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Convert pressure units easily between PSI, Bar, Kilopascals (kPa), Atmospheres (atm), and Torr. Free calculator for automotive tires, hydraulics & HVAC.
Everyday tire, tank, and atmospheric pressure values
| Pound per square inch (psi) | Bar (bar) | Bar (Reverse) | Pound per square inch Equivalent | Action |
|---|---|---|---|---|
| 0.1 psi | 0.00689 bar | 0.1 bar | 1.45038 psi | |
| 0.5 psi | 0.03447 bar | 0.5 bar | 7.25189 psi | |
| 1 psi | 0.06895 bar | 1 bar | 14.50377 psi | |
| 2 psi | 0.13790 bar | 2 bar | 29.00754 psi | |
| 5 psi | 0.34474 bar | 5 bar | 72.51885 psi | |
| 10 psi | 0.68948 bar | 10 bar | 145.03770 psi | |
| 20 psi | 1.37895 bar | 20 bar | 290.07540 psi | |
| 50 psi | 3.44738 bar | 50 bar | 725.18850 psi | |
| 100 psi | 6.89476 bar | 100 bar | 1,450.37700 psi | |
| 500 psi | 34.47379 bar | 500 bar | 7,251.88500 psi | |
| 1000 psi | 68.94757 bar | 1000 bar | 14,503.77000 psi |
Symbol: Pa. Commonly used in: metric.
Symbol: kPa. Commonly used in: metric.
Symbol: MPa. Commonly used in: metric.
Symbol: bar. Commonly used in: metric.
Symbol: mbar. Commonly used in: metric.
Every conversion starts with the standard baseline rate between these two units:
Multiply your entered number by the conversion rate to calculate the exact target value:
The result is neatly rounded to your preferred decimal setting so it is clear and ready to use:
| Unit Name | Symbol | System | Conversion Rate | Common Uses |
|---|---|---|---|---|
| Pascal | Pa | metric | 1 Pa = 1.000000 Pa | Everyday, home, and school measurements in Pressure. |
| Kilopascal | kPa | metric | 1 kPa = 1,000.000000 Pa | Everyday, home, and school measurements in Pressure. |
| Megapascal | MPa | metric | 1 MPa = 1,000,000.000000 Pa | Everyday, home, and school measurements in Pressure. |
| Bar | bar | metric | 1 bar = 100,000.000000 Pa | Everyday, home, and school measurements in Pressure. |
| Millibar | mbar | metric | 1 mbar = 100.000000 Pa | Everyday, home, and school measurements in Pressure. |
| Pound per square inch | psi | imperial | 1 psi = 6,894.757293 Pa | Everyday, home, and school measurements in Pressure. |
| Standard Atmosphere | atm | other | 1 atm = 101,325.000000 Pa | Everyday, home, and school measurements in Pressure. |
| Torr (mmHg) | Torr | other | 1 Torr = 133.322368 Pa | Everyday, home, and school measurements in Pressure. |
| Inches of Mercury | inHg | imperial | 1 inHg = 3,386.388667 Pa | Everyday, home, and school measurements in Pressure. |
Evangelista Torricelli invented the mercury barometer in 1643, leading to the millimeter of mercury (mmHg or Torr) unit. Blaise Pascal later demonstrated atmospheric pressure variations with altitude.
Gauge Pressure (psig) measures pressure relative to ambient atmosphere, whereas Absolute Pressure (psia) includes atmospheric baseline (psig + 14.7 = psia).
Divide PSI by 14.5038 (or multiply by 0.068947). For example: 32 PSI / 14.5038 ≈ 2.21 Bar.
1 standard atmosphere (atm) = 1.01325 Bar = 101.325 kPa = 14.6959 PSI.
Every calculation uses trusted, standard definitions so your results are 100% accurate for school, home, work, and recipes.
