psi to kPa Converter
Convert psi to kilopascals for tire pressure, engineering, and scientific measurement.
How It Works
Formula: psi to kPa = value × 6.89475729
Example: 32 psi = 220.632233 kPa
Note: 1 psi equals 6.8948 kilopascals, the conversion from US pressure to the SI unit.
Common Uses
Quick Conversion Table
| psi | kPa |
|---|---|
| 10 | 68.9476 |
| 30 | 206.8427 |
| 50 | 344.7379 |
| 100 | 689.4757 |
| 200 | 1379 |
Rounding Rule
Rounded to 2 decimal places
Error Margin
±0.01 kPa
Precision Guidance
For tires, round to whole kPa. For engineering, keep 2 decimals.
Common Mistakes
1 psi is 6.895 kPa, not 6.895 bar. Keep psi, bar, and kPa straight when reading tire labels.
Frequently Asked Questions
What is 32 psi in kPa?
32 psi equals 220.63 kPa using the conversion 1 psi = 6.89476 kPa.
How do I convert psi to kPa?
Multiply the psi value by 6.8948. For example, 35 psi × 6.8948 = 241.32 kPa.
What is normal tire pressure in kPa?
A typical US tire pressure of 32-35 psi equals about 220-241 kPa.
Is kPa the SI pressure unit?
Yes, the pascal is the SI unit; kPa (1000 pascals) is common in engineering and science.
Deep Dive Guide
Psi to kPa Conversion Guide for US Tire Pressure and Engineering
Convert psi to kPa accurately for US tire pressure, engineering specs, and imported vehicle service. Learn the 6.89476 factor and practical examples.
Read Full Guide →More Converters You May Like
Exact Constants & Authoritative Sources
Every conversion on this page uses the fixed, internationally agreed constants below — drawn from NIST and the SI Brochure. No values are estimated or rounded as if exact. See the full list on our Sources & Standards page.
- EXACT1 standard atmosphere (atm) = 101,325 pascals (exact)
- EXACT1 bar = 100,000 pascals (exact, definition)
- EXACT1 psi = 6894.757293168 pascals (exact, 1 lbf/in²)
- EXACT1 kilopascal (kPa) = 1000 pascals (definition)
Common Pitfalls & How to Avoid Them
psi vs. bar vs. kPa
1 bar ≈ 14.5038 psi; 1 atm = 14.6959 psi = 101.325 kPa. Tire pressures are usually psi (US) or bar (EU) — a 2.3 bar tire is ~33 psi, not 23.
Gauge vs. absolute
Tire and tire-inflation tools read gauge pressure (psig), relative to atmosphere. Adding 1 atm gives absolute (psia). Use the right one in engineering calculations.
A unit-conversion reference site has no manufacturer-specific or device calibration parameters, so "layered tuning" does not apply here. The only real error-handling is input validation: the converter rejects non-numeric, empty, or out-of-range entries and shows a clear message, then falls back to exact constants above. No estimated or rounded figures are ever presented as exact.
Authoritative sources for this page
- NIST (U.S. National Institute of Standards and Technology) — NIST SP 330 — The International System of Units (SI), 2019 edition
- BIPM (International Bureau of Weights and Measures) — SI Brochure — The International System of Units (9th edition)
Last Updated 2026 | This converter was reviewed for accuracy