Marine Engineering & Buoyancy Calculators
Verify ship displacement tonnages, estimate theoretical boat speeds and propeller slip, evaluate hull speeds (planing vs displacement), calculate fuel burn rates, and determine line breaking strengths.
Hull Speed & Power
Estimate maximum displacement hull speeds (LWL formula) or calculate planing hull speeds using Crouch's classic marine formula.
Hull Hullform Options
Engineering Report
Real-time CalculationsDisplacement hulls are limited by the wavelength of their own bow wave. When the bow wave wavelength matches the Load Waterline Length (LWL), the boat sits in a trough, requiring exponential horsepower to climb over this wave (the bow wave speed barrier).
Recommended minimum auxiliary power for a 8.04 ton vessel: 33 HP (based on 4 HP/ton).
Quick Formulas Summary
Explore Additional Utilities
Soil Permeability Converter
Convert coefficient of permeability (hydraulic conductivity) between cm/s, m/day, ft/day, and m/s with soil type drainage classifications.
Solar Panel Output & Yield Calculator
Calculate daily and annual electricity generation (kWh) based on solar panel capacity (kWp), peak sun hours, and system efficiency losses.
Crown position ↔ function — hand setting vs winding
Map out the mechanical state and winding functions of crowns at positions 0, 1, and 2, including quickset dates and hacking.
Telescope Magnification Calculator
Calculate telescope magnification, exit pupil, and resolving limit from focal lengths and aperture.
Wind Chill Calculator
Determine the feels-like wind chill index from ambient air temperature and wind speed.
Yarn Weight Converter
Convert yarn sizes across WPI (Wraps Per Inch), ply, and standard weight categories.
Layer height ↔ print time estimator
Estimate 3D print duration changes and total layer counts when switching layer heights and print speeds.
Sample size calculator — confidence level ↔ margin of error
Determine required sample sizes for research surveys or experiments based on population size, confidence levels, and target margin of error.
Equatorial Coordinates Converter
Convert Right Ascension (RA) and Declination (Dec) to Hour Angle and Alt-Azimuth coordinates.
AWG Cable Sizer
Convert American Wire Gauge (AWG) sizes to metric dimensions, and estimate current carrying capacity.
IV Drip Rate (Drops/min ↔ mL/hour)
Convert IV flow rates between mL/hour and drops/minute (gtt/min) for any drop factor, with real-time dripping rate animation.
Current Speed Converter
Convert tidal, ocean, and river current speeds between knots, meters per second (m/s), and kilometers per hour (km/h).
Soil Plasticity Index Calculator
Calculate Plasticity Index (PI) from Liquid Limit (LL) and Plastic Limit (PL), and interpret soil state using the Atterberg limits chart.
Watch beat rate — BPH ↔ Hz ↔ vibrations per hour
Convert mechanical watch balance wheel frequencies between Beats Per Hour (BPH), Vibrations Per Hour, and Hertz (Hz).
True wind ↔ apparent wind
Calculate apparent wind speed and angle from true wind speed, sailing angle, and boat speed (or vice versa).
Hyperfocal Distance Calculator
Calculate hyperfocal distance, near sharp limit, and depth of field range starting point for any focal length, aperture, and sensor format.
Sidereal Time Converter
Convert between standard Solar Time and Sidereal Time based on your longitude.
Servo angle ↔ PWM pulse width
Convert between servo rotation angle in degrees and standard PWM pulse width in microseconds, with continuous rotation presets.
dBm to Watts/Volts
Convert RF power levels between dBm, milliwatts, watts, and RMS voltage across 50/75 ohm impedance.
Board feet ↔ cubic meters ↔ cubic feet — lumber volume
Convert lumber volume measurements between Board Feet, Cubic Feet, and Cubic Meters.