Instant psi to bar Conversion
Enter pressure in psi (pounds per square inch), choose decimal precision, and click convert.
What this psi to bar calculator does
This tool converts pressure from psi to bar in one step. It is useful for tire pressure checks, air compressor settings, hydraulic systems, water pressure, and industrial equipment where one manual may show psi while another uses bar.
Since both are pressure units, converting between them is simple math—but using a calculator helps avoid mistakes when you need quick, accurate values.
psi and bar: quick definitions
What is psi?
psi means pounds per square inch. It tells you how much force (in pounds) is applied to an area of one square inch. psi is common in the United States for tires, pumps, HVAC, and compressed air systems.
What is bar?
bar is a metric pressure unit. It is very close to atmospheric pressure at sea level (1 bar is about normal air pressure), which makes it practical in automotive and engineering contexts worldwide.
1 psi = 0.0689475729 bar
1 bar = 14.5037738 psi
psi to bar formula
To convert psi to bar, multiply psi by 0.0689475729.
bar = psi × 0.0689475729
Example: Convert 35 psi to bar.
- 35 × 0.0689475729 = 2.4132 bar
- Rounded to two decimals: 2.41 bar
Common psi to bar conversions
| psi | bar |
|---|---|
| 10 psi | 0.6895 bar |
| 20 psi | 1.3789 bar |
| 30 psi | 2.0684 bar |
| 35 psi | 2.4132 bar |
| 40 psi | 2.7579 bar |
| 50 psi | 3.4474 bar |
| 60 psi | 4.1369 bar |
| 80 psi | 5.5158 bar |
| 100 psi | 6.8948 bar |
| 120 psi | 8.2737 bar |
Where this conversion is used
1) Car and motorcycle tires
Tire sidewalls and owner manuals may list recommended pressure in one unit, while your gauge shows the other. A fast psi-to-bar conversion helps you fill tires correctly for safety, fuel economy, and handling.
2) Bicycle suspension and tire setup
Many pumps and suspension charts alternate between imperial and metric units. Precise conversion is important because small pressure changes can noticeably affect ride feel.
3) Air compressors and pneumatic tools
Compressors, regulators, and air tools often use mixed labeling. Converting properly helps you avoid underpowering tools or exceeding pressure limits.
4) Industrial and lab equipment
In cross-border teams, technical documents may use bar while older equipment displays psi. Consistent unit conversion prevents setup errors and improves communication.
Tips for accurate pressure conversion
- Use enough decimal places for your application (2 is often enough for everyday use, 4+ for technical work).
- Check whether values are gauge pressure (psig) or absolute pressure (psia) in advanced systems.
- Confirm your measuring instrument is calibrated and in good condition.
- Round only at the end of your calculation, not during intermediate steps.
Frequently asked questions
Is bar bigger than psi?
Yes. One bar equals about 14.5 psi, so bar is the larger unit.
How do I convert bar back to psi?
Multiply bar by 14.5037738 to get psi.
Can I use this for tire pressure?
Absolutely. This is one of the most common uses. Just enter the psi value and read the bar output.
Bottom line
If you need a quick and reliable psi to bar conversion, this calculator gives you accurate results instantly. Whether you are checking tires, setting compressor output, or reviewing engineering data, the formula is straightforward: bar = psi × 0.0689475729.