psi to bar Converter
Convert psi to bar for tire pressure, HVAC, and industrial pressure measurement.
How It Works
Formula: psi to bar = value × 0.0689475729
Example: 32 psi = 2.206322 bar
Note: 1 psi equals 0.06895 bar, the conversion for US tire and industrial pressure readings.
Common Uses
Quick Conversion Table
| psi | bar |
|---|---|
| 10 | 0.6895 |
| 30 | 2.0684 |
| 50 | 3.4474 |
| 100 | 6.8948 |
| 200 | 13.7895 |
Rounding Rule
Rounded to 4 decimal places
Error Margin
±0.0001 bar
Precision Guidance
For tires, round to 2 decimals. For industrial use, keep 3-4 decimals.
Common Mistakes
psi and bar are not interchangeable. 1 bar is about 14.5 psi, so always convert before inflating foreign-spec tires.
Frequently Asked Questions
What is 32 psi in bar?
32 psi equals 2.2063 bar using the conversion 1 psi = 0.0689476 bar.
How do I convert psi to bar?
Multiply the psi value by 0.06895. For example, 35 psi × 0.06895 = 2.413 bar.
What is normal tire pressure in bar?
A typical US tire pressure of 32-35 psi equals about 2.2-2.4 bar.
Is 1 bar close to 1 atmosphere?
1 bar is 14.504 psi, slightly less than 1 standard atmosphere (14.696 psi).
Deep Dive Guide
Psi to Bar Conversion Guide for US Tire Pressure and HVAC
Convert psi to bar accurately for US tire pressure, HVAC, and imported European vehicle service. Learn the 0.06895 factor and best practices.
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