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Calculators for seafarers: deck and engine room

Free, without registration, and they work offline once the page is open. Every result shows how it was calculated.

Deck and navigation

ETA and passage time calculatorDistance and speed give the time on passage, the ETA and the distance per day.Speed and distance units: knots, km/h, nautical milesConvert knots, km/h, m/s and mph, and nautical miles, kilometres, cables and metres.Beaufort wind scale: wind speed, force and wave heightFind the Beaufort force from wind speed in knots, m/s or km/h, with the probable wave height in the open sea.Squat and under keel clearance calculatorHow much the ship sinks at speed in shallow water (Barrass formula), the clearance left and the highest safe speed.Tide height calculator (rule of twelfths)Height of tide at any time between low and high water, and when the tide reaches the height you need.

Engine room

Pt100 resistance table and calculatorConvert Pt100 and Pt1000 resistance to temperature and back (IEC 60751). Table from −50 to 400 °C.4–20 mA signal calculatorConvert loop current to pressure, temperature or level for any range, and back. Check a transmitter against the alarm monitor.Pressure unit converterBar, MPa, kPa, psi, kgf/cm², atm, mm Hg and metres of water — enter one, read all the others.Insulation resistance: correction to 40 °CCorrect a megger reading of a motor or generator winding to 40 °C and compare it with the IEEE 43 minimum.Fuel density at 15 °C and bunker quantityVolume correction factor (VCF, ASTM Table 54B), volume at 15 °C and mass in tonnes for fuel oil and gas oil.