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

Elapsed hours during cargo operationshHours lost to bad weather (rain, swell, wind)h

Weather working hours: 68.00h

Weather working days: 2.833d

Changing the inputs requires JavaScript. The calculator above shows its default inputs and 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