A millibar is 100 pascals.
Millibars to Micropascals Converter — mbar to uPa
Convert Millibar (mbar) to Micropascal (uPa) using the exact conversion factor (1 millibar = 100,000,000 micropascal). See the formula, worked examples, and conversion table.
Millibars to Micropascals converter
Converter
Pressure Converter
Convert pascals, bars, PSI, atmospheres, mercury columns, water columns, and engineering pressure units.
Context values
Some unit families need one extra value for a physically accurate result.
Micropascal is 0.000001 pascal units.
Result = input x 100 / 1e-6.
Pressure uses the pascal as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Millibars to Micropascals
Millibar and Micropascal both show up on pressure gauges — psi is standard on US tire and tool specifications, while bar is the everyday pressure unit across most of the rest of the world. Specifically: A millibar is 100 pascals, and micropascal is 0.000001 pascal units.
Formula
micropascals = millibars × 100000000
This factor comes from each unit's defined relationship to the category's base unit: 1 millibar equals 100 base units, and 1 micropascal equals 0.000001 base units, so dividing one by the other gives the direct millibar-to-micropascal factor of 100000000.
Simple example
1 mbar × 100000000 = 100,000,000 uPa
1 millibar = 100,000,000 micropascals.
Real-world example
35 mbar × 100000000 = 3,500,000,000 uPa
35 millibars = 3,500,000,000 micropascals.
Conversion table
| Millibar (mbar) | Micropascal (uPa) |
|---|---|
| 1 mbar | 100,000,000 uPa |
| 5 mbar | 500,000,000 uPa |
| 10 mbar | 1,000,000,000 uPa |
| 25 mbar | 2,500,000,000 uPa |
| 50 mbar | 5,000,000,000 uPa |
| 100 mbar | 10,000,000,000 uPa |
Reverse conversion: Micropascal to Millibar
1 uPa × 1e-8 = 1e-8 mbar
1 micropascal = 1e-8 millibars.
millibars = micropascals × 1e-8
For a page dedicated to this direction, see Micropascal to Millibar.
Understanding the Millibar (mbar)
A millibar is 100 pascals.
Understanding the Micropascal (uPa)
Micropascal is 0.000001 pascal units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many micropascals are in 1 millibar?
1 millibar equals 100,000,000 micropascals, using the exact defined conversion factor rather than an estimate.
How do I convert millibar to micropascal?
Multiply the millibar value by 100000000. The converter above does this instantly to whatever precision you set.
How do I convert micropascal back to millibar?
Use the reverse factor: 1 micropascal equals 1e-8 millibars. You can also use the swap control in the converter above to flip the direction instantly.
What is a millibar?
Millibar (mbar) is a unit of pressure.
What is a micropascal?
Micropascal (uPa) is a unit of pressure.
Is the millibar to micropascal conversion exact?
Yes. Both millibar and micropascal are defined by fixed standards rather than physical artifacts, so the factor of 100000000 used above is exact to as many digits as you choose to display.