Convert pressure from bar to pounds per square inch (PSI) or PSI to bar, with results in kPa and MPa using the standard 1 bar = 14.5038 PSI factor.

Enter one pressure and choose its SI / bar-family unit.

Converts pressure, not pounds of mass or force alone. Signed values are allowed; gauge or absolute reference stays unchanged.

1 bar = 100,000 Pa.

Common Mistakes Quick tips
  • Choose a conversion direction, then enter one pressure value and select its input unit.
  • Mixing psi with psf. 1 psi = 144 psf; choose the correct pounds-based unit for your area basis.
  • Confusing gauge vs absolute pressure. This tool converts unit systems assuming the same reference (both gauge or both absolute).
  • Rounding too early. Engineering calculations may need more precision than 3 decimals, especially when converting MPa ↔ ksi.
When to Use This Calculator
  • Converting compressor, hydraulics, or tire pressures from bar/kPa/MPa to psi.
  • Standardizing building/HVAC specs reported in psf with data given in kPa or bar.
  • Structural or materials work converting MPa to ksi and back.
Input Definitions
  • Bar-side units — bar (100,000 Pa), mbar (100 Pa), kPa (1,000 Pa), MPa (1,000,000 Pa), Pa (1 Pa).
  • Pounds-based units — psi (lb/in², 6,894.757293168 Pa), psf (lb/ft², 47.88025898033584 Pa), ksi (kips/in², 6,894,757.293168 Pa).
  • Conversions — psi = bar × 14.5037738; psf = bar × 2,088.543424; ksi = bar × 0.0145037738.

Related Calculators

Bar to lbs Formula

The following formulas convert bar to pounds-based pressure units (psi) and back; psf and ksi factors are provided below.

psi = 14.5037738 bar bar = (psi) / (14.5037738)
  • Bar-family units: 1 bar = 100,000 Pa; 1 mbar = 100 Pa; 1 kPa = 1,000 Pa; 1 MPa = 1,000,000 Pa.
  • Pounds-based units: 1 psi = 6,894.757293168 Pa; 1 psf = 47.88025898033584 Pa; 1 ksi = 6,894,757.293168 Pa.
Bar to PSI Conversion Table (1 bar ≈ 14.5038 psi)
Bar PSI (lb/in²)
0.11.450
0.22.901
0.34.351
0.57.252
0.710.153
114.504
1.521.756
229.008
2.536.259
343.511
458.015
572.519
687.023
7101.526
8116.030
10145.038
12174.045
15217.557
20290.075
25362.594
SI relations: 1 bar = 100,000 Pa; 1 psi = 6,894.757 Pa. Therefore, 1 bar ≈ 14.5038 psi.

How do you convert bar to pounds-based units? Multiply bar by 14.5037738 to get psi, by 2,088.543424 to get psf, or by 0.0145037738 to get ksi.

How do you convert pounds-based units to bar? Multiply psi by 0.0689475729, psf by 0.0004788026, or ksi by 68.9475729 to get bar.

Bar to PSI Conversion Table

Bar to PSI (lb/in²)
Bar PSI (lb/in²)
0.101.450
0.202.901
0.253.626
0.304.351
0.507.252
0.7510.878
114.504
1.521.756
229.008
2.536.259
343.511
458.015
572.519
7101.526
10145.038
12174.045
15217.557
20290.075
* Rounded: 1 bar ≈ 14.5037738 psi (using 1 psi ≈ 6,894.757293168 Pa). Values rounded to 3 decimals.

Example Problem

Convert 2.5 bar to psi.

Use the formula: psi = bar × 14.5037738.

psi = 2.5 × 14.5037738 = 36.259 psi