Convert psi to Decibars

Formula

dbar = psi × 0.6894757293168

or dbar = psi ÷ 1.450377377302

Derivation from SI units:

• 1 psi = 1 lbf/in² = (0.45359237 kg × 9.80665 m/s²) ÷ (0.0254 m)² = 6894.757293168 Pa
• 1 dbar = 10⁻¹ bar = 10⁴ Pa
• 1 psi = 6894.757293168 Pa ÷ 10000 Pa per dbar = 0.6894757293168 dbar

Both units are defined exactly, so the factor is exact. psi definition: psi; Decibar definition: decibar.

Worked examples

1. A reading of 14.7 psi converts to 10.13529322 dbar.
   14.7 psi × 0.6894757293 = 10.13529322 dbar
2. A value of 60 psi is 41.36854376 dbar.
   60 psi × 0.6894757293 = 41.36854376 dbar

Where it's used

psi are used for tyre pressure in the United States (about 30–35 psi for cars), 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.

psi 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, "pound-force per square inch (psi)".
• 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.