52 tools
Automotive
Fuel consumption, trip cost, speed and distance, engine figures and tyre or wheel calculations.
Tools in this category
- AutomotiveFuel Consumption CalculatorReal consumption from a tankful, in L/100 km, km/L and both kinds of mpg.
- AutomotiveTrip Cost CalculatorWhat a journey really costs: fuel, tolls and parking, with the total split per person and per kilometre.
- AutomotiveEV Charging Cost CalculatorCost of a charge, energy drawn from the socket, range added and cost per kilometre.
- AutomotiveFuel Cost Comparison CalculatorCompare two cars on what they cost per 100 km, whatever they run on, and see how far you drive before a higher purchase price pays for itself.
- AutomotiveTyre Size CalculatorOverall diameter, rolling circumference and sidewall height from a tyre code.
- AutomotiveEV Range CalculatorHow far an electric car actually goes once you take off the unusable part of the battery, the reserve you keep and the cold or the motorway.
- AutomotiveBraking Distance CalculatorStopping distance split into reaction distance and braking distance, plus the total time.
- AutomotiveFuel Savings CalculatorYearly fuel and money saved by switching to a car with lower consumption.
- AutomotiveCar Lease CalculatorWork a lease payment out from the price, the residual value and the rate, and see how much of it is the car losing value and how much is interest.
- AutomotiveAnnual Car Cost CalculatorTotal yearly cost of running a car, per month and per kilometre.
- AutomotiveCarpool Cost CalculatorFair share per passenger for fuel and tolls on a shared journey.
- AutomotiveTwo-Stroke Fuel Mix Calculator (Petrol and Oil Ratio)Millilitres of two-stroke oil to add to a given amount of petrol for a 50:1, 40:1 or any other ratio, and the ratio you really have if you already added the oil.
- AutomotiveMileage Allowance CalculatorYearly mileage reimbursement, what the fuel alone costs, and the margin between the two.
- AutomotivePower-to-Weight Ratio CalculatorPower per tonne and kilograms per horsepower, including passengers and luggage.
- AutomotiveEngine Displacement CalculatorEngine capacity in cubic centimetres and litres from bore, stroke and cylinder count.
- AutomotiveCar CO₂ Emissions Calculator (L/100 km to g/km and Yearly CO₂)Grams of CO₂ per kilometre from fuel consumption, the CO₂ of a year's driving, and the consumption that a CO₂ figure on a car label implies.
- AutomotiveGear Speed CalculatorRoad speed at a given engine speed in a chosen gear, plus the wheel speed and overall ratio.
- AutomotiveCompression Ratio CalculatorStatic compression ratio from bore, stroke and combustion chamber volume, with the swept volume.
- AutomotiveSpeedometer Error from Tyre SizeHow much a change of tyre size shifts the indicated speed and the odometer reading.
- AutomotiveTyre Pressure Temperature CalculatorHow tyre pressure changes with temperature, in bar, psi and as a percentage.
- AutomotiveTrailer Tongue Weight CalculatorDownload on the towball for a loaded trailer, against the limit of your towbar.
- AutomotiveDyno Correction Factor Calculator (DIN 70020 and SAE J1349)The factor that converts power measured on a dyno on the day to standard atmospheric conditions, by DIN 70020 or SAE J1349, and the corrected power.
- AutomotiveEngine Airflow Calculator (CFM for Carburettor, Throttle Body or Turbo Sizing)How much air a four-stroke engine swallows at a given speed, in CFM, litres per second and grams per second, from its displacement, volumetric efficiency and boost.
- AutomotiveWheel Offset and Backspacing CalculatorBackspacing from wheel width and ET offset, and the change when swapping to a different offset.
- AutomotiveAir-Fuel Ratio to Lambda Converter (Petrol, Diesel, E85, Ethanol, LPG)Convert an air-fuel ratio to lambda (λ) and back for the fuel you burn, with the equivalence ratio and how far the mixture is from ideal.
- AutomotiveAltitude Power Loss Calculator (Naturally Aspirated Engines)How much power a naturally aspirated engine loses at altitude and in warm air, from the standard atmosphere and your air temperature.
- AutomotiveApparent Wind Calculator (Sailing and Cycling)The wind you actually feel on a moving boat or bike — its speed and the angle it comes from — given the true wind and your own speed.
- AutomotiveBraking Weight Transfer Calculator (Axle Loads When Braking, Stoppie and Wheelie Limits)Load on the front and rear axles under hard braking, from the weight, wheelbase, height of the centre of gravity and how hard you brake — plus the point where the rear wheels would lift.
- AutomotiveSpeeding Time Saved Calculator (How Much Time Does Driving Faster Save?)Minutes saved on a trip by driving at a higher speed, and the average speed you would need to arrive a given number of minutes earlier.
- AutomotiveWheel Torque Calculator (Gearing, Tractive Force and Road Speed)Torque at the wheels, the pushing force at the road and the road speed at a given engine speed, from the engine torque, the gear and final-drive ratios and the tyre radius.
- AutomotiveWind Correction Angle Calculator (Wind Triangle: Heading and Ground Speed)The heading to fly or steer to hold a desired course in a crosswind, the drift correction angle and the resulting ground speed.
- AutomotiveAircraft Weight and Balance Calculator (Centre of Gravity of a Light Aircraft)Total weight and centre of gravity of a light aircraft loaded with people, baggage and fuel, checked against your weight and CG limits.
- AutomotiveAnchor Scope Calculator (How Much Chain and Rope to Let Out)Length of anchor rode to let out for a given depth, tide and scope ratio, with the horizontal reach of the rode and the radius of the circle your boat can swing through.
- AutomotiveBank Angle, Load Factor and Stall Speed in a Turn CalculatorLoad factor, raised stall speed, turn radius and rate of turn for an aircraft in a banked level turn, plus the bank angle that gives a standard-rate turn.
- AutomotiveBike Chain Wear Calculator (Chain Stretch Percentage)How worn a bicycle chain is, from the measured length of a number of links, with the length at which common wear limits are reached.
- AutomotiveCPA and TCPA Calculator (Closest Point of Approach Between Two Vessels)How close another vessel will pass and how many minutes until then, from its bearing, range, course and speed and your own — the numbers a radar or AIS shows.
- AutomotiveEthanol Fuel Blend Calculator (E10 + E85 Mix, Flex-Fuel)Ethanol content of a tank after topping up with a different blend, and how much E85 (or E10) to add to land on the percentage you want.
- AutomotiveGear Shift RPM Drop Calculator (Where the Revs Land After an Upshift)Engine speed just after you change up (or down) a gear, how much the revs fall, and the road speed at which it happens, from the two gear ratios.
- AutomotiveGlide Distance Calculator (How Far Can I Glide After an Engine Failure?)How far an aircraft, glider or paraglider can glide from a given height, from its glide ratio, with the effect of headwind or tailwind and the time in the air.
- AutomotiveHydroplaning Speed Calculator (Aquaplaning Speed from Tyre Pressure)Rough speed at which tyres can start to ride up on standing water, from the tyre pressure, with the margin to the speed you drive at.
- AutomotiveQuarter-Mile Horsepower CalculatorEstimated engine power of a car from a quarter-mile run, using both the trap speed and the elapsed time, as drag racers have done for decades.
- AutomotiveRoad Trip Planner Calculator (Days, Breaks and Fuel Stops)How many days a road trip takes, how many breaks and fuel stops it needs, and the total time on the road, from the distance, speed and how long you want to drive each day.
- AutomotiveSuspension Sag Calculator (Mountain Bike and Motorcycle Fork and Shock Setup)How much a fork or shock compresses under your weight, as millimetres and as a share of its travel, compared with the sag you are aiming for.
- AutomotiveTop of Descent Calculator (Where to Start Descending, Rate of Descent)How far from your destination to start descending, and the rate of descent you need, for a given altitude to lose, path angle and ground speed.
- AutomotiveTrue Airspeed Calculator (TAS from Indicated or Calibrated Airspeed)True airspeed from calibrated airspeed, pressure altitude and outside air temperature — how fast the aircraft really moves through the air.
- AutomotiveTurning Radius Calculator (Ackermann Steering)Turning circle of a car, van or trailer from its wheelbase, track width and maximum steering angle, with how tight the inner rear wheel cuts in.
- AutomotiveTyre Tread Life Calculator (How Many Kilometres Until the Legal Limit)Distance and time left before your tyres — or brake pads — reach the legal minimum or the depth where you want to change them, from two measurements.
- AutomotiveTurbo Boost Pressure Ratio CalculatorPressure ratio, absolute pressure and air density gain of a turbocharged or supercharged engine from its boost, the atmospheric pressure and the intake temperature.
- AutomotiveBMEP Calculator (Brake Mean Effective Pressure from Torque and Displacement)The average pressure an engine would need to hold on its pistons throughout the cycle to produce its torque, plus power and output per litre.
- AutomotiveFuel Injector Size CalculatorInjector flow an engine needs for a target power, in cc/min and lb/h, from the number of injectors, the fuel consumption per horsepower and the maximum duty cycle.
- AutomotivePropeller Slip Calculator (Boat Prop Pitch, RPM and Speed)How much a boat propeller slips, from the engine rpm, gear ratio, propeller pitch and the speed through the water, plus the theoretical top speed with no slip.
- AutomotiveRegenerative Braking Energy CalculatorWork out how much energy braking releases and how much of it a car can put back in the battery.