Newtons per Square Millimetre to Decibars (N/mm2 to dbar)

Formula

dbar = N/mm² × 100

Derivation from SI units:

• 1 N/mm² = 1 N ÷ 10⁻⁶ m² = 10⁶ Pa = 1 MPa
• 1 dbar = 10⁻¹ bar = 10⁴ Pa
• 1 N/mm² = 1000000 Pa ÷ 10000 Pa per dbar = 100 dbar

Both units are defined exactly, so the factor is exact. Newton per Square Millimetre definition: newton per square millimetre; Decibar definition: decibar.

Worked examples

1. A reading of 30 N/mm² converts to 3000 dbar.
   30 N/mm² × 100 = 3000 dbar
2. A value of 275 N/mm² is 27500 dbar.
   275 N/mm² × 100 = 27500 dbar

Where it's used

Newtons per Square Millimetre are used for steel yield and tensile strength (S355: 355 N/mm²), while decibars appear in oceanography: CTD instruments report sea pressure in dbar. Both measure pressure, stress and differential pressure (force per unit area), so the conversion is a fixed factor.

Newton per Square Millimetre 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 4, coherent derived units with special names.
• 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", with SI prefix deci (10⁻¹).

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