Convert Millibars to Baryes

Formula

Ba = mbar × 1000

Derivation from SI units:

• 1 mbar = 10⁻³ bar = 100 Pa = 1 hPa
• 1 Ba = 1 dyn/cm² = 10⁻⁵ N ÷ 10⁻⁴ m² = 0.1 Pa
• 1 mbar = 100 Pa ÷ 0.1 Pa per Ba = 1000 Ba

Both units are defined exactly, so the factor is exact. Millibar definition: millibar; Barye definition: barye.

Worked examples

1. A reading of 20 mbar converts to 20000 Ba.
   20 mbar × 1000 = 20000 Ba
2. A value of 900 mbar is 900000 Ba.
   900 mbar × 1000 = 900000 Ba

Where it's used

Millibars are used for weather maps and barometers (sea level ≈ 1013 mbar), 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.

Millibar 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, "millibar".
• 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.