Convert Hectopascals to Torr
Convert Hectopascals (hPa) to Torr (Torr) instantly and accurately.
Conversion Formula
Torr = hPa × 0.7500616827
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 Torr
The torr is defined as exactly 1/760 of a standard atmosphere ≈ 133.322 Pa - effectively replacing mmHg with an exact definition. Named after Evangelista Torricelli (1608-1647), inventor of the barometer. Vacuum science universally uses torr: rough vacuum 760-1 torr; medium vacuum 1-10⁻³ torr; high vacuum 10⁻³-10⁻⁷ torr; ultra-high vacuum below 10⁻⁹ torr. UHV systems for surface science, particle accelerator beam tubes, and space simulation chambers reach 10⁻¹¹-10⁻¹² torr. 1 torr = 133.322 Pa.
Quick Reference Table
| Hectopascals (hPa) | Torr (Torr) |
|---|---|
| 1 hPa | 0.750062 Torr |
| 2 hPa | 1.50012 Torr |
| 5 hPa | 3.75031 Torr |
| 10 hPa | 7.50062 Torr |
| 25 hPa | 18.7515 Torr |
| 50 hPa | 37.5031 Torr |
| 100 hPa | 75.0062 Torr |