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To convert from pound per square inch (psi) to hectopascal (hPa), use the following formula:
With is the ratio between the base units kilopascal (kPa) and kilopound per square inch (ksi).
Let's convert 5 pound per square inch (psi) to hectopascal (hPa).
Using the formula:
Therefore, 5 pound per square inch (psi) is equal to hectopascal (hPa).
Here are some quick reference conversions from pound per square inch (psi) to hectopascal (hPa):
| pounds per square inch | hectopascals |
|---|---|
| 0.000001 psi | hPa |
| 0.001 psi | hPa |
| 0.1 psi | hPa |
| 1 psi | hPa |
| 2 psi | hPa |
| 3 psi | hPa |
| 4 psi | hPa |
| 5 psi | hPa |
| 6 psi | hPa |
| 7 psi | hPa |
| 8 psi | hPa |
| 9 psi | hPa |
| 10 psi | hPa |
| 20 psi | hPa |
| 30 psi | hPa |
| 40 psi | hPa |
| 50 psi | hPa |
| 100 psi | hPa |
| 1000 psi | hPa |
| 10000 psi | hPa |
For all Pressure converters, choose units using the From/To dropdowns above.
A pound per square inch (PSI) is a unit of pressure commonly used in the imperial system (which is standard in the United States).
It measures the amount of force applied over a single square inch of area.
PSI is a critical measurement for safety and performance in many common items, including:
Vehicle Tires: Proper tire pressure (PSI) ensures optimal handling, fuel efficiency, and tire life. You can find the recommended level on a sticker inside the driver's door.
Home Water Pressure: Affects everything from shower performance to how well appliances like dishwashers and washing machines function.
Sports Equipment: Items like footballs, basketballs, and soccer balls require a specific PSI to perform correctly and safely.
Tools: Air compressors, pressure washers, and paint sprayers all have specific PSI ratings for safe and effective operation.
While PSI is standard in the imperial system, scientific and international contexts use metric (SI) units like the Pascal (Pa) and the bar.
PSI to Pascal (Pa): The official SI unit for pressure.
1 PSI ≈ 6,894.76 Pascals (or 6.895 kilopascals, kPa).
PSI to Bar: A common unit in automotive and weather contexts. 1 bar is roughly equal to atmospheric pressure at sea level.
1 PSI ≈ 0.0689 bar.
The term "PSI" can be specified further to give more context:
PSIG (Pound-force per square inch gauge): Measures pressure relative to the surrounding atmospheric pressure. This is the most common measurement, used by a standard tire gauge.
PSIA (Pound-force per square inch absolute): Measures pressure relative to a perfect vacuum (absolute zero pressure).
The formula is: PSIA = PSIG + local atmospheric pressure.
PSID (Pound-force per square inch differential): Measures the difference in pressure between two separate points in a system, such as across a filter or valve.
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: