How do I convert ksi?

Multiply the ksi figure by a thousand to get psi, then convert to MPa here. A 75 ksi tensile minimum is 75,000 psi, which comes out at about 517 MPa — the 515 MPa most standards print for the same grade.

Is the converter reading gauge or absolute pressure?

Neither — it converts the number, whichever it is. Keep the g or a suffix from the source document on the converted figure, and remember that one standard atmosphere is 1.01325 bar if you need to move between them.

Why is there no MPa to bar row?

Because the factor is exactly ten and the workbook does not carry a row for it. Shift the decimal point: 1 MPa = 10 bar, 25 bar = 2.5 MPa.

Pressure Converter — MPa, bar and psi — Hidayath Metal Industries

UNITS

Pressure

From

Value MPa

Converted value— psi

What this calculates

Pressure and stress share units, and the metal trade uses three of them side by side. Material standards give tensile and yield strength in megapascals — EN grades in MPa, ASTM grades in ksi, which is a thousand psi. Pressure vessel and piping work states design and test pressure in bar on European documents and in psi on American ones. A datasheet that says 515 MPa minimum tensile and a specification that asks for 75 ksi are asking for the same steel, and this page shows it.

The three units are related by fixed constants. One megapascal is exactly one newton per square millimetre and exactly ten bar. One psi is 6.894757 kPa, so a megapascal is 145.04 psi and a bar is 14.50 psi. The workbook lists the three rows our engineers use — MPa to psi, bar to psi and psi to bar — and the converter runs them forward, or backwards by dividing, and says which it did beneath the result.

Two readings of the same figure need care. A gauge pressure on a vessel and an absolute pressure differ by atmospheric pressure, roughly one bar, and this page does not add or remove it: it converts the number in front of you. Likewise MPa as a stress on a certificate and MPa as a pressure in a pipe are the same unit but mean different things; the converter treats them as numbers and leaves the meaning to the drawing.

Show the formula and a worked example

The formula

MPa → psi: × 145.03773773
bar → psi: × 14.503773773
psi → bar: × 0.0689475729

Dimensions in millimetres, density ρ in kg/m³ — as the engine runs them.

Each conversion multiplies by one workbook constant: MPa × 145.03773773 = psi, bar × 14.503773773 = psi, psi × 0.0689475729 = bar. Going the other way, from psi to MPa for instance, divides by the same constant and is marked as run backwards. The workbook carries no MPa-to-bar row because the factor is exactly ten; multiply or divide by ten yourself.

The constants are rounded to ten significant figures. That is far beyond the precision of any pressure gauge or tensile test, so the converted figure is limited by the number you typed, not by the constant.

Worked example

Worked example — Pressure Converter
Quantity	Pressure
Value	1 MPa
To	psi
Theoretical result	145.04 psi

Computed by the calculation engine from these inputs at render time, rounded only for display.

Frequently asked

01How do I convert ksi?: Multiply the ksi figure by a thousand to get psi, then convert to MPa here. A 75 ksi tensile minimum is 75,000 psi, which comes out at about 517 MPa — the 515 MPa most standards print for the same grade.
02Is the converter reading gauge or absolute pressure?: Neither — it converts the number, whichever it is. Keep the g or a suffix from the source document on the converted figure, and remember that one standard atmosphere is 1.01325 bar if you need to move between them.
03Why is there no MPa to bar row?: Because the factor is exactly ten and the workbook does not carry a row for it. Shift the decimal point: 1 MPa = 10 bar, 25 bar = 2.5 MPa.

Pressure Converter