Convert Decibars to Inches of Water (60 °F)

Formula

inH₂O (60 °F) = dbar × 40.18646519852

Derivation from SI units:

• 1 dbar = 10⁻¹ bar = 10⁴ Pa
• 1 inH₂O (60 °F) ≈ 999.0 kg/m³ × 9.80665 m/s² × 0.0254 m ≈ 248.84 Pa
• 1 dbar = 10000 Pa ÷ 248.84 Pa per inH₂O (60 °F) = 40.18646519852 inH₂O (60 °F)

One unit is a measured value, so the factor is approximate. Decibar definition: decibar; Inch of Water (60 °F) definition: inch of water (60 °F).

Worked examples

1. A reading of 50 dbar converts to 2009.32326 inH₂O (60 °F).
   50 dbar × 40.1864652 = 2009.32326 inH₂O (60 °F)
2. A value of 1000 dbar is 40186.4652 inH₂O (60 °F).
   1000 dbar × 40.1864652 = 40186.4652 inH₂O (60 °F)

Where it's used

Decibars are used for oceanography: CTD instruments report sea pressure in dbar, while inches of water (60 °F) appear in older US gas-industry and flow-meter references. Both measure pressure, stress and differential pressure (force per unit area), so the conversion is a fixed factor.

Decibar 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, "bar", with SI prefix deci (10⁻¹).
• 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 water (60 °F)".

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