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 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.
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).
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.
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.
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.