Wedge Calculator is a standalone app for calculating ROB in cargo tanks using the wedge formula. Any values entered are stored in app settings and retrieved the next time the app is opened. All values can be entered either in SI Metric or Imperial units. When you press the button to switch between the two, any text in the fields is automatically converted (M3 <-> Bbls and Mtrs/cmtrs <-> feet, inches. The wedge volume can be calculated based on tank dimensions or basis volume taken from the ship's tank calibration table. In that case the volume at even keel must be taken from the table, NOT the trim corrected value.