Pressure Converter
Convert pressure values between SI, weather, tire, vacuum, and engineering units. The converter routes every value through pascals and shows the surrounding units in a full comparison table.
Base unit
pascal
Supported units
11
Includes
psi + bar + atm
Live converter
Pressure conversion inputs
Enter a value, choose the source and target units, then inspect the full table for related physical units.
Converted result
101.325 kPa
Input
1 atm
Output unit
kPa
Base method
pascals
Pressure in every supported unit
| Unit | Converted value | Unit name |
|---|---|---|
| Pa | 101,325 | Pascals |
| kPa | 101.325 | Kilopascals |
| MPa | 0.101325 | Megapascals |
| bar | 1.01325 | Bar |
| mbar | 1,013.25 | Millibar |
| atm | 1 | Standard atmospheres |
| psi | 14.6959487755 | Pounds per square inch |
| psf | 2,116.2166236888 | Pounds per square foot |
| Torr | 760 | Torr |
| mmHg | 759.9998917256 | Millimeters of mercury |
| inHg | 29.9212524019 | Inches of mercury |
Convert pressure for tires, weather, labs, and engineering
Gauge readings
Convert psi, kPa, bar, and MPa for tires, compressors, hydraulics, and pressure gauges.
Weather and atmosphere
Compare millibars, kilopascals, atmospheres, and inches of mercury for weather and altitude references.
Lab and vacuum work
Convert Torr, mmHg, pascals, and atmospheres for laboratory and vacuum-pressure notes.
Pressure conversion formula
The converter normalizes pressure to pascals before scaling into the selected target unit.
Working formulas
Base conversion
pascals = value x pascals per source unit
Every input pressure is first converted into pascals.
Target value
target value = pascals / pascals per target unit
The pascal value is divided by the target unit factor.
Standard atmosphere
1 atm = 101325 Pa
The standard atmosphere anchors atm, Torr, and related references.
Symbols
- Pa - pascal
- The SI-derived pressure unit used as the base route.
- factor - pressure factor
- The number of pascals represented by one selected unit.
Why pressure conversion needs clear labels
Many contexts in one table
- The converter includes SI pressure units, bar, atmospheres, psi, psf, Torr, mmHg, and inHg.
- Weather-style and gauge-style units can be compared without switching tools.
- The table helps users see scale differences between pascals, kilopascals, psi, and bar.
Pascal-based method
- Every pressure conversion is normalized to pascals first.
- The standard atmosphere relationship is visible in the formula section.
- Torr and mercury-column units are labeled separately to reduce ambiguity in lab notes.
Useful for pressure-sensitive work
Mechanical systems
Convert psi, kPa, bar, and MPa for tires, pumps, compressors, hydraulics, and gauges.
Weather references
Compare mbar, kPa, atm, and inHg when reading forecasts and barometric pressure values.
Labs and vacuum
Convert pascals, Torr, mmHg, and atmospheres for vacuum systems and laboratory references.
How it works in three quick steps.
Enter pressure
Type a pressure from a gauge, tire label, weather report, lab note, or engineering specification.
Choose source and target units
Select pascals, kilopascals, bar, atmospheres, psi, Torr, millimeters of mercury, or related units.
Review the pascal table
Use the full table to compare the same pressure across SI, weather, vacuum, and inch-pound units.
Save pressure conversions with context
Copy selected result
Copy the source-to-target pressure result with labels for reports, tickets, and lab notes.
Print the pressure table
Print all supported units when comparing gauge, weather, vacuum, and SI pressure values.
Reference the formula
Use the pascal formula notes to explain which pressure factor was applied.
About this pressure converter
Pressure units appear in several worlds at once. A tire label may show psi and kPa, a forecast may use millibars or inches of mercury, a lab note may use Torr or mmHg, and an engineering specification may use pascals, kilopascals, megapascals, or bar. This converter keeps those units in one pascal-based workflow.
The page separates similar-looking labels such as psi and psf, and it keeps atmosphere, Torr, and mercury-column units visible for laboratory and weather work. That matters because pressure mistakes can change equipment settings, experimental conditions, and safety margins.
The formula section shows the pascal route so the conversion can be checked. This is especially useful when copying pressure values into reports, tickets, calculations, or specifications where the unit label is as important as the number.
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