Why Convert PSI to Bars?
Converting between psi (psi) and bars (bar) is one of the most common pressure conversions. Whether for engineering, cooking, travel, or science, knowing how to quickly convert psi to bar saves time and prevents errors.
Pressure conversions between psi and bar are critical in automotive maintenance, meteorology, and diving. Tire pressure recommendations differ by region — European cars typically specify bar while US vehicles use PSI. Weather services report atmospheric pressure in different units: hPa/mbar in most countries, mmHg (inHg) in the US. Scuba divers must understand ATM conversions to calculate safe diving depths and decompression schedules.
How to Convert PSI to Bars
To convert psi to bars, use the following formula:
bar = psi × 0.06894757293
Example: 1 psi = 0.06894757293 bar
For example, 5 psi = 0.3447378647 bar, 10 psi = 0.6894757293 bar, and 100 psi = 6.894757293 bar. Our calculator above performs this conversion instantly with full precision — no rounding errors.
Common Use Cases
- Standard passenger car tire pressure: 33 psi = 2.275269907 bar
- Fully loaded SUV tire pressure: 40 psi = 2.757902917 bar
- Truck tire pressure: 120 psi = 8.273708752 bar
- Mountain bike tire pressure (high end): 80 psi = 5.515805835 bar
- Scuba diving tank pressure: 3000 psi = 206.8427188 bar
Common Mistakes to Avoid
- Gauge vs absolute: Tire pressure gauges read relative to atmospheric pressure (gauge pressure). Add 1 atm (~14.7 psi) to get absolute pressure.
- Bar vs ATM confusion: 1 bar ≈ 0.987 atm — they're close but not equal. For precise work, don't interchange them.
- Unit proliferation: Pressure has many units (Pa, bar, psi, atm, mmHg, torr). Always confirm which unit your equipment uses.
Pro Tips
- Memorize the factor: 1 psi = 0.06894757293 bar. For quick mental math, remember this base conversion.
- Quick reference: 5 psi = 0.3447378647 bar · 10 psi = 0.6894757293 bar · 25 psi = 1.723689323 bar · 50 psi = 3.447378647 bar · 100 psi = 6.894757293 bar
- Bookmark this page: Save this converter for instant access. It works offline once loaded — no internet needed.
PSI to Bars Conversion Table
| psi | bar |
|---|---|
| 0.01 psi | 0.0006894757293 bar |
| 0.1 psi | 0.006894757293 bar |
| 0.5 psi | 0.03447378647 bar |
| 1 psi | 0.06894757293 bar |
| 2 psi | 0.1378951459 bar |
| 5 psi | 0.3447378647 bar |
| 10 psi | 0.6894757293 bar |
| 20 psi | 1.378951459 bar |
| 50 psi | 3.447378647 bar |
| 100 psi | 6.894757293 bar |
| 500 psi | 34.47378647 bar |
| 1000 psi | 68.94757293 bar |
Values are calculated with 10-digit precision based on NIST SP 811 conversion factors.