Froude Number

Dimensionless speed ratio that drives wave-making resistance behaviour.

ResistanceHydrodynamics

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This calculator requires JavaScript to compute its result. The formula, symbols, and regulatory sources are shown in the Formula section below.

Formula, assumptions, and limits

Fn = \frac{V}{\sqrt{g \cdot L}}

Symbol	Meaning	Unit
$V$	Ship speed	m/s
$g$	Gravitational acceleration	m/s²
$L$	Waterline length	m
$Fn$	Froude number

Source: SNAME PNA Vol II

Dimensionless speed ratio that drives wave-making resistance behaviour.