Millibars to PSI Converter

One Millibar equals 0.01450377377 PSI (1 mbar = 0.01450377377 psi). Multiply a Millibar value by 0.01450377377 to get the equivalent in PSI. Use the calculator above for your value, or check the examples and reference table below.

Formula

psi = mbar × 0.01450377377

Multiply the Millibar value by 0.01450377377 to get the equivalent value in PSI.

Example Conversions

1 Millibar (mbar)

0.01450377377 PSI (psi)

5 Millibar (mbar)

0.07251886887 PSI (psi)

10 Millibar (mbar)

0.1450377377 PSI (psi)

25 Millibar (mbar)

0.3625943443 PSI (psi)

100 Millibar (mbar)

1.450377377 PSI (psi)

Conversion Table

Common conversion values from Millibar to PSI
Millibar (mbar)PSI (psi)
0.10.001450377377
0.50.007251886887
10.01450377377
20.02900754755
50.07251886887
100.1450377377
250.3625943443
500.7251886887
1001.450377377
2503.625943443
5007.251886887
100014.50377377

How to Convert Manually

Use these steps to convert Millibar values to PSI without the calculator.

  1. Write down the value in Millibar (mbar) that you want to convert.
  2. Multiply that value by 0.01450377377.
  3. For example, 10 Millibars × 0.01450377377 = 0.1450377377 PSI.
  4. Label the result as PSI (psi).

Relative Size Comparison

1 Millibar
1 PSI68.94757293 Millibars
1 psi

This chart shows the visual difference in size between exactly one Millibar and one PSI.

About Millibar and PSI

The millibar is one thousandth of a bar, identical to the hectopascal. Meteorology has used millibars for surface pressure maps and storm intensity for a century. The pound per square inch is about 6,894.757 pascals. US tire pressures, water systems, and industrial equipment are rated in psi. One Millibar equals 0.01450377377 PSI (1 mbar = 0.01450377377 psi). Millibar is used in weather maps and forecasts and in hurricane intensity reporting. PSI is used in US tire pressure.

Precision and Rounding:Several pressure factors are exact by definition (1 atm = 101,325 Pa; 1 bar = 100,000 Pa) while others, like psi and mmHg, are derived and carry long decimals. Tire and weather readings tolerate whole-number rounding; calibration, medicine, and process engineering need the full factor before rounding.

Use the pressure conversion guide to compare mmHg, mbar, inHg, kPa, Pa, and torr across medical, weather, aviation, vacuum, and engineering work.

Conversion factors per NIST Special Publication 811 and the BIPM SI Brochure (9th edition) (reference).

Worked Example

15Millibars equals0.2175566066PSI.

15 mbar × 0.01450377377 = 0.2175566066 psi

FAQ

How do I convert Millibar to PSI?

Multiply the Millibar value by 0.01450377377 to get the equivalent value in PSI.

What is the formula for Millibar to PSI?

The formula is psi = mbar × 0.01450377377.

How many PSI are in 1 Millibar?

1 Millibar equals 0.01450377377 PSI.

Can I convert PSI back to Millibar?

Yes. 1 PSI equals 68.94757293 Millibars, and the related converter can reverse the calculation.

What are common names for Millibar and PSI?

Millibar is shown as mbar and may also be searched as millibars, mb. PSI is shown as psi and may also be searched as pounds per square inch, lbf/in².

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