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
Feed ration — horse weight ↔ work level → kg hay + grain
Calculate daily dry matter intake, forage requirements, and grain rations based on horse weight and workload.
URL Slug Generator
Generate clean, hyphenated, SEO-friendly slugs from any string with custom separators.
Pipe thread standard — NPT ↔ BSP ↔ metric
Compare dimensions, angles, thread pitches, and sealing mechanics of NPT, BSPP, BSPT, and Metric thread systems.
Angular Scales & Rotations
Convert degrees, radians, and gradians for geometric or angular rotations.
NPK Fertilizer Blend Designer
Calculate exact commercial fertilizer weights (Nitrogen, Phosphate, Potash) required to hit crop nutrient targets.
Heat Index Feels-Like
Assess felt air heat indexes using ambient temperature and relative humidity thresholds.
Dye concentration — leather area ↔ product needed
Estimate leather dye volume needed based on total surface area, coat layers, and color reduction ratios.
Base64 ↔ hex ↔ binary — encoding format converter
Convert raw text strings or bytes bidirectionally between Base64, Hexadecimal, Binary, and standard ASCII formats.
Rivet size — leather thickness ↔ post length needed
Calculate the correct rivet post length based on your total leather material stack thickness and hardware style.
Air changes per hour — room volume ↔ fan capacity
Evaluate active ventilation air changes per hour (ACH) based on blower CFM capacity and physical room volume.
Twist per inch (TPI) — spinning wheel flyer ratio ↔ speed
Calculate twists per inch (TPI) based on flyer ratio, treadles per minute, and fiber intake rate.
ISO Week Number ↔ Calendar Date
Calculate ISO 8601 week numbers, week dates, and determine start/end weekdays of any given week year.
Water temperature ↔ dissolved oxygen capacity
Calculate the maximum theoretical dissolved oxygen (DO) saturation limits in water reservoirs across varying water temperatures.
Light intensity — PPFD ↔ lux ↔ watts per sq meter
Convert between Photosynthetic Photon Flux Density (PPFD/PAR), illuminance (Lux/Foot-candles), and grow light wattage requirements.
Hood size — beak width ↔ head circumference
Determine the optimal hood size, pattern dimensions, and fitting index from a bird’s beak width and cranial circumference.
Responsive Font Units Converter
Compute points, pixels, em, rem web font guidelines, and equivalent font sizes.
Lure weight ↔ bird size — training tool sizing
Determine the correct weight and aerodynamics of a training lure based on the bird’s species, sex, and weight.
Drawing out ratio — starting thickness ↔ final length
Estimate expanded length when forging down the cross-section thickness of hot steel bars under conservation of volume.
Standing timber volume — DBH + height → cubic meters
Calculate merchantable standing timber volume in cubic meters or board feet using Doyle, Scribner, or International rules.
Audio File Size & Sample Rate
Compute uncompressed audio files size based on sample rate, bit depth, and duration.