Transport & Marine calculators
Choose a task below. Check each calculator’s assumptions and units before using its result.
Anchor Rode Calculator - Chain Scope & Water Depth
Determine safe anchor rode length, catenary chain requirements, and swing radius for peaceful and storm anchoring.
Boat Fuel Range Calculator - GPH, Gallons & Reserve
Determine safe operating cruising range, fuel economy, and endurance applying the Rule of Thirds.
Boat Hull Speed & Displacement Power (Knots & Horsepower) Calculator | AnythingOnline
Free boat hull speed calculator. Compute displacement hull speed (knots), Froude number, required auxiliary engine horsepower, and speed-to-length ratio.
Boat Planing Minimum Horsepower & Speed (Crouch Formula) Calculator | AnythingOnline
Free boat planing horsepower calculator. Compute minimum outboard horsepower to achieve plane, top speed via Crouch’s formula, and speed-to-weight ratios for monohulls and RIBs.
Boat Propeller Slip Calculator - Pitch & True Boat Speed
Determine propeller slip percentage, theoretical top speed, and hull efficiency from GPS speed and engine RPM.
Brake Stopping Distance Calculator - Speed & Braking
Calculate total emergency stopping distance in feet and meters factoring in vehicle speed, driver perception reaction time, and road friction.
Car Alternator Amperage & Electrical Load Budget Calculator | AnythingOnline
Free automotive alternator calculator. Calculate total electrical load in Amps, continuous vs peak accessory draw, required high-output alternator rating, and idle RPM capacity.
Carburetor CFM Calculator - Engine Displacement & RPM
Calculate required carburetor cubic-feet-per-minute (CFM) airflow for street cruisers, hot rods, and drag race engines to avoid over-carburetion.
Compression Ratio Calculator - Engine Bore & Stroke
Calculate static engine compression ratio, swept cylinder volume, and total displacement in cubic inches (CID) and cubic centimeters (cc).
Course to Steer & Tidal Vector Navigation Calculator | AnythingOnline
Free marine course to steer calculator. Solve the vector triangle for ocean current set, drift, and leeway to determine CTS and Speed Over Ground.
Crosswind & Headwind Runway Component Calculator | AnythingOnline
Free aviation crosswind calculator. Calculate headwind, tailwind, and crosswind runway components from wind direction and speed for safe pilot operations.
Distance to Horizon Calculator - Observer & Object Height
Calculate geometric and atmospheric refraction line-of-sight horizon distance from observer and target elevation.
Driveshaft Critical Speed Calculator - Max Safe RPM
Determine the catastrophic resonant bending frequency (critical RPM) and safe operating road speeds for steel, aluminum, and carbon fiber drivelines.
Dyno Correction Factor Calculator - SAE J1349 & STP
Normalize measured dynamometer wheel horsepower and torque across varying ambient temperatures, barometric pressures, and relative humidities.
Engine Compression Ratio Calculator - CC & Displacement
Determine static compression ratio (SCR), individual cylinder swept CC, combustion chamber volumes, deck heights, and total engine displacement.
EV Charging Time, Range & Charging Speed (kW to Hours) Calculator | AnythingOnline
Free EV charging time calculator. Compute charging duration from charger kW, added miles of range, charging speed (mph), and cost with DC fast charging taper.
Free Tire Size & Wheel Offset Calculator
Compare OEM vs new wheel fitment: calculate inner strut clearance change, outer fender poke, speedometer calibration error, and rolling diameter.
Fuel Injector Calculator - Horsepower & Flow Sizing
Determine the exact injector flow rate in pounds-per-hour (lbs/hr) and cc/min required to support your target engine horsepower safely.
Fuel Injector Sizing Calculator - HP & Flow Rate
Determine exact fuel injector flow requirements in lb/hr and cc/min based on target horsepower, fuel type (Gasoline, E85, Methanol), and maximum duty cycle.
Gear Ratio, Speed & Engine RPM Calculator | AnythingOnline
Free gear ratio and vehicle speed calculator. Calculate MPH, km/h, and engine RPM from transmission gears, axle ratios, and tire dimensions.
Marine Battery Bank & Inverter Wire Size (ABYC 3% Drop) Calculator | AnythingOnline
Free marine battery bank and inverter wire size calculator. Compute 12V/24V/48V battery bank capacity (Ah), daily Wh energy budgets, and ABYC 3% voltage drop AWG wire gauge.
Nautical Distance ETA Calculator - Voyage Time & Bunker
Estimate maritime voyage transit time, weather sea margin speed loss, arrival times, and total bunker fuel burned at sea and during port turnaround.
Propeller Slip Calculator - Pitch RPM & Marine Speed
Determine apparent propeller slip percentage, theoretical engine distance, observed speed through water, and driveline efficiency from shaft RPM and pitch.
Quarter Mile ET Calculator - Trap Speed & Horsepower
Estimate 1/4-mile elapsed times, finish-line trap speeds in MPH, and 1/8-mile split benchmarks based on race weight and flywheel horsepower.
Rule of Twelfths Calculator - Tide Height by Hour
Estimate intermediate water depth and hourly vertical rise or fall between high and low tide.
Ship Draft Displacement Calculator - TPC & Deadweight
Compute total displacement tonnage, deadweight cargo capacity (DWT), Tons Per Centimeter immersion (TPC), and Fresh Water Allowance (FWA) from draft readings.
Ship Fuel Consumption Calculator - Steaming Speed & Knots
Determine bunker fuel savings, daily metric tons consumed, voyage duration, and financial payoffs from slow steaming using the Admiralty propulsion law.
Ship Squat Calculator - Shallow Water Under Keel Clearance
Determine dynamic squat sinkage in meters and feet, dynamic trim direction, and net Under-Keel Clearance (UKC) to prevent vessel grounding in shallow fairways.
Tire Size Calculator - Diameter, Speedo Error & Width
Compare two tire dimensions side-by-side to calculate differences in overall diameter, sidewall height, revs per mile, and speedometer error.
Tire Size Gear Ratio & Re-Gearing Calculator | AnythingOnline
Free tire size gear ratio calculator. Calculate effective axle ratio for larger tires, determine required re-gearing ratio, and compute speedometer error.
Trailer Tongue Weight Percentage & Cargo Balance Calculator | AnythingOnline
Free trailer tongue weight calculator. Compute tongue weight percentage, prevent trailer sway, check hitch ratings, and calculate cargo repositioning distance.
Truck Towing Capacity, Payload & GCWR Safety Limit Calculator | AnythingOnline
Free towing capacity and payload calculator. Check GVWR, GCWR, available payload vs tongue weight, passengers, and gear before towing a trailer.
True Wind Speed & Angle (TWS / TWA) Vector Calculator | AnythingOnline
Free True Wind Calculator. Convert apparent wind speed (AWS) and apparent wind angle (AWA) into True Wind Speed (TWS), True Wind Angle (TWA), and True Wind Direction (TWD).
Turbo Intercooler Efficiency, IAT Drop & Air Density Calculator | AnythingOnline
Free turbo intercooler efficiency calculator. Compute compressor discharge temperature from boost PSI, intercooler thermal efficiency, manifold IAT drop, and air density ratio.
Turbocharger Compressor Sizing & Airflow Pressure Ratio Calculator | AnythingOnline
Free turbocharger compressor map calculator. Compute mass airflow (lbs/min), compressor pressure ratio (Pr), intake manifold density, and boost sizing.
Weight Distribution Hitch & FALR Load Transfer Calculator | AnythingOnline
Free weight distribution hitch calculator. Calculate front and rear axle load transfer, spring bar torque, and Front Axle Load Restoration (FALR) for safe towing.