Automotive

What a journey, a trip or a mile actually costs to drive.

• Cost Per Mile Calculator The true running cost of every mile — fuel plus servicing, tyres, insurance and depreciation.
• Fuel Cost Calculator What a journey costs in fuel — from the distance, your economy in any unit, and the pump price.
• Road Trip Cost Calculator Total fuel cost for a road trip, with the return leg and the cost split between passengers.

Charging cost and time, realistic range, and the comparison against petrol.

• EV Charging Cost Calculator What it costs to charge an electric car — including the charging losses you pay for but never store.
• EV Charging Time Calculator How long an electric car takes to charge, from the charger power, battery size and the charge you are adding.
• EV Range Calculator Real-world range from battery size and consumption, with the effect of speed, cold and a usable-charge reserve.
• EV vs Petrol Running Cost Calculator Compare the annual running cost of an electric car against petrol or diesel, and find how long a price premium takes to pay back.

Sidewall codes, rolling diameter, speedometer error, offset and backspacing.

• Tire Size Calculator Compare two tyre sizes — diameter, circumference, sidewall height, and how far the speedometer will read out.
• Wheel Offset & Backspacing Calculator Convert between wheel offset and backspacing, and see how a change moves the wheel in or out.

Gear ratios, final drive, and the link between engine speed and road speed.

• Gear Ratio Calculator Gear ratio from tooth counts, the overall ratio through the final drive, and what it means for acceleration against top speed.
• RPM to Speed Calculator Road speed from engine RPM, gearing and tyre size — with a speed-per-gear table at your chosen revs.