Ukuran Kuantitatif Kapal

Dimensi Dasar

• Length Overall (LOA) : panjang keseluruhan kapal dari ujung ke ujung. 
• Length on the Waterline (LWL) : panjang dari kedua titik ujung kapal pada garis permukaan air. 
• Length Between Perpendiculars (LBP or LPP) : panjang antara kedua ujung dasar kapal. 
• Beam or breadth (B) : lebar badan kapal. 
• Beam on the Waterline (BWL) : maksimum lebar badan kapal pada garis permukaan air. 
• Depth or moulded depth (D) : jarak vertikal antara dasar kapal ke permukaan kapal.  
• Draft (d) atau (T) : jarak vertikal dari dasar kapal ke garis permukaan air.  
• Freeboard (FB) :  Depth dikurangi draft. 

Berat dan Kapasitas 

• Displacemant Load (ton): berat kapal dan seluruh isinya dengan muatan penuh sampai batas LWL
• Displacement Light (ton): berat kapal tanpa muatan, bahan bakar dan bahan supply/simpanan/stores
• Dead Weight Tonnage (DWT): Berat muatan, bahan bakar dan bahan supply/simpanan/stores yang diisi sampai batas LWL (kapasitas angkut kapal dalam berat – ton)
• Gross Registered Tonnage (GRT/BRT): Total volume kapal. Kapasitas angkut kapal dalam volume (100 cu.ft)
• Net Tonnage: Kapasitas angkut kapal dalam volume dikurangi ruang untuk awak, mesin kapal, mesin-mesin lain dan bahan bakar. 
• Freight/Cargo Tonnage/Netto Registered Tonnage: Sama dgn net tonnage, dalam berat atau vol. Umumnya < 40% DWT
• Ballast: Beban yang diberikan (atau berupa ballast room untuk kapal kargo kering atau kapal penumpang) untuk menambah draft kapal ketika kosong. Ballast umumnya berupa air (laut).

Dead Weight Tonnage

• Deadweight tonnage (also known as deadweight and variously abbreviated as DWT, D.W.T., d.w.t., or dwt) is a measure of how much mass or weight of cargo or burden a ship can safely carry.  Deadweight tonnage was historically expressed in long tons but is now largely replaced internationally by tonnes.  Deadweight tonnage is not a measure of the ship's displacement and should not be confused with terms such as gross register tonnage, net tonnage, or displacement.
• Deadweight tonnage at any given time is defined as the sum of the weights or masses of cargo, fuel, fresh water, ballast water, provisions, passengers and crew.
• The term is often used to denote maximum deadweight. This is the deadweight tonnage when the ship is fully loaded, such that its Plimsoll line is at the point of submersion.

Gross Register Tonnage

• (abbreviated variously as GRT, grt, g.r.t. and so forth) represents the total internal volume of a vessel, with some exemptions for non-productive spaces.  A gross register ton is equal to a volume of 100 cubic feet (~2.83 m³).  Gross Register Tonnage is not a measure of the ship's weight or displacement and should not be confused with terms such as gross tonnage, deadweight tonnage, net tonnage, or displacement.
• This calculation of gross register tonnage is complex; a hold can, for instance, be assessed for grain (accounting for all the air space in the hold) or for bales (exempting the dead space between the ship's ribs). Also, certain non-productive spaces, such as crew's quarters, are exempted from the calculation.
• Gross register tonnage was replaced by gross tonnage in 1994 under the Tonnage Measurement convention of 1969, but is still a widely used term in the industry