Use this sailing calculation as a planning or educational cross-check for navigation, wind and current, rig loads, stability, anchoring, tides, visibility, performance, or recovery under explicitly stated conditions.

Heeling moment (ft·lb)

Heeling moment applied to the boat.

Displacement (lb)

Boat displacement.

Metacentric height (ft)

Metacentric height GM.

Estimate the steady heel angle from heelDeg = degrees(asin(min(1, heelingMomentFtLb / (displacementPounds * metacentricHeightFeet)))). The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Heel angle (deg)

Steady heel angle in degrees.

• Actual conditions change with vessel design and loading, sea state, wind, current, tide datum, weather, chart accuracy, equipment, crew, regulations, and safety margins. Simplified formulas do not replace seamanship, approved stability data, or current navigation information.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Cross-check official charts, tide and weather services, instrument data, vessel manuals, and collision regulations; maintain conservative margins and a safe alternative plan.

• Heel Target Guide

  Guide the upwind heel angle as eight tenths of the wind speed in degrees, clamped between five and thirty degrees.

• Vang Angle Calculator

  Compute the vang angle in degrees as atan of the mast attachment height over the boom attachment distance.

• Code Zero Wind Angle

  Estimate the true wind angle for a code zero using codeZeroTwaDeg = round(50 + apparentWindKt * 0.3), clamped to 40 through 70 degrees.