Pressure Converter (PSI to Bar, kPa & atm)
Convert psi to bar for tires and compressors, kPa for European and Asian specs, mmHg for blood pressure and inHg for aviation. Fourteen pressure units, real-world benchmarks and exact step-by-step formulas.
Real-World Benchmarks
Multi-Unit Conversion Matrix
| Group | Measurement | Symbol | Equivalent Value |
|---|---|---|---|
| SI & Metric | Pascal | Pa | 220,632.2334 |
| SI & Metric | Hectopascal | hPa | 2,206.3223 |
| SI & Metric | Kilopascal | kPa | 220.6322 |
| SI & Metric | Megapascal | MPa | 0.2206 |
| SI & Metric | Bar | bar | 2.2063 |
| SI & Metric | Millibar | mbar | 2,206.3223 |
| SI & Metric | Kilogram-force per cm² | kgf/cm² | 2.2498 |
| Imperial & US Customary | Pound per Square Inch | psi | 32 |
| Imperial & US Customary | Kilopound per Square Inch | ksi | 0.032 |
| Atmospheric & Manometric | Standard Atmosphere | atm | 2.1775 |
| Atmospheric & Manometric | Torr | Torr | 1,654.8778 |
| Atmospheric & Manometric | Millimeter of Mercury | mmHg | 1,654.8776 |
| Atmospheric & Manometric | Inch of Mercury | inHg | 65.1527 |
| Atmospheric & Manometric | Inch of Water | inH₂O | 885.757 |
Step-by-Step Mathematical Explanation
- Step 1: Convert 32 psi to the base unit (Pa): 32 × 6,894.75729317 = 220,632.233381 Pa.
- Step 2: Convert base pascals to bars: 220,632.233381 ÷ 100,000 = 2.206322 bar.
- Direct factor: 1 psi = 0.06894757 bar.
Essential Conversion Factors
Pound per Square Inch: US tire, air compressor and hydraulic pressure
Quick Answer & Key Pressure Formulas
Direct Answer: To convert psi to bar, multiply by 0.0689476: bar = psi × 0.0689476. To convert bar to psi, multiply by 14.5038: psi = bar × 14.5038. For kilopascals, kPa = psi × 6.89476. One standard atmosphere is 1.01325 bar, 14.696 psi or 101.325 kPa.
Understanding Pressure Units & Conversion Math
Pressure is force spread over an area. The SI pascal is one newton per square meter — tiny, which is why engineers use kPa, MPa and bar (100,000 Pa). The imperial psi is one pound-force per square inch, exactly 6,894.757 Pa.
1. PSI to Bar (psi → bar)
Multiply psi by its pascal value and divide by 100,000 Pa per bar — or use the combined factor directly:
Example: 32 psi × 0.0689476 = 2.206 bar.
2. Bar to PSI (bar → psi)
Reverse the conversion by multiplying by the reciprocal factor, 14.5038:
Example: 2.5 bar × 14.5038 = 36.26 psi.
Quick Tire-Pressure Math
For a fast estimate at the pump, multiply bar by 14.5 to get psi, and multiply psi by 7 for a rough kPa value:
2.2 bar × 14.5 ≈ 32 psi; 35 psi × 7 ≈ 245 kPa (exact value: 241.3 kPa).
Common Pressure Benchmarks
| Situation | psi | bar | kPa | Significance |
|---|---|---|---|---|
| Sea-Level Atmosphere | 14.70 | 1.013 | 101.3 | Standard atmosphere (1 atm) |
| Car Tire | 32 | 2.21 | 220.6 | Typical cold inflation pressure |
| Road Bike Tire | 100 | 6.89 | 689.5 | High-pressure clincher |
| Espresso Extraction | 130.5 | 9 | 900 | Classic 9-bar pump pressure |
| Pressure Washer | 2,000 | 137.9 | 13,790 | Consumer electric model |
| Scuba Tank (full) | 3,000 | 206.8 | 20,684 | Aluminum 80 cylinder |
| Excavator Hydraulics | 5,000 | 344.7 | 34,474 | Heavy equipment system pressure |
PSI to Bar Chart
| psi | bar |
|---|---|
| 1 | 0.069 |
| 5 | 0.345 |
| 10 | 0.689 |
| 14.5 | 1 |
| 20 | 1.379 |
| 25 | 1.724 |
| 28 | 1.931 |
| 30 | 2.068 |
| 32 | 2.206 |
| 33 | 2.275 |
| 35 | 2.413 |
| 36 | 2.482 |
| 40 | 2.758 |
| 45 | 3.103 |
| 50 | 3.447 |
| 60 | 4.137 |
| 80 | 5.516 |
| 100 | 6.895 |
| 150 | 10.342 |
| 3,000 | 206.843 |
Bar to PSI Chart
| bar | psi |
|---|---|
| 0.5 | 7.25 |
| 1 | 14.5 |
| 1.5 | 21.76 |
| 2 | 29.01 |
| 2.2 | 31.91 |
| 2.3 | 33.36 |
| 2.4 | 34.81 |
| 2.5 | 36.26 |
| 2.8 | 40.61 |
| 3 | 43.51 |
| 3.5 | 50.76 |
| 4 | 58.02 |
| 5 | 72.52 |
| 6 | 87.02 |
| 8 | 116.03 |
| 10 | 145.04 |
| 20 | 290.08 |
| 200 | 2,900.75 |
Bar to kPa Chart
| bar | kPa |
|---|---|
| 0.5 | 50 |
| 1 | 100 |
| 1.5 | 150 |
| 2 | 200 |
| 2.2 | 220 |
| 2.5 | 250 |
| 3 | 300 |
| 4 | 400 |
| 5 | 500 |
| 6 | 600 |
| 8 | 800 |
| 10 | 1,000 |
Frequently Asked Questions
How many psi are in 1 bar?
One bar equals 14.5038 psi. Conversely, 1 psi equals 0.0689476 bar.
What is the difference between psi, psig and psia?
psia is absolute pressure measured from a perfect vacuum. psig is gauge pressure measured relative to the surrounding air, so psia = psig + 14.7 at sea level. Tire and compressor gauges show psig.
Is bar the same as atmosphere?
Not exactly: 1 atm = 1.01325 bar. The 1.3% difference rarely matters for tires but does matter in lab and vacuum work.
What does a tire pressure of 220 kPa mean in psi?
220 kPa × 0.145038 = 31.9 psi, or about 2.2 bar — a typical passenger car tire pressure.