Hectopascal is 100 pascal units.
Hectopascals to Millibars Converter — hPa to mbar
Convert Hectopascal (hPa) to Millibar (mbar) using the exact conversion factor (1 hectopascal = 1 millibar). See the formula, worked examples, and conversion table.
Hectopascals to Millibars 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.
A millibar is 100 pascals.
Result = input x 100 / 100.
Pressure uses the pascal as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Hectopascals to Millibars
Hectopascal and Millibar 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: Hectopascal is 100 pascal units, and a millibar is 100 pascals.
Formula
millibars = hectopascals × 1
This factor comes from each unit's defined relationship to the category's base unit: 1 hectopascal equals 100 base units, and 1 millibar equals 100 base units, so dividing one by the other gives the direct hectopascal-to-millibar factor of 1.
Simple example
1 hPa × 1 = 1 mbar
1 hectopascal = 1 millibar.
Real-world example
35 hPa × 1 = 35 mbar
35 hectopascals = 35 millibars.
Conversion table
| Hectopascal (hPa) | Millibar (mbar) |
|---|---|
| 1 hPa | 1 mbar |
| 5 hPa | 5 mbar |
| 10 hPa | 10 mbar |
| 25 hPa | 25 mbar |
| 50 hPa | 50 mbar |
| 100 hPa | 100 mbar |
Reverse conversion: Millibar to Hectopascal
1 mbar × 1 = 1 hPa
1 millibar = 1 hectopascal.
hectopascals = millibars × 1
For a page dedicated to this direction, see Millibar to Hectopascal.
Understanding the Hectopascal (hPa)
Hectopascal is 100 pascal units.
Understanding the Millibar (mbar)
A millibar is 100 pascals.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many millibars are in 1 hectopascal?
1 hectopascal equals 1 millibar, using the exact defined conversion factor rather than an estimate.
How do I convert hectopascal to millibar?
Multiply the hectopascal value by 1. The converter above does this instantly to whatever precision you set.
How do I convert millibar back to hectopascal?
Use the reverse factor: 1 millibar equals 1 hectopascal. You can also use the swap control in the converter above to flip the direction instantly.
What is a hectopascal?
Hectopascal (hPa) is a unit of pressure.
What is a millibar?
Millibar (mbar) is a unit of pressure.
Is the hectopascal to millibar conversion exact?
Yes. Both hectopascal and millibar are defined by fixed standards rather than physical artifacts, so the factor of 1 used above is exact to as many digits as you choose to display.