Weather working day calculator

A weather working day (WWD) is a day on which weather permits cargo work; periods of bad weather are excluded from laytime. Compute counted laytime by subtracting weather-affected hours from elapsed hours.

CharteringLaytimeWeather

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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

\text{WWD} = \text{Elapsed} - \text{Weather lost}

Symbol	Meaning	Unit
$Elapsed$	Hours during cargo operations	h
$Weather lost$	Hours lost to bad weather	h

Source: BIMCO LAYTIMEDEFS 2013

In short

Convert elapsed hours into weather working hours by subtracting bad-weather time.

Learn the theory Laytime: Voyage Charter Time Accounting