Travel & Automotive

Fuel Cost Calculator

Calculate total fuel cost and amount of fuel needed for any trip based on distance, mileage, and price.

Mileage Calculator

Calculate your vehicle fuel mileage in km/L, L/100km, or miles per gallon (mpg).

Tire Size Calculator

Calculate tire dimensions from tire code including section width, aspect ratio, sidewall height, and overall diameter. Compare two tires visually.

Engine Horsepower Calculator

Estimate engine horsepower using quarter-mile elapsed time and trap speed methods. Free online engine horsepower calculator with instant results.

Airplane Weight Shift Calculator

Calculate how shifting cargo, baggage, or passengers affects the center of gravity of an aircraft using the weight shift formula.

Crawl Ratio Calculator

Calculate crawl ratio using differential, transfer case, and transmission low gear ratios. Essential for off-road 4x4 gearing setup.

Dyno Correction Factor Calculator

Calculate SAE J607/J1349 dyno correction factor for naturally aspirated engines. Correct observed horsepower to standard atmospheric conditions.

Effective Gear Ratio Calculator

Calculate the effective gear ratio after changing tire size. Solve for effective ratio, old tire diameter, new tire diameter, and gear ratio with our online effective gear ratio calculator.

Engine Displacement Calculator

Calculate engine displacement in cc or cubic inches from bore, stroke, and cylinder count, or solve for bore or stroke easily. Free online tool, no signup.

ET Method Horsepower Calculator

Calculate the change in horsepower between before and after quarter-mile ET times using the empirical ET method formula.

Fuel Injector Size Calculator

Calculate the right fuel injector size for your engine build using the HP/16 rule of thumb with support for forced induction and E85 scaling.

Gas Mileage Calculator

Calculate your vehicle fuel economy in MPG, km/L, or L/100km and estimate trip fuel costs.

Gear Ratio Speed Calculator

Calculate vehicle speed from RPM, tire size, and gear ratio. Solve for speed, engine RPM, gear ratio, or tire radius using the v = (r × RPM) / (168 × G) drivetrain equation.

Power to Weight Ratio Calculator

Calculate power to weight ratio for vehicles and engines. Compute PWR in horsepower per ton or watts per kilogram with customizable inputs.

Suspension Spring Rate Calculator

Calculate coil spring rates for automotive suspension using the helical spring formula. Solve for spring rate, wire diameter, coil diameter, or active coils.

0-60 Quarter Mile Calculator

Estimate 0-60 mph acceleration time and quarter-mile elapsed time from horsepower and curb weight. Free online car performance calculator.

Flight Distance Calculator

Calculate great-circle air distance between cities or airports with flight time estimation, aircraft speed profiles, and route allowance.

Hiking Pace Calculator (Naismith's Rule)

Calculate your hiking pace using Naismith's Rule. Plan your hike with accurate time estimates accounting for distance, elevation gain, terrain difficulty, and pack weight. Free online hiking calculator.

ETA Calculator

Estimate the remaining duration and completion time for file transfers, downloads, or batch tasks with a real-time progress simulator.

AFR Calculator

Calculate the stoichiometric air-fuel ratio for common fuels including methane, propane, octane, hydrogen, and more with customizable fuel composition.

Torque to Horsepower Converter

Convert torque and RPM to horsepower instantly with this free online calculator. Enter your values and get accurate results in your browser, no signup needed.

0-60 Calculator

Estimate 0-60 mph acceleration time from engine power, vehicle weight, drivetrain, tires, and road conditions.

Boat Speed Calculator

Calculate your boat's top speed based on horsepower, displacement, and boat type using Crouch's formula. Supports multiple boat types from cruisers to racing hydroplanes.

Boost Horsepower Calculator

Calculate how much horsepower a supercharger adds to your engine based on boost pressure and current naturally aspirated power output.

Brake Specific Fuel Consumption

Calculate brake specific fuel consumption and engine efficiency using our online BSFC calculator. Supports metric and imperial units.

Carpooling Calculator

Calculate your carpool trip costs, divide expenses among passengers, and see your CO2 savings with our free carpooling calculator.

Commute Calculator

Calculate your monthly commute cost including fuel, parking, tolls, and wear and tear. Compare driving with carpooling and public transportation.

Compression Ratio to PSI Calculator

Convert an engine's compression ratio to PSI or reverse-calculate ratio from measured compression pressure and atmospheric conditions. Free and no signup.

Cost Per Mile Calculator

Calculate the cost per mile for your trips, commute, and travel expenses instantly. Free online cost per mile calculator for budgeting travel costs.

Crosswind Calculator

Calculate crosswind, headwind, and tailwind components for aviation and driving. Enter runway heading, wind direction, and wind speed to get wind component speeds.

Cycle Time Calculator

Calculate cycle time for manufacturing and production processes. Find the average time to produce one item from net production time and total units.

Drive Time

Calculate your drive time, arrival time, and trip fuel costs. Enter distance, speed, breaks, and departure time to plan your road trip with cost per person.

Engine Hours to Miles Converter

Convert engine hours to miles and vice versa. Estimate your vehicle's engine runtime vs distance with our free engine hours to miles converter.

EUI Calculator

Calculate Energy Use Intensity (EUI) to measure your building's energy efficiency by dividing annual energy consumption by total floor area.

GVWR Calculator

Calculate your vehicle's gross vehicle weight rating (GVWR) using tare weight and rated payload. Know how much weight your vehicle can safely carry.

Miles Per Year Calculator

Estimate annual driving distance from daily, weekly, or monthly mileage with fuel cost and consumption options.

Miles to Dollars Calculator

Convert airline miles to dollar value and compare booking with miles vs cash for any airline. Free online miles to dollars converter.

MPG Calculator

Calculate your vehicle fuel efficiency in miles per gallon (MPG) with our free online MPG calculator. Estimate fuel consumption, trip cost, and gas usage instantly.

Nautical Mile Calculator

Convert between nautical miles, miles, and kilometers with our free online nautical mile calculator. Calculate distance, speed, and time for marine and aviation navigation.

RPM Calculator

Calculate RPM, vehicle speed, transmission ratio, or tire diameter. Enter any three values to find the fourth. Convert engine RPM to MPH with our free online RPM calculator.

Speedometer Gear

Calculate the correct driven gear teeth count for your vehicle speedometer after axle ratio, transmission, or tire size changes.

Tesla Charging Cost Calculator

Calculate the cost to charge your Tesla or EV based on battery capacity, electricity price, and driving distance.

Traffic Density Calculator

Calculate traffic flow, density, average speed, and headway between vehicles. Analyze road congestion and traffic patterns with instant browser-side calculations.

Turbo Size Calculator

Calculate the ideal turbocharger size for your engine based on displacement, RPM, boost pressure, and desired power output.

Wheel Horsepower

Calculate wheel horsepower (WHP) from engine horsepower (BHP) and vice versa using drivetrain loss percentage estimates.

Wheel Offset

Compare current and new wheel setups to calculate inner clearance change and outer poke shift.

Winch Size

Calculate the recommended winch capacity for vehicle recovery based on weight, slope angle, and surface conditions.

Windsock Calculator

Convert windsock angle and extended segments to wind speed in knots, mph, km/h, or m/s.

Lease Mileage Calculator

Calculate lease mileage allowance, current pace vs allowed limit, estimated excess mileage penalty fees, and daily/monthly mileage budgets.

Hot Car Calculator

Estimate car interior and child body temperature over time from outside temperature, cloud cover, and window position.

Slope Percentage Calculator

Convert slope percentage, rise over run, angle in degrees, and grade for roads, ramps, and math problems with instant bidirectional calculations.

Antipode Calculator

Find the antipode (diametrically opposite point) on Earth from any latitude and longitude coordinates.

Azimuth Calculator

Calculate azimuth bearing and great-circle distance between two latitude/longitude points using the Haversine formula.

Drone Flight Time Calculator

Estimate drone flight time from battery capacity, discharge limit, voltage, and all-up weight with average amp draw calculations.

Drone Motor Calculator

Calculate required motor thrust from drone weight, battery, equipment, thrust-to-weight ratio, and motor count.

Latitude Longitude Distance

Calculate great-circle distance between two latitude and longitude points in km and miles.

Vertical Exaggeration Calculator

Calculate vertical exaggeration factor for topographic profiles and cross-sections from horizontal and vertical map scales.

Bank Angle Calculator

Calculate aircraft or vehicle bank angle from speed, turn radius, and centripetal acceleration for coordinated turns.

BMEP Calculator

Calculate brake mean effective pressure, engine torque, and power from displacement, RPM, and torque using BMEP formulas.

Carburetor CFM Calculator

Calculate required carburetor CFM for naturally aspirated engines based on displacement, RPM, and volumetric efficiency.

Exhaust Diameter Calculator

Calculate optimal exhaust pipe diameter from engine displacement, RPM, and horsepower.

Gear Ratio Calculator

Calculate gear ratio from driver and driven teeth, output speed, and output torque using GR = N_driven/N_driver.

Gear Ratio RPM Calculator

Calculate output RPM from input RPM and gear ratio, or find gear ratio from shaft speeds. This free browser tool gives instant results with no signup needed.

Ground Speed Calculator

Calculate ground speed, wind correction angle, and heading from true airspeed, wind speed, and wind direction using the aviation vector triangle.

Piston Speed Calculator

Calculate mean piston speed from engine RPM and stroke length with unit conversion and step-by-step mechanical formulas.

Prop Pitch Calculator

Calculate boat propeller pitch from RPM, gear ratio, and boat speed with step-by-step nautical formulas.

Prop Slip Calculator

Calculate propeller slip percentage from theoretical speed, actual boat speed, and RPM with step-by-step marine formulas.

Rolling Resistance Calculator

Calculate rolling resistance force from rolling coefficient, mass, and gravity

Stopping Distance Calculator

Calculate vehicle stopping distance from speed, reaction time, and deceleration with thinking and braking distance breakdown.

True Airspeed

Convert indicated airspeed to true airspeed using altitude and ISA air density ratios.

True Airspeed Calculator

Convert indicated airspeed to true airspeed using altitude and ISA air density ratios.

Wind Correction Angle Calculator

Calculate aircraft wind correction angle and ground speed from true airspeed, wind speed, and wind direction.

Wing Loading Calculator

Calculate aircraft wing loading from weight and wing area in lb/ft² and kg/m².

E-Bike Range

Estimate electric bike range from battery capacity, motor efficiency, rider weight, terrain, and assist level.

Hull Speed Calculator

Calculate theoretical hull speed of displacement boats from waterline length.

Jet Lag Calculator

Estimate jet lag severity and recovery time from your origin and destination timezones, with a day by day sleep adjustment schedule and practical recovery tips.

Travel Cost Calculator

Estimate fuel, tolls, and total trip cost from distance, MPG, gas price, and passengers.

Stopping Sight Distance Calculator

Estimate stopping sight distance from speed, reaction time, and deceleration for road design.

Road Grade Calculator

Calculate road grade percent from rise and run or elevation change for civil engineering design.