Convert Kilopascals to Inches of Water (60 °F)

Formula

inH₂O (60 °F) = kPa × 4.018646519852

Derivation from SI units:

• 1 kPa = 10³ Pa
• 1 inH₂O (60 °F) ≈ 999.0 kg/m³ × 9.80665 m/s² × 0.0254 m ≈ 248.84 Pa
• 1 kPa = 1000 Pa ÷ 248.84 Pa per inH₂O (60 °F) = 4.018646519852 inH₂O (60 °F)

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

Worked examples

1. A reading of 20 kPa converts to 80.3729304 inH₂O (60 °F).
   20 kPa × 4.01864652 = 80.3729304 inH₂O (60 °F)
2. A value of 300 kPa is 1205.593956 inH₂O (60 °F).
   300 kPa × 4.01864652 = 1205.593956 inH₂O (60 °F)

Where it's used

Kilopascals are used for tyre pressure outside the United States (about 200–250 kPa for cars), 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.

Kilopascal 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, "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.