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🔄 Conversion

Pressure Converter

Convert pressure across pascals (Pa, kPa, MPa), bar, atmospheres, psi, mmHg (torr) and inHg. Essential for engineering, weather, tyre inflation and HVAC.

Last reviewed: January 2026 Formula shown No signup required

Educational estimate. Calculator results are for planning and information only, not financial, tax, medical, legal, or engineering advice. Verify important decisions with official sources or a qualified professional.

Pressure Converter

Pa, kPa, MPa, bar, psi, atm, mmHg

Enter any number (decimals allowed).

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📐 Formula & Method

Linear conversion

result = value × (factor_from / factor_to)

All units are stored as a multiplier against an internal base unit. To convert, the input is first scaled to the base, then divided by the target factor.

📋 How to Use

  1. 1

    Enter the numeric value you want to convert.

  2. 2

    Pick the source unit in the From dropdown.

  3. 3

    Pick the target unit in the To dropdown.

  4. 4

    Click Calculate. You will see the result, a full conversion table to every supported unit, and a list of common conversions.

💡 Key Insights

  • 1 bar = 100,000 Pa ≈ atmospheric pressure at sea level.

  • 1 atmosphere = 101,325 Pa = 14.696 psi = 760 mmHg exactly (by definition).

  • Tyre pressure: 32 psi ≈ 2.21 bar — the typical car tyre pressure in both systems.

  • Weather barometric pressure is reported in hPa (= mbar) in most of the world; inHg in the US.

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🔬 Methodology & Accuracy

Formula: Linear unit conversion with high-precision constants. All math runs client-side in your browser using IEEE-754 doubles.

Data sources: BIPM SI brochure (9th ed.); NIST SP 811 (2008 ed.); ISO 80000-1 quantities and units.

Last reviewed: January 2026 · Accuracy: Results are precise to two decimal places using IEEE-754 double-precision arithmetic. Intended for educational and planning use only.

For informational purposes only. Results are estimates based on the inputs and formulas provided. For financial, tax, medical, or legal decisions, consult a qualified professional. Rates and regulations change — always verify current figures with official sources.

Accuracy & Feedback

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❓ Frequently Asked Questions

🧭 Next Steps

Complete your Conversion picture

These tools naturally pair with the Pressure Converter — use them in order to get a full view.

1

Temperature Converter

Pressure and temperature are coupled in gas laws (PV=nRT).
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