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To convert from hectopascal (hPa) to pascal (Pa), use the following formula:
To convert from hectopascal (hPa) to kilopascal (kPa), use the following formula:
To convert from hectopascal (hPa) to megapascal (MPa), use the following formula:
To convert from hectopascal (hPa) to millibar (mbar), use the following formula:
To convert from hectopascal (hPa) to bar (bar), use the following formula:
To convert from hectopascal (hPa) to torr (torr), use the following formula:
To convert from hectopascal (hPa) to meter of water @ 4°C (mH2O), use the following formula:
To convert from hectopascal (hPa) to millimeter of mercury (mmHg), use the following formula:
To convert from hectopascal (hPa) to pound per square inch (psi), use the following formula:
With is the ratio between the base units kilopound per square inch (ksi) and kilopascal (kPa).
To convert from hectopascal (hPa) to kilopound per square inch (ksi), use the following formula:
With is the ratio between the base units kilopound per square inch (ksi) and kilopascal (kPa).
To convert from hectopascal (hPa) to Inch of mercury (inHg), use the following formula:
With is the ratio between the base units kilopound per square inch (ksi) and kilopascal (kPa).
A hectopascal (hPa) is a metric unit used to measure pressure.
You will most commonly see it in weather reports to describe atmospheric pressure (also known as barometric pressure).
If you've seen millibars (mbar) on older weather maps, the hectopascal is its modern replacement.
The switch was simple for meteorologists because the units are exactly the same (1 hPa = 1 mbar).
The hectopascal is now the international standard for measuring atmospheric pressure, making weather data consistent worldwide.
The conversion is in the name. The prefix "hecto-" means 100. This makes the math simple:
Just as "hecto-" means 100, "kilo-" means 1,000. This defines their relationship: