How to Convert Pressure Units
Enter the pressure value you want to convert in the Value field.
Select the unit you are converting from in the From list.
Select the unit you want to convert to in the To list.
The result appears instantly below the unit selectors.
Key Features
37 Pressure Units
Covers SI units (pascal, kPa, MPa), practical units (bar, PSI, atm), mercury and water column units (mmHg, inHg, ftH₂O), and force-based units (kgf/cm², lbf/ft², pdl/ft²).
Precise Results
Uses exact base multipliers relative to pascal. Results show up to 10 significant figures without trailing zeros, switching to scientific notation automatically for extreme values.
Works Offline
All conversions run entirely in your browser. No internet connection is needed after the page loads.
Privacy-First
No data is ever sent to a server. Your values stay on your device.
Privacy & Security
This tool runs entirely in your browser. No values are transmitted to any server, stored, or logged. It is safe to use with sensitive measurements or in offline environments.
Frequently Asked Questions
What is the difference between bar and PSI?
Bar and PSI (pounds per square inch) are both common pressure units. 1 bar equals approximately 14.504 PSI. Bar is used widely in Europe and scientific contexts, while PSI is standard in the US.
What is a pascal (Pa)?
The pascal is the SI unit of pressure, equal to one newton per square metre. It is a very small unit — standard atmospheric pressure is about 101,325 Pa or 101.325 kPa.
What is the difference between mmHg and torr?
Millimeter of mercury (mmHg) and torr are nearly identical: 1 torr is defined as exactly 1/760 of a standard atmosphere (133.322 Pa), while 1 mmHg is based on the physical height of a mercury column and equals 133.322 Pa to six significant figures. They are interchangeable for practical purposes.
What base unit is used for conversions?
All conversions pass through pascal (Pa) as the internal base unit. Each unit is stored as its exact value in pascals, so any pair of units can be converted without a lookup table.
Can I convert gauge pressure with this tool?
This tool converts between pressure units using absolute values. Gauge pressure conversions (relative to atmospheric pressure) require adding or subtracting the reference pressure manually.