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.