Trim Calculator

Compute change of trim and drafts using MCT 1 cm and LCF. Sign convention: +TM = trim by stern.

Method

Pick based on available data.

L_pp (m)

LCF from midship (m, +aft)

Used to split total trim into draft changes at FP/AP.

T_F0 (m)

T_A0 (m)

A) Known MCT 1 cm & Trimming Moment

Trimming Moment TM (t·m)

+TM = trim by stern. Use builder below if needed.

MCT 1 cm (t·m/cm)

Enter weight (t) and longitudinal arm from midship (m, +aft). TM = Σ(w·x).

w₁ (t)

x₁ (m)

w₂ (t)

x₂ (m)

w₃ (t)

x₃ (m)

w₄ (t)

x₄ (m)

w₅ (t)

x₅ (m)

Total trim t: — m (— cm)

ΔT_A (at AP): — m

ΔT_F (at FP): — m

T_A1: — m T_F1: — m

Trim by stern is positive. Draft change at a point is proportional to its distance from LCF: ΔT(x) = ± t · x / L_pp.

Report: Trim Calculation

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Notes

Total trim (m): \( t = \dfrac{\mathrm{TM}}{\mathrm{MCT_{1cm}}} \times 0.01 \).

Distances from LCF: \( x_{AP} = L_{pp}/2 - LCF \), \( x_{FP} = L_{pp}/2 + LCF \) (LCF positive aft).

Draft changes: \( \Delta T_{A} = +t \cdot x_{AP}/L_{pp} \), \( \Delta T_{F} = -t \cdot x_{FP}/L_{pp} \) for trim-by-stern.