Pressure conversion inputs
Batch conversion table
Create up to 500 rows using a start, end, and step value.
| PSI | Bar | kPa | MPa |
|---|
Calculation history
| Time | Input | Result | Direction |
|---|
Formula used
One pound per square inch equals 0.0689475729 bar.
bar = PSI × 0.0689475729
One bar equals approximately 14.5037737730 pounds per square inch.
PSI = bar × 14.5037737730
These factors derive from exact pascal definitions for both units.
How to use this calculator
- Select PSI to bar or bar to PSI.
- Enter one pressure value using decimals or scientific notation.
- Choose the required decimal precision.
- Enable scientific notation when handling very large or small values.
- Select Calculate to view the rounded value, exact value, steps, and equivalents.
- Use Copy, CSV, or PDF controls to save the result.
- Generate a batch table for repeated pressure conversions.
Example PSI to bar values
| PSI | Bar | Typical reference |
|---|---|---|
| 1 | 0.0689476 | Small pressure difference |
| 5 | 0.344738 | Low pneumatic pressure |
| 14.6959 | 1.01325 | Standard atmosphere near sea level |
| 30 | 2.06843 | Common tire pressure range |
| 50 | 3.44738 | Higher tire or equipment pressure |
| 100 | 6.89476 | Compressed air systems |
| 150 | 10.3421 | Industrial pneumatic systems |
| 300 | 20.6843 | High-pressure equipment |
| 1000 | 68.9476 | Hydraulic system range |
Understanding PSI and bar conversions
PSI measures pressure through pounds acting on one square inch. It remains common in vehicles, compressors, hydraulics, and American specifications. Accurate conversion prevents mismatched settings across international pressure equipment.
Bar is a metric pressure unit used throughout many industries. One bar equals exactly one hundred thousand pascals by definition. This simple base makes comparisons easier across metric systems.
The conversion factor links both units through their pascal values. Multiply PSI by 0.0689475729 to obtain pressure in bar. Reverse calculations use 14.5037737730 as their required pressure multiplier.
Rounding affects displayed values but not the underlying calculation. More decimals help technical work involving narrow pressure tolerances. Fewer decimals produce cleaner estimates for everyday practical decisions.
Scientific notation helps when values become extremely large or small. The calculator preserves the same conversion factor during that display. Only the presentation changes, while numerical meaning remains consistent.
Negative pressure values can describe gauge pressure below atmospheric conditions. They should not be confused with impossible negative absolute pressure. Always confirm whether equipment reports gauge or absolute measurements.
Batch conversion creates a table from chosen range values. It supports repeated checks for charts, documentation, and equipment schedules. A sensible increment keeps the table readable and useful.
Additional units provide context beyond the selected primary conversion. Kilopascals and megapascals are especially useful for engineering documents. Atmospheres and torr support scientific and laboratory pressure comparisons.
CSV files store results in a simple spreadsheet-ready format. PDF output uses the browser printing system for broad compatibility. Both options help preserve calculations for reviews and records.
Always verify instrument calibration before applying any converted setting. Unit conversion cannot correct inaccurate sensors or misunderstood pressure references. Careful labels prevent PSI and bar values becoming interchanged.
Frequently asked questions
How many bar are in one PSI?
One PSI equals approximately 0.0689475729 bar.
How do I convert PSI to bar?
Multiply the PSI value by 0.0689475729.
How do I convert bar to PSI?
Multiply the bar value by 14.5037737730.
Is 1 bar the same as 15 PSI?
No. One bar equals about 14.5038 PSI, although 15 PSI is a rough estimate.
Can this calculator handle negative values?
Yes. Negative values may represent gauge pressure below the local atmospheric pressure.
Does changing precision alter the calculation?
No. Precision changes the displayed rounding only. The internal conversion uses full numeric precision.
Can I enter scientific notation?
Yes. Inputs such as 1.5e3 and 2e-4 are accepted.
What is the difference between gauge and absolute pressure?
Gauge pressure references local atmospheric pressure. Absolute pressure references a perfect vacuum.
Why are kPa and MPa also shown?
These metric units provide useful engineering comparisons and simplify pressure documentation.
How does the batch converter work?
It converts every value between the selected start and end using the chosen increment.
How can I save a conversion?
Download a CSV file, use browser printing for PDF, or copy the result text.