Pressure unit converter
Convert pressure between PSI, bar, MPa, kPa, Pa and atmospheres in a single step — useful when the transmitter, gauge and valve on a skid each use a different unit convention. Enter any pressure once and read all six units at once.
All six units at once
Fixed conversion ratios: 1 bar = 100 kPa = 0.1 MPa ≈ 14.5038 psi ≈ 0.9869 atm = 100,000 Pa. Enter any pressure once and read every unit at once.
Field instruments are spec'd in the local convention — PSI on US equipment, bar across Europe, MPa in China. When the pressure transmitter, gauge and valve on a skid disagree on units, convert before comparing. AO Ctrl stocks pressure sensing and control gear:
Frequently asked questions
How many PSI is one bar?
One bar is about 14.5038 psi. The calculator uses exact fixed ratios: 1 bar = 100 kPa = 0.1 MPa ≈ 14.5038 psi ≈ 0.9869 atm = 100,000 Pa. It converts all six units at once from a single entry, so entering 6 bar reads about 87.0 psi, 0.6 MPa, 600 kPa, 600,000 Pa and about 5.9 atm.
How do I convert pressure between bar, MPa and kPa?
These are all SI-prefix multiples of the pascal, so the ratios are exact powers of ten: 1 MPa = 10 bar = 1000 kPa = 1,000,000 Pa. With the default 6 bar you get 0.6 MPa, 600 kPa and 600,000 Pa. Only psi and atmosphere use non-decimal factors — 1 psi = 6894.757293168 Pa and 1 atm = 101,325 Pa.
Which pressure unit should I use for a field instrument?
It depends on the regional convention: PSI on US equipment, bar across Europe, and MPa in China. When the pressure transmitter, gauge and valve on a skid each use a different unit, convert before comparing. This converter reads any of the six units once and shows all of them together, and it rejects negative pressures because gauge and absolute pressures are zero or positive.