Convert Pressure from pounds per square inch to kilopascals (psi to kPa)

Pound per Square Inch to Kilopascal Conversion Formula

To convert a pressure from pounds per square inch (psi) to kilopascals (kPa), multiply by 6.89476.

• kPa = psi × 6.89476

The factor is the pascal definition of the psi divided by a thousand: one pound-force spread over one square inch works out to 6,894.76 N/m², so 6.89476 kPa. For mental arithmetic, multiplying by 7 lands within 1.5% — close enough to sanity-check any gauge reading before trusting the exact figure.

Two anchors cover most of what a gauge will ever show:

• 14.50 psi ≈ 100 kPa — one bar.
• 14.696 psi = 101.325 kPa — the standard atmosphere.

Step-by-Step Example

A US tire gauge reads 32 psi and the vehicle's door placard — printed for the Canadian market — specifies cold inflation in kPa:

1. Take the pressure: 32 psi
2. Multiply by 6.89476: 32 × 6.89476 = 220.6 kPa

The placard almost certainly says 220 kPa. Same tire, same air, two labels.

Quick Reference Table

Gauge or Absolute — the One Word That Changes the Answer

Nearly every psi figure encountered outside a laboratory is psig: pressure measured relative to the surrounding atmosphere, which is what a Bourdon-tube gauge physically reports. Kilopascal figures, by contrast, arrive from both conventions — automotive and pneumatic documents use gauge kPa, while meteorology and thermodynamics work in absolute terms. The multiplication by 6.89476 is identical either way; what changes is whether 101.325 kPa needs to be added afterwards. A 32 psig tire is at 220.6 kPa gauge but roughly 322 kPa absolute, and gas-law calculations fed the first number when they need the second are wrong by nearly half. When a converted value feeds anything beyond another gauge — a solubility table, a boiling-point chart, a compressor sizing formula — carry the g or the a along with the digits.

How many pounds per square inch are in one kilopascal? One kilopascal (kPa) contains 0.14503768078 pounds per square inch (psi) — the inverse of the factor above. Multiplying by 6.8947600004501395751 takes you from pounds per square inch to kilopascals; multiplying by 0.14503768078 brings you back.

Put in words: one pound per square inch equals 6.8947600004501395751 kilopascals, so the pound per square inch is the larger unit of this pair. Converting between them never changes the amount of pressure being measured — only the size of the unit you count it in.

What is a pound per square inch (psi)?

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.

Common Examples of PSI (Where is PSI Used?)

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.

Converting PSI to Metric Units like Pascals and Bar

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.

Understanding the Types of PSI: PSIG, PSIA, and PSID

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.

What is a kilopascal (kPa)?

A kilopascal (kPa) is a metric unit of pressure that equals 1,000 pascals.

It is one of the most common units for measuring pressure worldwide, used in both scientific and everyday applications.

The Kilopascal (kPa) Explained

The base unit, the pascal (Pa), is named after the French polymath Blaise Pascal.

As part of the metric system (also known as the SI system), the kilopascal is widely used in scientific, engineering, and industrial fields due to its standardization and ease of calculation.

Common Applications of Kilopascals (kPa)

The kPa unit is used to measure pressure in many everyday and technical contexts. Common examples include:

• Tire Pressure: A common measurement for vehicle tire pressure in many countries outside the US.
• Weather Forecasting: Used for reporting atmospheric pressure.
• HVAC Systems: Essential for measuring differential pressure in heating, ventilation, and air conditioning systems.
• Medical: Frequently used for measuring blood pressure.
• Manufacturing: Critical for monitoring pressure in various industrial processes.

Kilopascal Conversions (kPa to PSI and Bar)

For practical use, it's essential to understand how kPa converts to other common pressure units.

• kPa to PSI: 1 kPa is approximately 0.145 PSI (Pounds per Square Inch). PSI is the standard pressure unit used in the United States.
• kPa to Bar: 100 kPa is exactly equal to 1 bar. The bar is another metric unit frequently used for atmospheric and water pressure.

pound per square inch to kilopascal Conversion Table

Here are some quick reference conversions from pound per square inch (psi) to kilopascal (kPa):

This conversion in other languages

Engineering datasheets across Europe write pound per square inch to kilopascal several different ways. The calculation is the same in every one of them.