PSI to BarFree online conversion calculator — instant results, no sign-up
Convert pounds per square inch to bar and back.
About the PSI to Bar
The PSI to Bar calculator converts pressure from pounds per square inch (psi) to bar and provides the reverse conversion relationship. With the default input of 1 psi, it displays 0.068948 bar. Use it to compare pressure readings or specifications expressed in these two units.
- Value in psi (psi)
- The pressure to convert, measured in pounds per square inch (psi), with a default value of 1.
Formula and method
P_bar = P_psi × 0.06894757293168; reverse: P_psi = P_bar ÷ 0.06894757293168. Rounded to six decimal places: 1 psi = 0.068948 bar and 1 bar = 14.503774 psi.
- P_psiPressure expressed in pounds per square inch.
- P_barThe same pressure expressed in bar.
Multiply the entered psi value by approximately 0.06894757293168 to obtain bar, then round the displayed result to six decimal places. For the default input, 1 psi produces bar = 0.068948. The reciprocal factor gives the reverse relationship, displayed as 1 bar = 14.503774 psi.
Worked example
These are the calculator's starting values and the results it actually produces for them.
Inputs
- Value in psi1 psi
Results
- bar0.068948
- 1 psi =0.068948 bar
- 1 bar =14.503774 psi
How to use the PSI to Bar
- 1Enter the pressure in the Value in psi (psi) field, or leave the default value of 1.
- 2Read the calculated bar result; the default input gives bar = 0.068948.
- 3Check the forward equivalence row, which shows 1 psi = 0.068948 bar for the default input.
- 4Read the reverse equivalence row, 1 bar = 14.503774 psi, when you need the bar-to-psi relationship.
- 5For a reverse calculation, multiply a pressure in bar by the unrounded reciprocal conversion factor.
Reading your result
The bar result row is the entered pressure converted to bar: bar = 0.068948 for the default input. The forward equivalence row, shown as “1 psi = = 0.068948 bar,” states the same conversion with both units. The reverse row, shown as “1 bar = = 14.503774 psi,” gives the psi equivalent of one bar rather than a second conversion of the entered value. The doubled equals signs are display formatting; read each as a single equals sign.
Limitations
Displayed results are rounded, so converting a rounded result back may not reproduce the original value exactly. This is a unit conversion only: it does not change gauge pressure into absolute pressure or account for atmospheric pressure. Keep the same pressure reference on both sides of the conversion. The supplied input is in psi; the reverse relationship is provided without a separate bar input.
Common questions
How many bar is the default input of 1 psi?+
The calculator displays 0.068948 bar, rounded to six decimal places.
How do I convert bar back to psi?+
Divide the bar value by approximately 0.06894757293168. The displayed reverse relationship is 1 bar = 14.503774 psi; using the full factor reduces rounding error.
Does converting psi to bar also convert gauge pressure to absolute pressure?+
No. A gauge-pressure input remains gauge pressure after conversion, and an absolute-pressure input remains absolute pressure. Changing the pressure reference requires a separate adjustment using the applicable atmospheric pressure.
Why should I avoid using 0.068948 as the conversion factor for further calculations?+
It is the rounded display value for one psi. Using the more precise factor before rounding the final result avoids accumulating unnecessary rounding error.
Does the calculator save my information?+
Calculations run in your browser. While signed in, inputs and results are automatically recorded in account history; saving a result creates a separate saved record.
Further reading
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Results are estimates for informational purposes and are not financial, medical or legal advice.