Pressure and stress unit converter

Convert between Pa, kPa, MPa, bar, mbar, psi and more, with formulas and tables.

Popular pressure and stress conversions

Conversion matrix

Each cell is how many of the column unit equal 1 of the row unit. Tap a value for the full table.

	Pa	kPa	MPa	bar	mbar	psi	ksi	atm	mmHg	inHg	inH2O	kgf/cm²	Torr
1 Pa	1	0.001	1 × 10^-6	1 × 10^-5	0.01	0.000145038	1.45038 × 10^-7	9.86923 × 10^-6	0.00750062	0.0002953	0.00401474	1.01972 × 10^-5	0.00750062
1 kPa	1,000	1	0.001	0.01	10	0.145038	0.000145038	0.00986923	7.50062	0.2953	4.01474	0.0101972	7.50062
1 MPa	1,000,000	1,000	1	10	10,000	145.038	0.145038	9.86923	7,500.62	295.3	4,014.74	10.1972	7,500.62
1 bar	100,000	100	0.1	1	1,000	14.5038	0.0145038	0.986923	750.062	29.53	401.474	1.01972	750.062
1 mbar	100	0.1	0.0001	0.001	1	0.0145038	1.45038 × 10^-5	0.000986923	0.750062	0.02953	0.401474	0.00101972	0.750062
1 psi	6,894.76	6.89476	0.00689476	0.0689476	68.9476	1	0.001	0.068046	51.7149	2.03602	27.6807	0.070307	51.7149
1 ksi	6,894,757.2931679999	6,894.76	6.89476	68.9476	68,947.6	1,000	1	68.046	51,714.9	2,036.02	27,680.7	70.307	51,714.9
1 atm	101,325	101.325	0.101325	1.01325	1,013.25	14.6959	0.0146959	1	760	29.9213	406.794	1.03323	760
1 mmHg	133.322	0.133322	0.000133322	0.00133322	1.33322	0.0193368	1.93368 × 10^-5	0.00131579	1	0.0393701	0.535255	0.00135951	1
1 inHg	3,386.39	3.38639	0.00338639	0.0338639	33.8639	0.491154	0.000491154	0.0334211	25.4	1	13.5955	0.0345315	25.4
1 inH2O	249.082	0.249082	0.000249082	0.00249082	2.49082	0.0361263	3.61263 × 10^-5	0.00245825	1.86827	0.0735539	1	0.00253993	1.86827
1 kgf/cm²	98,066.5	98.0665	0.0980665	0.980665	980.665	14.2233	0.0142233	0.967841	735.559	28.959	393.712	1	735.559
1 Torr	133.322	0.133322	0.000133322	0.00133322	1.33322	0.0193368	1.93368 × 10^-5	0.00131579	1	0.0393701	0.535255	0.00135951	1

The units

Pa (pascal): The SI unit of pressure: one newton per square metre.
kPa (kilopascal): Common for HVAC, building ventilation and low-pressure gas work.
MPa (megapascal): Standard for material strength, hydraulics and pressure vessels; equal to 1 N/mm².
bar (bar): Close to one atmosphere; widely used for industrial and pneumatic gauges outside the US.
mbar (millibar): Used for weather, vacuum and low differential pressures.
psi (pounds per square inch): US customary pressure: tires, compressed air, hydraulics and water supply.
ksi (kilopounds per square inch): US structural and material strength: 1 ksi = 1,000 psi.
atm (standard atmosphere): Defined as 101,325 Pa, roughly sea-level air pressure.
mmHg (millimetres of mercury): Blood pressure and vacuum gauges, using the conventional 13.5951 g/cm³ mercury.
inHg (inches of mercury): Barometric pressure in US aviation and weather reports.
inH2O (inches of water column): Low duct and furnace pressures, at the conventional 4 °C water reference.
kgf/cm² (kilograms-force per square centimetre): Older metric industrial gauges; about 0.98 bar.
Torr (torr): Vacuum technology: 1/760 of a standard atmosphere.

Gauge pressure (psig, barg) is measured relative to the surrounding atmosphere; absolute pressure (psia, bara) is relative to vacuum. Converting units never changes that reference: absolute = gauge + about 14.696 psi (1.01325 bar) at sea level. Stress uses the same units: 1 MPa = 1 N/mm².

Pressure and stress unit converter

Popular pressure and stress conversions

Conversion matrix

The units

All pressure and stress conversions