pa 1 atm = 101,325 Pa 1 psi = 6,894.757293168 Pa 1 torr (mmHg) = 133.322368 Pa 1 inHg = 3,386.389 Pa 1 inH₂O = 249.0889 Pa
- No variables provided in audit spec.
- NIST — Weights and measures — nist.gov · Accessed 2026-01-19
https://www.nist.gov/pml/weights-and-measures - NIST — SI units — nist.gov · Accessed 2026-01-19
https://www.nist.gov/pml/owm/metric-si/si-units
Last code update: 2026-01-19
- Initial audit spec draft generated from HTML extraction (review required).
- Verify formulas match the calculator engine and convert any text-only formulas to LaTeX.
- Confirm sources are authoritative and relevant to the calculator methodology.