Hectopascal (hPa)
Exactly 100 pascals (equal to one millibar).
What is a hectopascal?
- Symbol
- hPa
- Quantity
- Pressure
- Unit system
- SI
- Definition
- Exactly 100 pascals (equal to one millibar).
- Exact
- Yes, the value is exact by definition
- Source
- SI Brochure, 9th edition (BIPM, 2019)
Common applications
Used in meteorology for air pressure on weather maps. One hectopascal equals one millibar.
Hectopascal in other pressure units
- 1 hPa = 100 PaPascal
- 1 hPa = 0.1 kPaKilopascal
- 1 hPa = 0.0001 MPaMegapascal
- 1 hPa = 1e-7 GPaGigapascal
- 1 hPa = 1 mbarMillibar
- 1 hPa = 0.001 barBar
- 1 hPa ≈ 0.0009869232667 atmStandard atmosphere
- 1 hPa ≈ 0.001019716213 atTechnical atmosphere
- 1 hPa ≈ 0.7500616827 TorrTorr
- 1 hPa ≈ 0.7500615758 mmHgMillimeter of mercury
- 1 hPa ≈ 0.01450377377 psiPound-force per square inch
- 1 hPa ≈ 0.00001450377377 ksiKilopound-force per square inch
Hectopascal quick reference
| Hectopascal | Bar | Pound-force per square inch | Pascal |
|---|---|---|---|
| 1 hPa | = 0.001 bar | ≈ 0.01450377377 psi | = 100 Pa |
| 10 hPa | = 0.01 bar | ≈ 0.1450377377 psi | = 1000 Pa |
| 100 hPa | = 0.1 bar | ≈ 1.450377377 psi | = 10000 Pa |
| 1000 hPa | = 1 bar | ≈ 14.50377377 psi | = 100000 Pa |
Where the hectopascal fits
The next smaller pressure unit is the pascal (Pa). 1 hPa = 100 Pa, and 1 Pa = 0.01 hPa.
The next larger pressure unit is the torr (Torr). 1 hPa ≈ 0.7500616827 Torr, and 1 Torr ≈ 1.333223684 hPa.
Frequently asked questions
- How many bars are in one hectopascal?
- One hectopascal = 0.001 bar (bars).
- How many psi are in one hectopascal?
- One hectopascal ≈ 0.01450377377 psi (psi).
- How many pascals are in one hectopascal?
- One hectopascal = 100 Pa (pascals).