Ship Seakeeping Heave & Pitch Period Calculator

Calculate ship natural heave ($T_z$), pitch ($T_\theta$), and roll ($T_\phi$) oscillation periods, Doppler wave encounter frequency, and parametric resonance risk.

Ship Dimensions & Mass Inertia

Displacement Δ (tonnes):

Length L_BP (m):

Beam Molded B (m):

Waterplane Area A_WP (m²):

Transverse GM_T (m):

Longitudinal GM_L (m):

Operational Seaway Condition

Speed V (knots):

Wave Period T_0 (s):

Encounter Heading:

Natural Periods & Seakeeping Resonance

Encounter Period (T_e)

Natural Roll Period (T_ϕ)

Natural Heave T_z

Natural Pitch T_θ

Seakeeping & Parametric Roll Diagnosis

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Ship Seakeeping Heave & Pitch Period Calculator

Ship Dimensions & Mass Inertia

Operational Seaway Condition

Natural Periods & Seakeeping Resonance

Frequently Asked Questions