Pressure Converter

Tires, weather maps, labs, and scuba gear reuse the word “pressure” with different zero points—know which reference you mean.

From:

To:

0.000000

Conversion Result

1 Pascal = 0.000000 PSI

1 Pascal = 0.000145 PSI

Pressure in the wild (not just homework)

Automotive & cycling: PSI and bar on tire sidewalls, pumps, and TPMS readouts.
Weather: hectopascals (same numeric value as millibar) on synoptic charts.
Labs & medicine: kPa, mmHg/Torr lineages for vacuum, blood pressure context (interpretation still needs clinical training).
Industry: bar and PSI for pneumatics; atmosphere references in process datasheets.

Internal math normalizes through Pascal for all 8 units.

Quick comparisons

1 bar is intentionally close to average sea-level atmosphere but not identical—1 atm ≈ 1.01325 bar.
A 32 PSI tire target (gauge) is a everyday number; converting it to pascals still does not add atmospheric offset unless you decide to.
Weather apps quoting 1013 hPa are using the same unit family as kPa (1 hPa = 0.1 kPa).

Still easy to get wrong

Forgetting whether a sensor reads gauge or absolute before comparing to weather pressure.
Mixing up depth in water (≈1 atm per 10 m saltwater, rule-of-thumb) with the numbers in this dry unit table without a dive table.
Treating inHg mercury columns like generic PSI without checking temperature corrections for precision lab work.

Pressure FAQs with teeth

Does this converter assume gauge pressure or absolute pressure?

The numbers are neutral: they only translate between unit names. Tire gauges and shop compressors usually quote gauge pressure (relative to atmosphere). Altitude, weather, and vacuum systems often use absolute pressure. Add or subtract ~1 atm when you need to move between conventions—know which reference your source already uses.

Why do Torr and mmHg come out the same here?

Under standard definitions used in conversion tables, one millimeter of mercury and one Torr are treated as the same pressure increment (both tied to the mercury column idea). For rough work they are interchangeable; for metrology papers, cite the standard your lab follows.

When would I pick bar instead of atmosphere?

One bar is defined as exactly 100,000 Pa—handy round number for engineering. One standard atmosphere is ~101,325 Pa. Weather maps often use hectopascals (hPa), which are kilopascals without the prefix confusion. Bars show up on European tire pumps and industrial pneumatics.

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