PSI to Kilopascals Converter (psi to kPa)

Air compressors, pneumatic tools, pressure canners and water pressure regulators sold in the US are rated in psi, but engineering drawings, Canadian and Australian manuals and many digital gauges set to SI show kilopascals. The psi is one pound-force on one square inch, and since both the pound and the inch are defined exactly, it comes to 6.894757 kPa to seven significant figures.

Results in kilopascals grow large quickly: a 90 psi air-tool supply is more than 600 kPa, which is why hydraulic and industrial ratings often move up to megapascals (1 MPa = 1,000 kPa). For readings near the atmosphere, remember that both kinds of gauge usually show pressure above the surrounding air, not absolute pressure.

How to use this tool

1. Type a value in the Pound per Square Inch box to see it in kilopascals, or type in the Kilopascal box to convert the other way.
2. Press ⇄ to swap the two units, or Load example for a typical value.
3. Check the charts below for common values; for other units, open the Pressure converter.

Formula

Kilopascal (kPa) = Pound per Square Inch (psi) × 6.89475729317

Pound per Square Inch (psi) = Kilopascal (kPa) × 0.14503773773

Both factors come from exact definitions: 1 kilopascal = 0.14503773773 pounds per square inch and 1 pound per square inch = 6.89475729317 kilopascals (shown to 12 significant digits).

Example

Two conversions worked with the same factors the converter uses:

90 psi × 6.89475729317 ≈ 620.528 kPa

400 kPa × 0.14503773773 ≈ 58.0151 psi

Pound per Square Inch to Kilopascal chart

Common values from pounds per square inch to kilopascals, rounded to four decimal places.

Kilopascal to Pound per Square Inch chart

The reverse direction for values people often look up.

Ratings given in psi

Quick mental estimate

Multiply by 7, then take off 1.5%: 35 psi → 245 − 3.7, roughly 241 kPa. Multiplying by 7 alone is about 1.5% high, which is still close enough for a quick check of a tire or compressor reading.

Use the converter or the charts when the exact figure matters.

The two units

Pound per Square Inch (psi): One pound-force per square inch (psi) is about 6,894.76 pascals. A factor conversion is valid when both readings have the same reference; changing absolute pressure to gauge pressure (psig) also requires subtracting the reference pressure.

Kilopascal (kPa): A kilopascal (kPa) is 1,000 pascals. It is used for tire pressures, weather and engineering in metric countries; standard sea-level air pressure is 101.325 kPa.