Pressure Converter
Converts pressure between pascal, kilopascal, bar, atmosphere, PSI, and mmHg by converting through pascals as the common base unit.
What this calculator does
The Pressure Converter estimates your result instantly from the values you enter, using standard science & engineering formulas. Converts pressure between pascal, kilopascal, bar, atmosphere, PSI, and mmHg by converting through pascals as the common base unit. Calculations run in your browser, so nothing you type is sent to a server, and the output is an estimate rather than a certified or official figure.
Result
About Pressure Converter
This pressure converter changes a value among six units: pascal (Pa), kilopascal (kPa), bar, atmosphere (atm), PSI, and mmHg. It converts the input to pascals and then to the target unit.
The built-in factors are 1 kPa = 1000 Pa, 1 bar = 100000 Pa, 1 atm = 101325 Pa, 1 PSI = 6894.75729 Pa, and 1 mmHg = 133.322368 Pa.
Formula & Mathematical Calculation
Converted Value = f(Pressure value, From, To)
Calculated according to standard science formulas implemented in the calculator core.
Calculation Example
Converting 1 bar to pascals: 1 × 100000 = 100000 Pa base, then divided by 1 (Pa factor) gives 100000 Pa.
Key Benefits
- Converts among pascal, kilopascal, bar, atmosphere, PSI, and mmHg
- Routes every conversion through pascals for consistency
- Uses precise factors such as 101325 Pa per atm and 6894.75729 Pa per PSI
- Reports the converted value to six decimal places
How to Use this Calculator
-
Enter the pressure value
Type the numeric pressure in the Pressure value field. -
Choose the From unit
Select the unit your value is in from the From dropdown (Pa, kPa, bar, atm, PSI, or mmHg). -
Choose the To unit and calculate
Select the unit you want in the To dropdown, then press Calculate to see the converted value.
Assumptions & Limitations
What the calculation assumes
- Every value you enter is treated as an exact, known amount.
- Any rate or interval you enter is assumed to hold for the whole period unless the form asks for it separately.
- Results use standard published formulas and account only for the values entered above.
- Rounding is applied for display; the underlying calculation uses your full precision.
- Results are returned in the same units you enter, unless the tool states the output unit.
What it does not cover
- Pressure Converter produces a calculated result for reference and learning, not a certified or official measurement.
- Real-world outcomes differ when tolerances, rounding rules or local standards apply.
- Definitions and standards vary by region and change over time; verify the convention that applies to your case.
- Figures are only as accurate as the inputs you supply — check them before acting on the result.
- For work where the result carries real consequences, confirm it against an authoritative source.
Frequently Asked Questions
Free to use, no account needed. Calculations run in your browser, so nothing you type is sent to a server. Results are estimates — how we build and check our calculators.