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Annual Fuel Cost Calculator

See what fuel costs you per year.

How it is calculated

This tool works in metric units: distance in kilometres per year, consumption in litres per 100 km and price per litre. It first finds the litres used, then multiplies by the price: annual cost = distance ÷ 100 × consumption × price, and monthly cost = annual cost ÷ 12. The monthly figure is simply an even twelfth of the year, so it ignores months when you drive more, such as holidays. Results are shown in the tool's default currency with two decimals. Distance and consumption must be above zero and the price must not be negative, otherwise no result appears. For miles and MPG you must convert the numbers to km and L/100 km first.

Worked example

You drive 12,000 km a year in a car that uses 6.8 L/100 km, and fuel costs 1.72 per litre. Litres per year: 12,000 ÷ 100 × 6.8 = 816 litres. Annual cost: 816 × 1.72 = 1,403.52, shown as $1,403.52. Monthly cost: 1,403.52 ÷ 12 = 116.96, shown as $116.96. Every extra 1,000 km a year adds about 116.96 at these figures.

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Common mistakes

  • Typing miles per year while the field is in kilometres. A driver doing 10,000 miles needs to enter about 16,093 km, otherwise the cost comes out roughly 38 % too low.
  • Entering MPG in the consumption box. The unit is litres per 100 km, and the scale runs the other way: 7 L/100 km is thrifty, 7 MPG would be terrible.
  • Using the distance of a single trip or one month as the yearly distance. Check the odometer difference over a full 12 months.
  • Using today's pump price as if it will hold all year. Fuel prices move, so run a higher and lower price to see a range.
  • Treating the monthly figure as a bill. It is the annual cost divided by 12, so a month with a long road trip will be above it.

About this calculator

Annual fuel cost is a straightforward but easy-to-underestimate calculation: annual distance ÷ 100 × fuel consumption (litres per 100 km) × price per litre — for example, 20,000 km driven at 7 L/100 km and $1.50 per litre works out to $2,100 a year, or $175 a month (if you know your car’s miles per gallon, divide 235.2 by it to get L/100 km), a figure that rarely matches the vague mental estimate most drivers carry around.

Households use this figure to build a realistic transportation line item into a monthly budget, and it’s a key input when comparing two vehicles with different fuel economy ratings — a car that costs a bit more upfront but returns significantly better mileage can pay that premium back within a few years once annual fuel cost is calculated honestly rather than guessed at. Fleet managers and rideshare or delivery drivers use the same math at scale to forecast operating costs and to justify switching to more efficient or electric vehicles based on projected fuel savings.

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