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 from bore, stroke, and cylinder count. Solve for bore or stroke with unit conversions.

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

Calculate horsepower from torque and RPM using the standard mechanical power formula in real time.

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 engine compression ratio to PSI pressure or reverse-calculate ratio from known compression pressure and atmospheric conditions.

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.