Calculators
Planning tools for american cars & garage life, with visible assumptions and units.
Estimate the current drawn by an automotive electrical load from its power and operating voltage using the basic DC relationship amps = watts ÷ volts. Enter the load's rated power and the voltage at which it operates. This estimate does not account for startup surges, wiring losses, or manufacturer-specific requirements.
Estimate the ideal charging time in hours from battery capacity, current state of charge, charger output, and an assumed charging efficiency. This arithmetic estimate does not account for a charger's changing current, battery condition, or temperature.
Estimate the total cost of replacing a car battery from the battery price, any additional parts, and labor. Enter amounts in one currency throughout. This is a user-supplied estimate and excludes taxes or fees unless you include them.
Estimate the fuel cost of a trip using distance in US miles, fuel economy in miles per US gallon (MPG), and fuel price per US gallon. The estimate assumes the entered fuel economy applies throughout the trip.
Estimate a yearly maintenance budget from your planned annual driving, routine service costs, tire spending, and repair reserve. This is a simple planning worksheet based on the amounts you enter, not a quote or prediction of actual repair costs.
Calculate the concentrate and water needed for a car wash mixture from your product’s stated dilution ratio and the total solution volume you want to prepare.
Estimate the product cost for one vehicle wash from the product price, container size, amount used per wash, and number of equivalent products used. The amount used per wash must not exceed the container size.
Estimate total engine displacement in cubic centimeters from cylinder bore, stroke, and cylinder count.
Estimate fuel economy from the distance traveled and fuel used. The result is distance per unit of fuel, using the units you enter.
Estimate the floor area of a rectangular garage from its interior length and width. Choose feet or meters for the measurements, and the result is shown in square feet.
Estimate the average load per shelf from the total weight of items and the number of shelves sharing that weight. This is a simple arithmetic planning estimate; it does not determine whether a shelf or its supports are safe for that load.
Estimate the total storage volume of identical rectangular bins in cubic feet. This is a volume estimate, not a shelf load or structural safety rating.
Calculate the overall gear reduction from the number of teeth on a driven gear and its driving gear. The result is the driven gear's rotational speed ratio relative to the driving gear, assuming direct engagement and no additional gearing.
Convert a distance in miles to kilometers using the standard factor of 1 mile = 1.609344 kilometers.
Estimate the fuel cost of a road trip from its distance, your vehicle's fuel efficiency, and the price per gallon.
Calculate a tire’s circumference in meters from its diameter using the circumference formula. This assumes a circular tire and uses the supplied diameter as a direct measurement.
Estimate a tire's overall diameter from its section width, aspect ratio, and wheel diameter. Enter measurements in millimeters and inches as labeled.
Estimate tire revolutions per mile from tire size using the nominal sidewall-height geometry. Enter the tire section width, aspect ratio, and wheel diameter. The estimate treats the tire as an undeformed circle and does not account for load, inflation pressure, tread wear, or manufacturer-measured rolling circumference.
Estimate a vehicle's total storage cost from a monthly storage rate, the number of months stored, a monthly climate-control surcharge, and a one-time intake fee.
Compare two wheel offsets to see how far the new wheel's mounting position shifts inward or outward relative to the current wheel. Positive results mean the new wheel moves outward; negative results mean it moves inward.