Inches per Hour to Centimetres per Second (in/h to cm/s)

Formula

cm/s = in/h × 0.0007055555555556

or cm/s = in/h ÷ 1417.322834646

Derivation from SI units:

• 1 in/h = 0.0254/3600 m/s.
• 1 cm/s = 0.01 m/s.
• 1 in/h = 0.000007055555555556 m/s ÷ 0.01 m/s per cm/s = 0.0007055555555556 cm/s

Both units are defined exactly, so the factor is exact. Inch per Hour definition: inch per hour; Centimetre per Second definition: centimetre per second.

Worked examples

1. A reading of 0.5 in/h converts to 0.0003527777778 cm/s.
   0.5 in/h × 0.0007055555556 = 0.0003527777778 cm/s
2. A value of 3 in/h is 0.002116666667 cm/s.
   3 in/h × 0.0007055555556 = 0.002116666667 cm/s

Where it's used

Inches per Hour are used for USDA soil survey permeability classes, while centimetres per second appear in constant-head and falling-head permeability tests. Both measure hydraulic conductivity (coefficient of permeability k), so the conversion is a fixed factor.

Inch per Hour to other hydraulic conductivity 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".
• The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 4 (derived units) and Table 8 (non-SI units accepted for use with the SI).

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