Quick guide
How to use this calculator
- Enter the value exactly as recorded, then choose its source unit and the unit you need.
- Check regional and technical qualifiers in the unit names. US and Imperial gallons, force and mass, absolute temperatures and temperature differences, and decimal and binary data prefixes are deliberately separate.
- Use the selected result first, then open the common-equivalents table when you need to compare several standards without re-entering the value.
Calculation method
How the pressure converter works
The entered pressure is converted once to the canonical pascal basis and then from that basis to the selected output unit.
The inHg entry uses a conventional conversion factor; instrument conventions and reference temperatures may differ.
Worked example
Pressure example
One standard atmosphere equals exactly 101,325 Pa and 760 torr.
source value × source-to-pascal relationship → canonical pascal value → destination-unit relationship
Supported inputs
Precision and limits
Unit convention
The inHg entry uses a conventional conversion factor; instrument conventions and reference temperatures may differ.
Precision
Definitions and exact conventional factors are retained internally where available. Display formatting uses up to 12 significant digits; very large or small results use scientific notation. Do not treat displayed digits as measurement accuracy beyond the source value.
Quantity boundary
This page converts pressure. It does not infer a different physical quantity, material property, environmental condition, exchange rate, calendar rule, or regulatory value needed to make a cross-quantity conversion.
Privacy
Entered values and converted results stay in this browser and are not sent to analytics or third parties.
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