Tonnes per Centimetre Immersion (TPC)
TPC = waterplane area × water density ÷ 100. The quick hydrostatic derivative every mate uses to convert a planned cargo mass into a draft change.
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Formula, assumptions, and limits
| Symbol | Meaning | Unit |
|---|---|---|
| Waterplane area | m² | |
| Water density | t/m³ | |
| Tonnes per centimetre immersion | t/cm |
Source: Derrett & Barrass - *Ship Stability for Masters and Mates* Ch.6; SNAME - Principles of Naval Architecture Vol I
In short
Compute TPC from waterplane area and water density - sea, fresh, or brackish dock water.