THE NUMORIX GUIDE
How to use the Pressure Converter
Last reviewed September 14, 2026
What this calculator does
The converter normalizes the source value to pascals and divides by the destination factor.
Formula and method
The converter normalizes the source value to pascals and divides by the destination factor. It uses 1 kPa = 1,000 Pa, 1 MPa = 1e6 Pa, 1 bar = 100,000 Pa, 1 psi = 6,894.757 Pa, 1 atm = 101,325 Pa, 1 mmHg = 1 torr = 133.3224 Pa, and 1 inHg = 3,386.389 Pa.
Variables and inputs
Enter a numeric pressure and choose Pa, kPa, MPa, bar, psi, atm, mmHg, inHg, or torr. The interface displays every unit after conversion and uses up to eight significant digits. It does not ask whether the input is gauge or absolute pressure.
Worked example
For 1 atm, the engine computes 1 x 101,325 = 101,325 Pa, which is 101.325 kPa, 1.01325 bar, about 14.6959 psi, and approximately 760 mmHg or torr.
How to interpret the result
Pressure is force distributed over area, so the same pressure can be represented in several units. A unit conversion does not change the reference: gauge pressure remains gauge and absolute pressure remains absolute.
Common mistakes to avoid
Do not confuse gauge pressure with absolute pressure, and do not add atmospheric pressure merely because the result is shown in atm. Use force per square meter for pascals, distinguish mmHg from inHg, and avoid treating a pressure unit as a force unit.
Assumptions and limitations
The factors for psi, mmHg, inHg, and torr are fixed rounded or conventional values in the engine. The UI allows zero, negative, or nonphysical inputs and does not model altitude, fluid columns, temperature, calibration, pressure gradients, or a measurement reference.