How to calculate EV charging cost
Separate battery energy, charging losses and tariff fees before comparing home and public charging.
Automotive
Automotive: Practical explanations, worked examples and calculators for everyday decisions.
WLTP, CLTC, WLTC, EPA and NEDC range figures
Understand why driving-cycle range ratings are not interchangeable distance units.
PSI and bar for tire pressure
Convert pressure units while keeping gauge pressure and vehicle recommendations separate.
MPG, km/L and L/100 km explained
Understand reciprocal fuel economy and the difference between US and Imperial gallons.
Annual car ownership cost explained
Separate running costs, depreciation and finance without double-counting loan principal.
L/100 km to MPG: compare fuel economy and annual running cost
Convert US and imperial MPG correctly, estimate fuel bills and combine real driving records without averaging ratios incorrectly.
EV charging time: kWh, kW and charging losses
Estimate how long an electric vehicle takes to charge from one battery percentage to another, with a worked home-charging example.
EV vs petrol cost per trip: compare the same distance
Compare electricity and fuel for a journey using consumption per 100 km, energy prices and charging fees without confusing operating cost with total ownership.
Tire pressure in PSI, bar and kPa: check it cold
Convert tire pressure units correctly and find the recommended cold setting on the vehicle label instead of relying on the tire sidewall.
Car depreciation per mile: estimate the hidden driving cost
Combine purchase price, resale estimate and mileage to see the ownership cost that fuel-only comparisons miss.
EV home charging cost per year: a practical estimate
Use annual distance, energy per 100 km, charging losses and your electricity tariff to budget home charging.
How many EV charging stops do you need on a road trip?
Estimate charge stops from usable battery energy, real consumption and a comfortable arrival reserve before planning a long drive.
How a different tire size changes speedometer and distance readings
Compare tire diameters before changing wheel or tire size, and understand the speedometer estimate without confusing it with an approval.
How to estimate annual car mileage from daily driving
Turn commuting, weekend trips and occasional journeys into a realistic yearly distance and running-cost scenario.
Annual mileage for a lease or insurance quote: use odometer evidence
Project yearly driving from two odometer readings and check your allowance against a realistic buffer.
WLTP, EPA and CLTC EV range: why the numbers differ
Compare electric vehicle test-cycle labels without treating them as fixed real-world conversion factors.
EV charging cost with losses: home versus public charging
Separate battery energy from energy billed at the socket, then compare home and public tariff structures.
Tire size and rolling radius: calculate a speedometer change
Decode a size such as 225/55 R17 and compare diameter, circumference and indicated speed.
Tire circumference and revolutions per kilometre from a size marking
Turn nominal diameter into circumference and estimated revolutions, keeping millimetres, metres and kilometres consistent.
Annual mileage from two odometer readings
Estimate annual driving from actual readings, then compare the result with a weekly travel plan.
Power-to-weight in kW per tonne: compare like with like
Normalize power and vehicle mass before comparing a ratio.
Average trip speed: add the times of both legs
Use total distance and elapsed time when two parts of a journey have different speeds.
Round-trip fuel cost: count both directions once
Build a complete trip distance before multiplying consumption by the fuel price.