Pressure Converter
Convert between different units of pressure measurement including PSI, bar, pascal, atmosphere, torr, mmHg, and more. Quick and accurate pressure conversions for engineering and scientific applications.
Conversion Settings
No value entered
Conversion Result
Conversion result will appear here
Enter a value and click "Convert" to start
Common Pressure Conversions
About Pressure Converter
A professional pressure converter that handles precise conversions between various pressure units including PSI, bar, pascal, atmosphere, torr, and mmHg. This specialized tool is designed for engineering, scientific, and industrial applications requiring accurate pressure measurements and conversions.
Why use a Pressure Converter?
Critical for engineers working with hydraulic systems, HVAC technicians calculating system pressures, and scientists conducting research requiring precise pressure measurements. Eliminates conversion errors in critical applications where incorrect pressure values could lead to safety issues or equipment failure.
Who is it for?
Essential for mechanical engineers, HVAC technicians, automotive professionals, scientists, and industrial technicians who work with pressure systems. Also valuable for students studying physics or engineering, medical professionals working with blood pressure, and anyone dealing with pneumatic or hydraulic equipment.
How to use the tool
Input your pressure value in the designated field
Select the source pressure unit from the comprehensive list
Choose your target pressure unit for conversion
View the converted result
Use the accurate pressure value for engineering calculations or system specifications
Frequently Asked Questions
How do I convert pressure units?
Enter the source value, pick the 'from' and 'to' units, and click Convert to see the result. Supports Pa, kPa, MPa, bar, mbar, atm, psi, Torr, mmHg (same as Torr), inHg, mmH₂O, inH₂O, kgf/cm², and more. Copy the converted value to clipboard. Conversion runs entirely in your browser — values never leave the device. Results are shown to up to 12 significant digits with trailing zeros removed; there is no precision setting.
What pressure units does this converter support?
Pa, kPa, MPa, bar, mbar, atm, psi, Torr, mmHg (same as Torr), inHg, mmH₂O, inH₂O, kgf/cm², and more. The set covers SI base and derived units, common imperial/US-customary units, and domain-specific units where relevant. SI prefixes (k, M, G, m, μ, n) apply where applicable. For any unit not in the list that you need converted, mention it via feedback — the unit set evolves based on user requests.
How accurate is the pressure conversion?
Conversions use the internationally-defined factors where they exist; the result is rounded to 12 significant digits for display. Conversions use exact defined factors where they exist (1 atm = 101,325 Pa exactly; 1 bar = 100,000 Pa exactly). mmHg and torr are treated as the same unit, 1 atm / 760 = 133.322368… Pa. Output is rounded to 12 significant digits for display, and there is no setting to change that.
What's the formula to convert pounds per square inch to bar?
bar = psi × 0.0689476. Tire pressure conversion (psi for US instructions, bar for European pumps), weather data (hPa for international, inches of mercury for US weather), medical devices (mmHg blood pressure). For other pressure-unit pairs, the tool applies the appropriate exact conversion factor automatically — no manual formula needed. Results are rounded to 12 significant digits, which is more than engineering specs typically need.
What's the key accuracy caveat for pressure conversion?
**Pressure units are context-dependent** — different domains use very different units. Tire pressure: psi (US) or bar (most of the world). Weather: hPa or mbar (1 hPa = 1 mbar). Blood pressure: mmHg. Scientific work: Pa (SI) or atm (1 atm = 101,325 Pa exactly). Vacuum measurement: torr. **Gauge vs absolute pressure** — 'gauge' pressure is relative to atmospheric (your tire reads 32 psi gauge); 'absolute' is relative to vacuum (32 psi gauge + 14.7 psi atmosphere = 46.7 psi absolute).
What's a common real-world use case for pressure conversion?
Tire pressure conversion (psi for US instructions, bar for European pumps), weather data (hPa for international, inches of mercury for US weather), medical devices (mmHg blood pressure).
What pressure units are commonly confused?
**psi vs bar vs atm** — 1 atm ≈ 1.01 bar ≈ 14.7 psi (close but not identical). **'mmHg' vs 'torr'** — treated as identical in this tool (both are 101,325/760 Pa); torr is the modern scientific name. **Gauge vs absolute** — different reference points; always note which one the application expects.
How do I handle very large or very small pressure values?
Use SI prefixes for clean scaling: kilo (10³), mega (10⁶), giga (10⁹), milli (10⁻³), micro (10⁻⁶), nano (10⁻⁹). For very large or very small results, the tool switches to exponent notation (e.g. 1.23e15) at 1e15 and above or below 1e-9. Conversions use exact defined factors where they exist (1 atm = 101,325 Pa exactly; 1 bar = 100,000 Pa exactly). mmHg and torr are treated as the same unit, 1 atm / 760 = 133.322368… Pa. For data interchange, copy the value; it is shown to 12 significant digits.
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