Convert Inches of Water (60 °F) to Decibars

Formula

dbar = inH₂O (60 °F) × 0.024884

or dbar = inH₂O (60 °F) ÷ 40.18646519852

Derivation from SI units:

• 1 inH₂O (60 °F) ≈ 999.0 kg/m³ × 9.80665 m/s² × 0.0254 m ≈ 248.84 Pa
• 1 dbar = 10⁻¹ bar = 10⁴ Pa
• 1 inH₂O (60 °F) = 248.84 Pa ÷ 10000 Pa per dbar = 0.024884 dbar

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

Worked examples

1. A reading of 0.5 inH₂O (60 °F) converts to 0.012442 dbar.
   0.5 inH₂O (60 °F) × 0.024884 = 0.012442 dbar
2. A value of 7 inH₂O (60 °F) is 0.174188 dbar.
   7 inH₂O (60 °F) × 0.024884 = 0.174188 dbar

Where it's used

Inches of Water (60 °F) are used for older US gas-industry and flow-meter references, 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.

Inch of Water (60 °F) 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, "inch of water (60 °F)".
• 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.