psi to bar converter

How to convert pounds per square inch to bar

A pound per square inch is a pound-force on a square inch. With the international pound, the standard gravity 9.80665 m/s², and the inch of 25.4 mm, one psi is 6894.757293168361 pascals. A bar is exactly 100,000 pascals. Dividing those two constants is the factor this page uses: psi × 6894.757293168361 / 100000, which is 0.0689475729317 bar per psi. Ten psi is 0.6895 bar. Thirty-two psi, a common car tyre, is 2.206 bar. The unit converter's pressure category stores the same pascal factors, so the two pages match.

Tyre pressures, compressor gauges, and hydraulic notes that cross from a US psi gauge to a European bar gauge. 14.5 psi is about 1.000 bar (the exact 1 bar is 14.5038 psi). Atmospheric pressure is about 14.696 psi or 1.01325 bar, which is 1 atm in the same table. This page converts the number. It does not know if your gauge reads absolute or gauge pressure.

Exact formula

Formulabar = psi × (6894.757293168361 ÷ 100000)

bar = psi × (6894.757293168361 ÷ 100000) One psi is 0.0689475729317 bar. Ten psi is 0.689475729317 bar. The worked example below uses that same conversion.

Conversion table

The pounds per square inch column runs from 1 psi (0.0689 bar) through 1000 psi (68.948 bar).

Worked example: Pounds per square inch to Bar

A passenger-car tyre at 32 psi is 2.206 bar. The factor is 6894.757293168361 pascals per psi divided by 100,000 pascals per bar. One bar is about 14.5038 psi, so 14.5 psi is 0.9997 bar, a rounded reciprocal people treat as exact. A single psi is 0.0689 bar. psig is gauge pressure, above the local atmosphere. psia includes it. This page does not add or remove 1 bar for you. Pounds per square inch are force on an area, not the mass pounds on the kilograms page.

Pitfalls for pounds per square inch to bar

• psig is gauge pressure, above the local atmosphere. psia includes the atmosphere. Subtracting or adding 1 bar is a decision this page will not make for you.
• 14.5 psi per bar is a rounded reciprocal. The stored factor is 6894.757293168361 Pa per psi and 100000 Pa per bar.
• Bar and barg have the same absolute-versus-gauge trap as psi and psig.
• Pounds per square inch are not pounds of mass. Do not run this through the kilograms page.