Convert Hectopascals to Millipascals
Convert Hectopascals (hPa) to Millipascals (mPa) instantly and accurately.
Conversion Formula
mPa = hPa × 100000
About Hectopascals
A hectopascal (hPa) = 100 Pa = 1 mbar - the WMO-official SI-compatible meteorological pressure unit since 1986, replacing millibar with no numerical change. All modern surface observations (METAR, SYNOP), digital barometers, aviation weather, and weather apps report in hPa. QNH altimeter settings outside North America are in hPa. ICAO standard sea-level pressure is 1013.25 hPa. Continental high-pressure record exceeds 1084 hPa; Typhoon Tip (1979) holds the low record at ~870 hPa. 1 hPa = 100 Pa.
About Millipascals
A millipascal (mPa) is 10⁻³ Pa. It appears primarily in rheology as the millipascal-second (mPa·s = centipoise) for dynamic viscosity: water at 20°C is 1.002 mPa·s; olive oil ~80 mPa·s; honey 2,000-10,000 mPa·s. Food technology, polymer processing, pharmaceutical formulation, and inkjet printing all specify flow behaviour in mPa·s. Partial pressures of trace atmospheric gases and ultra-high-vacuum leak rates measured by residual gas analysers are also expressed in millipascals. 1 mPa = 10⁻³ Pa.
Quick Reference Table
| Hectopascals (hPa) | Millipascals (mPa) |
|---|---|
| 1 hPa | 100000 mPa |
| 2 hPa | 200000 mPa |
| 5 hPa | 500000 mPa |
| 10 hPa | 1000000 mPa |
| 25 hPa | 2500000 mPa |
| 50 hPa | 5000000 mPa |
| 100 hPa | 10000000 mPa |