Pressure Converter

Pressure converter: convert psi, bar, kPa, atm, and pascal instantly for tires, HVAC, hydraulics, and scuba tanks. Free and private, runs in your browser.

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Last verified July 2026

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Direct answer

What does this converter do?

Pressure converter: convert psi, bar, kPa, atm, and pascal instantly for tires, HVAC, hydraulics, and scuba tanks. Free and private, runs in your browser.

  • 1 psi = 6.895 kilopascal · 1 bar = 1e+05 pascal · 1 atmosphere = 101.3 kilopascal
  • All conversions route through the pascal as the base unit, so every pair of units agrees regardless of which two you enter.
  • Standard factors are shown in the formula panel at the precision the calculator actually uses, so the arithmetic and the panel agree.
32 psi converted to kPa, bar and atm step by step
32 psi is exactly 220.63232 kPa before display rounding.

Reference factors (pressure)

Exact factors in terms of the pascal, from NIST standards:

  • 1 pascal = 1 pascal
  • 1 kilopascal = 1000 pascal
  • 1 psi = 6894.76 pascal
  • 1 bar = 100000 pascal
  • 1 atmosphere = 101325 pascal
Formula & evidence

How this calculator works

Reviewed 2026-09-20 · BoringToolsKit Editorial Team

Formula

Converts to kilopascals first (bar x 100, psi x 6.89476, atm x 101.325), then divides by the target unit factor, since 1 atm = 101.325 kPa and 1 bar = 100 kPa.

Worked example

1 psi = 6.895 kilopascal · 1 bar = 1e+05 pascal · 1 atmosphere = 101.3 kilopascal

Sources

Sources support the method, terminology, or planning context. Editable assumptions remain your responsibility.

Assumptions to verify

  • Inputs are treated as exact decimal values.
  • Standard (not historical or survey) unit definitions are used.
  • The calculation uses the factors at the precision shown in the formula panel; rounding beyond that is display-only and adds no accuracy.

Frequently asked questions

Why convert through pascal instead of directly?

Routing every unit through a single base (pascal) means each unit needs only one exact factor against the standard, and any pair combines cleanly. Direct pair factors drift apart over time in hand-maintained tables; a base-unit graph cannot.

Where do these exact factors come from?

From published standards (NIST: SP 811 pressure conversions). Units like the inch are defined exactly (1 in = 2.54 cm since 1959), so conversions between standard units are exact, not approximate.

How many decimal places should I trust?

The math is exact to the precision shown. The practical limit is your input: a gauge or transducer is usually specified to 3-4 significant figures, so extra digits beyond your reading do not add accuracy.

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Cite this tool

BoringToolsKit. “Pressure Converter.” boringtoolskit.com/pressure-converter/ (reviewed 2026-09-20). Free to reference in articles, syllabi, and answer posts with a link.

Privacy: Inputs and results stay in this browser. Conversion runs locally in your browser; review the output before relying on it.

Worked example: 32 psi step by step

Take a tire spec of 32 psi and convert it by hand using the same math the tool runs. Step 1: convert psi to kilopascals with the exact factor 6.89476, so 32 x 6.89476 = 220.63232 kPa. The calculator keeps full precision internally and rounds only at display, which is why it shows 220.63 kPa rather than 220.63 followed by drifted decimals.

Step 2: split that kilopascal figure into the other units. Bar is exactly 100 kPa, so 220.63232 / 100 = 2.2063 bar. Atmospheres use 101.325 kPa, so 220.63232 / 101.325 = 2.1776 atm. Back-checking psi, 220.63232 / 6.89476 returns 32.0000, confirming the round trip closes to four decimal places.

The same logic runs in reverse for metric sources. A compressor rated at 8 bar is 800 kPa, and 800 / 6.89476 = 116.0303 psi. If a gauge reads 2.5 atm, that is 2.5 x 101.325 = 253.31 kPa, or 36.7411 psi. Doing one manual pass like this is a fast way to trust the tool: any converter that disagrees with these six numbers by more than the last decimal place is using a rounded factor.

Where pressure conversions go wrong in practice

Gauge versus absolute pressure is the classic trap. A tire gauge reading 32 psi is psig: it already subtracts atmospheric pressure. In absolute terms that is about 46.7 psia at sea level, since 14.696 psi of atmosphere sits on top. Converting 32 psi to 220.63 kPa is only correct if you mean gauge pressure. Pump and vacuum specs often quote absolute values, so mixing the two skews results by a full atmosphere, roughly 101.3 kPa or 1.013 bar.

Altitude shifts the baseline too. Atmospheric pressure drops about 1.2 kPa per 100 m of elevation, so in Denver (roughly 1,600 m) ambient air is near 83 kPa, not 101.325. An absolute reading of 220 kPa there corresponds to a gauge reading closer to 137 kPa, a 38 percent gap that no unit factor will fix.

Also watch for non-SI bar variants. The tool uses the standard bar (100,000 Pa), but some European gauge documentation from before 1980 used the technical atmosphere (at, 98,066.5 Pa), about 2 percent smaller. And the psi factor here is exact to 6.89476 kPa; older references using 6.895 or 6.89 agree only to about 4 significant figures, which matters when chaining conversions through several units.