Online Pressure Unit Converter

Quickly and accurately convert the working pressure of hoses, fittings and hydraulic/pneumatic equipment between bar, PSI, MPa, kgf/cm², atmosphere, meters of water, inHg and mmHg — based on standard engineering conversion factors.

Pressure value

Input unit

Calculated using standard SI engineering constants (1 bar = 100,000 Pa, 1 atm = 101,325 Pa). For critical working pressures, always verify the calculated value against the technical catalog of the specific hose or fitting series.

Why pressure unit conversion matters in hose selection

Different hose and fitting standards report working and burst pressure in different units: European catalogs typically use bar or MPa, SAE/API standards use PSI, and some diesel and instrumentation specifications use atmosphere or kgf/cm². When your system's working pressure is specified in one unit, an incorrect conversion to another can lead to selecting an unsuitable hose grade — either under-rated or unnecessarily over-specified. For example, 20 bar equals approximately 290 psi, not 30 psi — a unit-conversion error at this scale can result in a hose grade completely mismatched to your system.

Pressure unit reference table

Bar	PSI	MPa	atm	kgf/cm²	mH2O	inHg	mmHg
1	14.50	0.10	0.987	1.020	10.20	29.53	750.06
5	72.52	0.50	4.935	5.099	50.99	147.65	3750.3
10	145.04	1.00	9.869	10.197	101.97	295.30	7500.6
20	290.08	2.00	19.74	20.394	203.94	590.60	15001
100	1450.4	10.0	98.69	101.97	1019.7	2953.0	75006
350	5076.3	35.0	345.4	356.9	3569.0	10336	262522

Source: Base pressure unit conversion factors calculated per the SI system (1 bar = 100,000 Pa, 1 standard atmosphere = 101,325 Pa) and cross-checked against the pressure conversion table (Table 2) and unit conversion factors (Table 3) in the official Balflex technical catalog.

Common pressure units in oil, gas & petrochemical industries

Bar: common in European hydraulic and pneumatic hose catalogs; close to atmospheric pressure (1 bar ≈ 1 atm).
PSI: standard unit in SAE, API and most US drilling and well-control equipment specifications.
MPa: official SI unit, widely used in ISO standards and flange specifications (e.g. Code 61 = SAE 3000 psi ≈ 20.7 MPa).
kgf/cm²: still used in some industrial valve and equipment specifications (particularly from Asian sources); approximately equal to 1 atmosphere.

Related: For selecting the right hose material based on chemical compatibility with your fluid, see the Hose Fluid Compatibility Guide.

Have your system's working pressure and need the right hose grade?

Send us the working pressure (in any unit) and fluid type, and our technical team will recommend the correct hose grade per standard.

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