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.
Weather working hours
68.00h
Weather working days
2.833d
Formula
$$\text{WWD} = \text{Elapsed} - \text{Weather lost}$$
Charters may specify 'serious' weather only or 'any' weather. Some require a weather report or port log entry as evidence. WIBON (whether in berth or not) clauses interact with WWD; check both.
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