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Automotive

The Automotive calculators cover the running costs of owning and driving a car. Turn distance and fuel economy into the cost of a trip or a year of driving, compare MPG with L/100km, split a road-trip budget across passengers, size a car loan payment, and decode tire size markings into real dimensions.

Each tool uses exact conversion factors and shows the formula, so the numbers hold up whether you are comparing two cars or planning a holiday drive.

Fuel Cost Calculator Calculate how much fuel any drive will cost from distance, consumption (L/100km or MPG) and fuel price. Fuel Economy Calculator Measure your real fuel economy from a fill-up: distance driven and fuel used give MPG or L/100km, with instant conversion between the two. Trip Cost Calculator Budget a road trip: total fuel cost for one-way or round trips, with cost per passenger. Car Loan Calculator Calculate monthly car loan payments from vehicle price, down payment, rate and term. Tire Size Calculator Decode tire markings like 205/55 R16: overall diameter, sidewall height, circumference and revolutions per km.

Frequently asked questions

How do I convert MPG to L/100km?

For US gallons: L/100km = 235.21 ÷ MPG. For imperial gallons the constant is 282.48. The Fuel Economy Calculator converts in both directions and explains the US/UK gallon difference.

How do I calculate the fuel cost of a trip?

Fuel needed = distance × (L/100km ÷ 100), then multiply by the price per litre. The Fuel Cost Calculator runs this for any distance and price.

How is the cost per passenger worked out?

The Trip Cost Calculator divides the total fuel cost (plus any tolls or extras you add) by the number of passengers sharing the journey.

How do I read a tire size like 205/55 R16?

205 is the tread width in mm, 55 is the sidewall height as a percentage of the width, R means radial, and 16 is the wheel rim diameter in inches. The Tire Size Calculator converts this into total diameter and circumference.

Can I compare two car loans here?

Yes — run the Car Loan Calculator with each APR and term to see the monthly payment and total interest side by side, so the cheaper offer is obvious.