psi to kilopascals
kPa = psi × 6.894757
Factor rounded to the millionth from 6.894757293168.
Convert psi to kPa (and kPa to psi)
psi ↔ kPa converter in both directions: definition of the psi from the pound-force, factor 1 psi ≈ 6.895 kPa, formula, mental math and real examples (North American tire placard, bicycle tire sidewall, air compressor, atmospheric pressure).
Conversion table
| psi | kPa |
|---|---|
| 1 psi | 6.89476 kPa |
| 5 psi | 34.4738 kPa |
| 10 psi | 68.9476 kPa |
| 14.7 psi | 101.353 kPa |
| 20 psi | 137.895 kPa |
| 30 psi | 206.843 kPa |
| 32 psi | 220.632 kPa |
| 35 psi | 241.317 kPa |
| 40 psi | 275.79 kPa |
| 50 psi | 344.738 kPa |
| 100 psi | 689.476 kPa |
| kPa | psi |
|---|---|
| 100 kPa | 14.5038 psi |
| 150 kPa | 21.7557 psi |
| 200 kPa | 29.0075 psi |
| 220 kPa | 31.9083 psi |
| 250 kPa | 36.2594 psi |
| 300 kPa | 43.5113 psi |
| 500 kPa | 72.5189 psi |
| 1,000 kPa | 145.038 psi |
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How does this tool work?
This converter turns a pressure in pounds per square inch (psi) into kilopascals (kPa) and back: type a value in either field and the other updates instantly. It helps you read a vehicle tire placard, which often shows both units, decode a bicycle tire sidewall ("max 100 psi / 690 kPa"), or set up an air compressor and pneumatic tools.
The kilopascal is 1,000 pascals, the pascal being the SI unit of pressure (1 Pa = 1 N/m²). The psi is the pressure of one pound-force (4.4482216152605 N) on one square inch (0.00064516 m²): 1 psi = 6,894.757293168 Pa, or 6.894757 kPa. Conversely, 1 kPa ≈ 0.145038 psi.
To go from psi to kPa, multiply by 6.894757; to go from kPa to psi, multiply by 0.145038 (or divide by 6.894757). The result shows up in the other field on every keystroke.
Mental math: multiply psi by 7 and subtract about 1.5% (35 psi × 7 = 245, exact 241.3 kPa). For kPa to psi, divide by 100 to get bar, then multiply by 14.5: 240 kPa = 2.4 bar ≈ 34.8 psi.
Do not mix up kPa, bar and MPa: 100 kPa = 1 bar and 1,000 kPa = 1 MPa. An error by a factor of 10 or 100 is easy to make when reading a datasheet. Like bar, tire pressure is a gauge pressure (above the atmosphere), whereas 101.325 kPa is the standard absolute atmospheric pressure at sea level.
How to use this tool
Enter the value you read
In the PSI field for a US gauge or placard, or in the kPa field for a metric value.
Read the equivalent
The second field shows the converted pressure; the swap button reverses the two units.
Check against the table
The table under the converter lists the most common tire and compressor pressures, in both directions.
psi ↔ kPa conversion formulas
The psi is tied to the pascal through the pound-force and the square inch.
Kilopascals to psi
psi = kPa ÷ 6.894757 ≈ kPa × 0.145038
The 0.145038 factor is the rounded inverse.
Origin of the factor
1 psi = 4.4482216 N ÷ 0.00064516 m² ≈ 6,894.757 Pa
1 lbf = 0.45359237 kg × 9.80665 m/s² and 1 in = 2.54 cm exactly.
- psi
- pressure in pounds-force per square inch
- kPa
- pressure in kilopascals (1 kPa = 1,000 Pa = 0.01 bar)
Example: 32 psi = 32 × 6.894757 ≈ 220.6 kPa.
Use cases
Car tires
Make sense of a North American placard or manual, or apply a pressure given in kPa with a psi gauge.
Cycling
Respect the minimum and maximum pressures printed on a tire sidewall, often in both psi and kPa.
Compressors and compressed air
Set a regulator or check the working pressure of a tool whose manual is in psi.
Science and weather
Convert a lab or atmospheric pressure from kPa to psi, and back.
Examples
Door-jamb tire placard
35 × 6.894757 ≈ 241.32 kPa, which is why North American placards read "240 kPa, 35 psi".
Input
35 psiResult
241.3 kPaMetric value in a manual
250 × 0.145038 ≈ 36.26 psi, so about 36 psi on a psi gauge.
Input
250 kPaResult
36.26 psiBicycle tire sidewall
100 × 6.894757 = 689.48 kPa, rounded to 690 kPa on the tire.
Input
100 psiResult
689.5 kPaPneumatic tools
90 × 6.894757 ≈ 620.53 kPa, the typical working pressure of an impact wrench or nail gun.
Input
90 psiResult
620.5 kPaAtmospheric pressure
14.7 × 6.894757 ≈ 101.35 kPa; the exact standard value is 101.325 kPa, or 14.696 psi.
Input
14.7 psiResult
101.35 kPaTips and best practices
- Anchor points: 1 psi ≈ 6.9 kPa, 10 psi ≈ 69 kPa, 30 psi ≈ 207 kPa, 100 psi ≈ 689 kPa.
- To go from kPa to bar, simply divide by 100: 220 kPa = 2.2 bar.
- A tire gauge reads gauge pressure: add 101.3 kPa (14.7 psi) to get absolute pressure.
- On bicycle tires, never exceed the maximum value shown, whatever the unit.
- If your value is in bar, use the bar ↔ psi converter instead.
Sources and references
- NIST, Guide for the Use of the International System of Units (SP 811), Appendix B.8: Factors for Units Listed Alphabetically (opens in a new tab)Page in English
- BIPM, The International System of Units (SI Brochure) (opens in a new tab), Bureau international des poids et mesuresPage in English
Frequently asked questions
How many kPa are in a psi?
One psi is 6.894757 kPa (6,894.757 Pa). The value follows from the pound-force and the inch defined by the 1959 international agreement.
What is 35 psi in kPa?
35 psi is about 241.3 kPa (35 × 6.894757). Tire placards usually round it to 240 kPa.
How do you convert kPa to psi?
Multiply kPa by 0.145038. For example, 220 kPa ≈ 31.9 psi and 300 kPa ≈ 43.5 psi.
What is the difference between kPa and bar?
Exactly a factor of 100: 1 bar = 100 kPa. A pressure of 2.4 bar is therefore 240 kPa, or about 34.8 psi.
Why does the placard say 240 kPa and 35 psi?
Because 35 psi = 241.3 kPa, rounded to 240 kPa. Both values describe the same pressure to within 1%.
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