Convert Inches of Mercury to Baryes

Formula

Ba = inHg × 33863.88640341

Derivation from SI units:

• 1 inHg = 13 595.1 kg/m³ × 9.80665 m/s² × 0.0254 m = 3386.388640341 Pa
• 1 Ba = 1 dyn/cm² = 10⁻⁵ N ÷ 10⁻⁴ m² = 0.1 Pa
• 1 inHg = 3386.388640341 Pa ÷ 0.1 Pa per Ba = 33863.88640341 Ba

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

Worked examples

1. A reading of 15 inHg converts to 507958.2961 Ba.
   15 inHg × 33863.8864 = 507958.2961 Ba
2. A value of 29 inHg is 982052.7057 Ba.
   29 inHg × 33863.8864 = 982052.7057 Ba

Where it's used

Inches of Mercury are used for aircraft altimeter settings (standard 29.92 inHg), while baryes appear in older physics and acoustics literature. Both measure pressure, stress and differential pressure (force per unit area), so the conversion is a fixed factor.

Inch of Mercury 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, "inch of mercury, conventional (inHg)".
• 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, "dyne per square centimeter (dyn/cm²)".

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