Convert Bar to Inches of Mercury

Formula

inHg = bar × 29.52998330101

Derivation from SI units:

• 1 bar = 10⁵ Pa (exact, by definition)
• 1 inHg = 13 595.1 kg/m³ × 9.80665 m/s² × 0.0254 m = 3386.388640341 Pa
• 1 bar = 100000 Pa ÷ 3386.388640341 Pa per inHg = 29.52998330101 inHg

Both units are defined exactly, so the factor is exact. Bar definition: bar; Inch of Mercury definition: inch of mercury.

Worked examples

1. A reading of 2 bar converts to 59.0599666 inHg.
   2 bar × 29.5299833 = 59.0599666 inHg
2. A value of 10 bar is 295.299833 inHg.
   10 bar × 29.5299833 = 295.299833 inHg

Where it's used

Bar are used for compressed air and pneumatics (6–8 bar), while inches of mercury appear in aircraft altimeter settings (standard 29.92 inHg). Both measure pressure, stress and differential pressure (force per unit area), so the conversion is a fixed factor.

Bar to other pressure units

Frequently asked questions

Sources

• Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "bar".
• Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "inch of mercury, conventional (inHg)".

Last reviewed: 2026-10-15. Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.