automotive Calculators
Last updated: May 2026
Fuel Economy Calculator
Calculate your vehicle's fuel economy in miles per gallon (MPG) by dividing the distance you drove by the fuel you consumed.
Auto Loan Payment Calculator
Calculate the monthly payment on an auto loan given the loan amount, annual interest rate, and term in months.
Tire Pressure Calculator
Convert tire pressure from PSI (pounds per square inch) to bar — the unit most non-US tire-pressure gauges and vehicle door-jamb stickers use in Europe and most of the world outside the US.
Engine Displacement Calculator
Calculate an engine's total displacement in cubic centimeters (cc) from the bore diameter, stroke length, and number of cylinders.
Horsepower from Torque Calculator
Calculate horsepower from torque (in lb-ft) and engine RPM using the classic HP = (torque × RPM) / 5252 formula.
Quarter Mile Time Calculator
Estimate how fast your car will run the quarter mile based on its power-to-weight ratio.
Gear Ratio Calculator
Calculate the gear ratio between two meshing gears using their tooth counts.
Braking Distance Calculator
Calculate how far your vehicle will travel before stopping based on speed and road surface friction.
Wheel Offset Calculator
Calculate wheel offset in millimeters from a wheel's width and backspacing measurement.
Compression Ratio Calculator
Calculate your engine's compression ratio from bore, stroke, and combustion chamber volume.
Speedometer Error Calculator
Find out how much your speedometer reads incorrectly after changing tire sizes.
Oil Change Interval Calculator
Quickly find how many miles remain until your next oil change is due.
Trip Fuel Cost Calculator
Estimate the total fuel cost for any road trip by entering your trip distance, vehicle's fuel economy, and local gas price.
Engine CFM Calculator
Calculate the carburetor or throttle body airflow requirement (in CFM) for an engine based on displacement and maximum RPM.
Tire Size Converter
Convert a metric tire size (width, aspect ratio, and wheel diameter) into overall tire diameter in inches.
Vehicle Depreciation Calculator
Estimate how much your car is worth after several years of ownership using a fixed annual depreciation rate.
RPM to Speed Calculator
Convert engine RPM into real vehicle speed in miles per hour using tire size and final drive ratio.
Car Battery Capacity Calculator
Find out how many hours your car battery can power an electrical load before draining.
Turbo Boost Pressure Calculator
Estimate the horsepower gain from adding turbo boost pressure to your engine.
Trailer Tongue Weight Calculator
Calculate the tongue weight your trailer places on your hitch from its total loaded weight.
Car Loan Payment Calculator
Calculate your monthly car loan payment from the amount financed, interest rate, and term.
Vehicle Depreciation Calculator
Estimate your vehicle's current market value by factoring in age, mileage, vehicle type, and condition.
Trip Fuel Cost Calculator
Estimate gas costs for a single trip or recurring commute based on distance, fuel efficiency, and gas prices.
Lease vs Buy Calculator
Compare the true out-of-pocket cost of leasing versus financing a vehicle purchase over the same period.
Auto Insurance Cost Estimator
Estimate your annual auto insurance premium using your vehicle's value, driver age, driving record, coverage level, and deductible.
Vehicle Stopping Distance Calculator
Calculate total vehicle stopping distance given your speed, reaction time, road surface, brake condition, and vehicle weight.
Monthly Car Payment Calculator
Computes your exact monthly auto loan payment from vehicle price, down payment, sales tax, interest rate, and loan term.
Tire Size & Speedometer Calculator
Find out exactly how swapping to a different tire size shifts your speedometer reading and changes overall tire diameter.
Car Affordability Calculator
Calculate the maximum car price you can afford based on your monthly income, down payment, loan rate, and term.
Fuel Cost & Savings Calculator
Calculate your annual fuel cost based on miles driven, MPG, and gas price.
Car Lease vs Buy Calculator
Compare the true out-of-pocket cost of leasing versus buying a car over the same time period.
Engine Performance Calculator
Estimate engine horsepower from torque and RPM, with adjustments for displacement and aspiration type.
Fuel Cost Per Kilometre Calculator
Works out how much fuel costs you for every kilometre driven, from the fuel price and your vehicle’s consumption in litres per 100 km.
Fuel Cost Per Trip Calculator (with Tolls & Carpool Split)
Work out the true monthly fuel cost of a recurring trip or commute, including tolls, how often you drive it, and how the bill splits between carpool passengers.
EV vs Gas Total Cost of Ownership Calculator
Compare the multi-year running cost of an electric car against a gasoline car, factoring in fuel vs electricity, maintenance savings, and the EV's higher purchase price.
Car Lease vs Loan Cost Comparison Calculator
Compare the net cost of leasing a car against financing it with a loan over the same term, accounting for the loan's amortized payments and the car's resale (residual) value.
EV Charging Cost & Time Calculator
Estimate the total cost of charging your EV from one state of charge to another, including charging losses and any time-based (per-minute or idle) session fees that depend on charger speed.
Multi-Leg Road Trip Cost Calculator
Budget a multi-stop road trip by adding up to three driving legs, then layering fuel, lodging, and daily food costs into a single total trip estimate.
Tire Size Comparison & Speedometer Error Calculator
Compare two tire sizes in standard width/aspect/rim notation to see the change in overall diameter and the resulting speedometer error when you switch.