Squat / UKC Calculator

Calculate squat and under keel clearance at high water. Uses the confined (shallow) water formula — conservative for open water.

Least Charted Depth (m)

Height of Tide at HW (m)

Block Coefficient (Cb)

Transit Speed (knots)

Vessel Static Deep Draft (m)

Minimum Required UKC (m) (optional)

UKC at HW

--m

Water Depth at HW--

Max Static Draft--

Squat--

Squat formula (confined water): 2 × Cb × V² / 100 · UKC = Water depth at HW − Draft − Squat · Max Static Draft = Water depth at HW − Squat − Minimum UKC (if entered). In open water, actual squat will be less — this formula gives the maximum (conservative) estimate.