Pressure Converter

Convert between pascals, bar, psi, atmospheres, mmHg, and torr pressure units instantly.

Pressure Converter tool

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Example

Input: 32 psi (a typical car tire pressure) to bar

Result: 2.206322 bar

1 psi = 6,894.757 Pa and 1 bar = 100,000 Pa, so 32 x 6,894.757 / 100,000 = 2.206322 bar.

Common Pressures in Every Unit

PressurePabarpsiatm
1 atm101,3251.0132514.695951
1 bar100,000114.503770.98692
1 psi6,894.760.0689510.06805
32 psi (car tire)220,632.232.20632322.17747
2.5 bar250,0002.536.259432.46731
220 kPa220,0002.231.90832.17123
120 mmHg15,998.690.159992.320410.15789
760 torr101,3251.0132514.695951

Values from this converter, rounded to 2 decimals (Pa) or 5 decimals (other units).

  1. Select the pressure unit you are converting from (Pa, bar, psi, atm, mmHg, or torr).
  2. Enter the pressure value in the input field.
  3. View all equivalent pressure values across the other five supported units displayed below.
  4. Use the results for tire pressure checks, weather data, medical readings, or engineering specs.
  5. Click the copy icon next to any converted pressure value to copy it to your clipboard.
  6. Reference the standard atmosphere equivalents in the Formula section to verify your conversions.

PSI, Bar, Pascals and mmHg Explained

One bar is 14.5 psi, and one psi is 0.0689 bar. Standard atmospheric pressure is 101,325 pascals, which is about 14.7 psi or 1.013 bar. This converter handles pascals, bar, psi, atmospheres, millimeters of mercury (mmHg) and torr, and shows them all at once.

Different fields stick to different units. Car tires use psi in the US and bar or kPa in much of Europe, so 32 psi is about 2.2 bar. Weather maps use hectopascals, where 1 hPa is 100 Pa. Doctors record blood pressure in mmHg. Vacuum pumps and lab gear often use torr.

Kilopascals are not a separate choice here, but they are easy to enter. Multiply kPa by 1,000 to get pascals, so 220 kPa becomes 220,000 Pa. Or use bar, because 100 kPa is exactly 1 bar.

The main pitfall is gauge versus absolute pressure. A tire gauge shows pressure above the air around you. The absolute pressure inside the tire is higher by about 14.7 psi. This converter changes units only. It does not add or remove that atmospheric part, so keep both numbers on the same basis.

For gas law problems, pair it with the Temperature Converter. Those formulas need absolute temperatures in kelvin as well as absolute pressures.

Formula / How It Works

1 atm = 101,325 Pa = 1.01325 bar = 14.6959 psi = 760 mmHg = 760 torr

Sources

Frequently Asked Questions

Multiply psi by 0.0689476. So 30 psi is 2.07 bar, and 32 psi is 2.21 bar. To go from bar to psi, multiply by 14.5038, which turns 2.5 bar into 36.3 psi. Tire gauges and pumps often show both scales side by side.
Multiply kPa by 0.145038, or divide by 6.895. A common European tire pressure of 220 kPa is 31.9 psi. This converter works in pascals rather than kilopascals, so multiply kPa by 1,000 first. Enter 220 kPa as 220,000 Pa, or use bar, since 100 kPa is exactly 1 bar.
One standard atmosphere is 101,325 Pa, 1.01325 bar, 14.696 psi and 760 torr. It is a reference value for sea level, not the pressure on any given day. Weather maps show it as 1013.25 hPa. In mmHg the converter shows 759.999892, because mmHg is defined in a slightly different way from the torr.
For almost every purpose, yes. A torr is exactly 1/760 of a standard atmosphere. A millimeter of mercury is defined from the weight of a mercury column. The two differ by less than 0.000015 percent, far below what any gauge can show. Medicine uses mmHg, while vacuum work tends to use torr.
Early blood pressure cuffs read pressure from the height of a column of mercury, and the unit stayed even after digital monitors took over. A reading of 120 mmHg is about 16 kPa or 2.32 psi. For what a reading means for your health, ask a doctor rather than relying on a unit converter.

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