Pound/sq inch to Millibar Converter
Convert Pound/sq inch (psi) to Millibar (mbar) instantly. 1 psi = 68.947573 mbar.
Pressure Converter
29 units available
1 psi = 68.947573 mbar
Formula:
mbar = psi × 68.9475729317With your value: 1 psi = 68.94757293 mbar
Other Pound/sq inch to Millibar conversions
Pound/sq inch to Millibar Conversion Table
| Pound/sq inch (psi) | Millibar (mbar) |
|---|---|
| 0.5 | 34.473786 |
| 1 | 68.947573 |
| 2 | 137.895146 |
| 5 | 344.737865 |
| 10 | 689.475729 |
| 15 | 1,034.213594 |
| 20 | 1,378.951459 |
| 25 | 1,723.689323 |
| 50 | 3,447.378647 |
| 100 | 6,894.757293 |
| 250 | 17,236.893233 |
| 500 | 34,473.786466 |
| 1000 | 68,947.572932 |
Millibar to Pound/sq inch Conversion Table
| Millibar (mbar) | Pound/sq inch (psi) |
|---|---|
| 0.5 | 0.007252 |
| 1 | 0.014504 |
| 2 | 0.029008 |
| 5 | 0.072519 |
| 10 | 0.145038 |
| 15 | 0.217557 |
| 20 | 0.290075 |
| 25 | 0.362594 |
| 50 | 0.725189 |
| 100 | 1.450377 |
| 250 | 3.625943 |
| 500 | 7.251887 |
| 1000 | 14.503774 |
Where these values come from
Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.
Pound/sq inch (psi)
Pressure
1 psi = 1 lbf/in² = 6894.757 293 168 361 Pa exactly.
Source: NIST Special Publication 811, Guide for the Use of the International System of Units
National Institute of Standards and Technology (US) · Reviewed 2026-07-01
Millibar (mbar)
Pressure
Derived from the pascal (1 Pa = 1 N/m²). The standard atmosphere is exactly 101 325 Pa.
Source: NIST Special Publication 811, Guide for the Use of the International System of Units
National Institute of Standards and Technology (US) · Reviewed 2026-07-01
How to Convert Pound/sq inch to Millibar
To convert from Pound/sq inch (psi) to Millibar (mbar), multiply the value by 68.9475729317.
Formula: mbar = psi × 68.9475729317
Reverse: psi = mbar × 0.0145037738
Step-by-Step Example
- Start with your value in Pound/sq inch. For example: 5 psi
- Multiply by the conversion factor: 5 x 68.9475729317
- The result is: 344.737865 mbar
About Pound/sq inch
Pounds per square inch (psi) is an imperial unit of pressure widely used in the US for tire pressure, hydraulics, and engineering.
Common uses: tire pressure (US), hydraulics, HVAC.
About Millibar
The millibar (mbar) is a unit of pressure and stress. One millibar equals 100 pascals. UnitConvertLab converts it against every other pressure unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.
Common uses: pressure calculations, engineering and science, education.
Frequently Asked Questions
How many Millibar are in 1 Pound/sq inch?
There are exactly 68.9475729317 Millibar in 1 Pound/sq inch. This means the conversion factor from Pound/sq inch to Millibar is 68.9475729317.
What is the formula to convert Pound/sq inch to Millibar?
The formula to convert Pound/sq inch to Millibar is: mbar = psi × 68.9475729317. For example, to convert 10 Pound/sq inch to Millibar, you would multiply 10 by 68.9475729317.
What is a Pound/sq inch?
Pounds per square inch (psi) is an imperial unit of pressure widely used in the US for tire pressure, hydraulics, and engineering.
What is a Millibar?
The millibar (mbar) is a unit of pressure and stress. One millibar equals 100 pascals. UnitConvertLab converts it against every other pressure unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.
What are the common uses of Pound/sq inch?
The Pound/sq inch is commonly used in tire pressure (US), hydraulics, HVAC.
Related Pressure Conversions
Cite this page
UnitConvertLab. (2026). Pound/sq inch to Millibar converter. UnitConvertLab. Retrieved from https://unitconvertlab.com/convert/psi-to-millibar