# Register bin

Physical unit
Unit name Register bin
Unit symbol ${\ displaystyle \ mathrm {RT}}$
Physical quantity (s) volume
Formula symbol ${\ displaystyle V}$
dimension ${\ displaystyle {\ mathsf {L ^ {3}}}}$
system Anglo-American system of measurement
In SI units ${\ displaystyle \ mathrm {1 \, RT = 2 {,} 831 \, 684 \, 659 \, 2 \; m ^ {3}}}$
Derived from Cubic feet

The register ton (RT) is an outdated unit of measurement for seagoing vessels .

## value

The register ton is exactly 100 cubic feet . This results in:

${\ displaystyle 1RT = 100 \ cdot (0 {,} 3048m) ^ {3} = 2 {,} 831.684.659.2m ^ {3}}$

## Background and story

In order to obtain a measure of value for merchant ships , these are measured. However, since the loading status of merchant ships, for example in contrast to warships with their largely constant total mass, often changes, it is not sufficient to use the water displacement as a benchmark. Therefore, the entire enclosed space of the ship is measured and the crew and engine rooms are deducted from this space, which are not directly related to the cargo of the ship, in order to arrive at the gross and net tonnage of a ship or the gross and net tonnage.

Until July 18, 1994, the register bin was a valid international volume unit. A distinction was made between the gross register tonnage (BRT for short) on the one hand and the net register tonnage (NRT for short) on the other. Since July 1, 1994, the volume of a ship has been calculated in gross tonnage (GT) and net tonnage (NRZ), both of which represent dimensionless numbers . According to the gross tonnage, the fees for the port , canal , lock and pilot are calculated.

## Gross register ton

The gross register ton ( GRT ) or gross register number ( GT , not to be confused with gross tonnage , see above ) is an obsolete measure of the size of merchant ships (since 1969 in Germany, later in Austria) .

1 GRT = 100 cubic feet = 2.8316846592 cubic meters

Although it contains the word ton , the gross registered ton must not be equated with dimensions such as the load capacity . Nor should it be confused with the specification of the standard displacement of warships, the standard barrel .

The article Ship dimensions provides information on current room dimensions for ships .