Pressure unit converter
Convert pressure between psi, kPa, bar, inHg, inH₂O and more. Every factor is derived from SI definitions, so the conversion is exact apart from floating point.
Pressure · unit conversion
v0.1.0 · NIST SP 811Converted value689.47573 kPa1 psi = 6894.757293168361 Pa · 1 kPa = 1000 Pa
value_to = value_from × factor_from ÷ factor_to · factors from SI definitions
Test vectors for this tool
The reference cases this calculator is tested against on every change. Use them to check your own software. All test vectors · Download JSON
| ID | Inputs | Expected | Tolerance | Source |
|---|---|---|---|---|
| PRS-01 | value = 100, from = psi, to = kPa | 689.4757293 kPa | ± 5e-8 | NIST SP 811: 1 psi = 6.894 757 293 kPa (derived from the definitions of the pound, inch and standard gravity) |
| PRS-02 | value = 1, from = atm, to = psi | 14.69594878 psi | ± 5e-9 | 101 325 Pa ÷ 6 894.757 293 Pa |
| PRS-03 | value = 1, from = bar, to = psi | 14.50377377 psi | ± 5e-9 | 100 000 Pa ÷ 6 894.757 293 Pa |
| PRS-04 | value = 1, from = inHg, to = Pa | 3386.38864 Pa | ± 0.000005 | Conventional: 0.0254 m × 13 595.1 kg/m³ × 9.806 65 m/s² |
| PRS-05 | value = 1, from = inH2O, to = Pa | 249.08891 Pa | ± 0.000005 | Conventional: 0.0254 m × 1000 kg/m³ × 9.806 65 m/s² |
| PRS-06 | value = 760, from = torr, to = atm | 1 atm | ± 1e-12 | Definition: 760 torr = 1 atm |
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