Enter the boat length (ft), the boat breadth (ft), and the boat depth (ft) into the Boat Gross Tonnage Calculator. The calculator will evaluate the Boat Gross Tonnage.

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## Boat Gross Tonnage Formula

The following formula is used to calculate the Boat Gross Tonnage.

BGT = .5*BL*BD*BW /100

Variables:

- BGT is the Boat Gross Tonnage (tonnage)
- BL is the boat length (ft)
- BD is the boat breadth (ft)
- BW is the boat depth (ft)

To calculate the boat gross tonnage, multiply the boat length, breadth, and depth together, divide by 2, then finally divide by 100.

## How to Calculate Boat Gross Tonnage?

The following steps outline how to calculate the Boat Gross Tonnage.

- First, determine the boat length (ft).
- Next, determine the boat breadth (ft).
- Next, determine the boat depth (ft).
- Next, gather the formula from above = BGT = .5*BL*BD*BW /100.
- Finally, calculate the Boat Gross Tonnage.
- After inserting the variables and calculating the result, check your answer with the calculator above.

**Example Problem:**

Use the following variables as an example problem to test your knowledge.

boat length (ft) = 40

boat breadth (ft) = 10

boat depth (ft) = 8

BGT = .5*BL*BD*BW /100 =** ** ?