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Pressure Converter

Convert between pascals, bar, atmospheres, PSI, and mmHg.

Pressure shows up in tire specifications (PSI or bar), weather reports (often in mmHg or hPa), and engineering specs (pascals or atmospheres), and each field tends to favor a different unit by convention, making conversion a recurring practical need rather than a purely academic one.

This converter covers pascals, kilopascals, bar, atmospheres, PSI, and mmHg with exact conversion factors — useful for checking tire pressure specs against a gauge calibrated in a different unit, interpreting weather data, or converting engineering specifications between regional standards.

How to use Pressure Converter

  1. 1

    Enter your value

    Type the pressure you want to convert.

  2. 2

    Select the source unit

    Choose the unit your value is currently in.

  3. 3

    Select the target unit

    Choose the unit you want to convert to.

  4. 4

    Read the result

    The converted value updates instantly.

Features

  • Covers pascals, bar, atmospheres, PSI, and mmHg
  • Exact standards-based conversion factors
  • Instant live conversion
  • Useful for tire pressure, weather, and engineering specs

Frequently asked questions

Common mistakes to avoid

  • Confusing gauge pressure (relative to atmospheric pressure, common for tires) with absolute pressure — this converter performs unit conversion only, not gauge/absolute adjustment.
  • Using a rough mental estimate for bar-to-PSI conversion when checking a precise specification.
Written by Converter Portal Editorial TeamPublished February 17, 2026Last updated June 1, 2026

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