Convert Gigapascals to Millibars (GPa to mbar)

Formula

mbar = GPa × 10000000

Derivation from SI units:

• 1 GPa = 10⁹ Pa = 1000 MPa = 1 kN/mm²
• 1 mbar = 10⁻³ bar = 100 Pa = 1 hPa
• 1 GPa = 1000000000 Pa ÷ 100 Pa per mbar = 10000000 mbar

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

Worked examples

1. A reading of 10 GPa converts to 100000000 mbar.
   10 GPa × 10000000 = 100000000 mbar
2. A value of 190 GPa is 1900000000 mbar.
   190 GPa × 10000000 = 1900000000 mbar

Where it's used

Gigapascals are used for young's modulus and shear modulus of metals, ceramics and composites, while millibars appear in weather maps and barometers (sea level ≈ 1013 mbar). Both measure pressure, stress and differential pressure (force per unit area), so the conversion is a fixed factor.

Gigapascal to other pressure units

Frequently asked questions

Sources

• The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 7, SI prefixes.
• 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".

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