Pressure Converter
Just pick a value and unit to convert across the major pressure units at once: Pa, kPa, MPa, hPa, bar, atm, mmHg, psi, kgf/cm² and meters of water. Handy for weather, plumbing, tire pressure and more.
Last updated:
Input
Input unit
atm（Atmosphere (standard)）
Result
1 atm converted to pascals
101,325Pa
| Unit | Name | Converted value |
|---|---|---|
| Pa | Pascal | 101,325 |
| hPa | Hectopascal | 1,013.25 |
| kPa | Kilopascal | 101.325 |
| MPa | Megapascal | 0.101325 |
| bar | Bar | 1.01325 |
| atm | Atmosphere (standard) | 1 |
| mmHg | Millimeter of mercury (Torr) | 760.0021 |
| psi | Pounds per square inch | 14.695949 |
| kgf/cm² | Kilogram-force per square centimeter | 1.033227 |
| mH₂O | Meter of water column | 10.332275 |
How it works
- Supports 10 units: pascal (Pa), hectopascal (hPa), kilopascal (kPa), megapascal (MPa), bar, atmosphere (atm), millimeter of mercury (mmHg/Torr), psi (pounds per square inch), kgf/cm² and meter of water column (mH₂O).
- Pascal (Pa) is the conversion base. Your input is first normalized to pascals and then converted to every other unit, so you can convert between any units regardless of the one you start from.
- Enter a number and choose the source unit, and the conversions to all supported units are listed in a table. The pascal (Pa) value is shown large at the top as the representative figure.
- The key reference values used are 1 bar = 100,000 Pa, 1 atm = 101,325 Pa, 1 mmHg = 133.322 Pa, 1 psi = 6,894.757 Pa and 1 kgf/cm² = 98,066.5 Pa.
- Extremely large or small magnitudes are shown in exponential notation; otherwise trailing decimal digits are trimmed for readability.
- Displayed values are rounded approximations. For precise measurement, design or trade, follow the relevant standards and significant-figure rules.
Frequently asked questions
- How does the pressure converter work?
- Pascals (Pa) are the base unit: your value is converted to Pa first, then out to each other unit. It uses definitions such as 1 bar = 100,000 Pa, 1 atm = 101,325 Pa, and 1 mmHg = 133.322 Pa.
- How many hPa and mmHg are in one atmosphere?
- One atmosphere (atm) equals 101,325 Pa, which is 1013.25 hPa and 760 mmHg. This lets you line up the hectopascals used in weather reports with the mmHg used for blood pressure on one scale.
- Can I use it for tire pressure in psi or kgf/cm²?
- Yes. It supports psi (1 psi = 6,894.757 Pa) and kgf/cm² (1 kgf/cm² = 98,066.5 Pa), so 1 kgf/cm² is about 14.2 psi. That makes it handy for tire pressure and piping applications.
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