Fuel cost calculator

Type distance, consumption, and the pump price. The calculator multiplies trip liters by price: 420 km at 6.5 L/100 km and 6.39 per liter is about 174.45. That is fuel for one stretch, with no tolls and no TCO.

Need economy first? Use the fuel consumption calculator. Yearly budget: annual running cost. Full ownership: car TCO.

Input data

Results

Distance, economy, and pump price. Fuel cost shows up here.

How the results are calculated

One trip: liters = distance times L/100 km, then times price. 420 × 6.5 / 100 = 27.3 L, times 6.39 ≈ 174.45. 800 km at 7.2 L/100 km and 6.15 per liter is about 354.24. 150 km at 8.5 and 6.80 is 86.70. A 60 km jam at 9 L/100 km and 6.59 is about 35.59.

Advanced mode prices two segments separately, each with its own economy and price, then sums and multiplies by trip count. A consumption adjustment, for example 5%, raises liters before price. Buffer grows fuel quantity once per segment and is not applied again to money. A split between people cuts only the result, not the formula.

Quick fields are distance, consumption, and price. The US header relabels to miles, mpg or gallons per 100 miles, and price per gallon. A typed 420 is not rewritten as miles. A comma and a period in 6.5 and 6.39 both parse.

Tank economy lives on the fuel consumption page. A year of service and insurance lives on annual running cost. Receipts divided by mileage live on cost per km. Here it stays fuel for one trip.

Typed zero kilometers gives zero cost, because there are no liters to multiply. A blank distance does not fill 420 from the example. A minus is rejected. The result is an estimate from your three numbers, not a pump receipt.

Type 420, 6.5 and 6.39, click Calculate, and match about 174.45. Two segments of 280 km and 140 km at different prices are not the same as 420 km at an average, because each segment keeps its own liters and its own rate.

How to use

  1. In Quick mode, type distance, for example 420 km, consumption 6.5 L/100 km, and price 6.39.
  2. Click Calculate. 420 × 6.5 / 100 × 6.39 is about 174.45.
  3. In Advanced, turn on two segments if highway and city have different economy or a different price.
  4. Optionally add a consumption adjustment, a buffer, a trip count, or a split between people.
  5. Take tank economy from the fuel consumption page. Here you price a stretch, not TCO.

Trip fuel: consumption times pump price

Trip liters times price. 420 km at 6.5 L/100 km and 6.39 a liter is about 174.45 on the metric twin. Header units apply; no tolls.

consumption
The economy field. Metric 420 × 6.5 / 100 × 6.39 ≈ 174.45. A 260 distance at 32 and 3.45 is the first English placeholder set.
distance
The stretch. 90 at 35 economy and 3.65 is a short urban hop. Two segments and a split between people are options, not TCO.

Using this motoring calculator

  1. Quick mode: distance, economy and pump price - a fast single-trip budget.
  2. Advanced mode: two segments, adjustment, buffer, repeat trips and optional split between people.
  3. The segment chart appears only when two segments are active.
  4. Carry the figure into fuel consumption, annual running cost or TCO.

Fuel cost per mile (spend ÷ mileage)

Fuel cost per mile/km (spend ÷ mileage) calculator: fuel spend and total distance from the same period.

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Car running costs calculator

Car running costs calculator: annual mileage, fuel economy, pump price, plus service, insurance, tires, parking, and tax.

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Car TCO

TCO = purchase + financing + energy + running costs minus resale.

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MPG calculator

MPG calculator: miles and gallons in measure mode.

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Car depreciation calculator

Car depreciation calculator: starting value, period in years, and the annual decline rate.

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True cost of car ownership calculator

True cost of car ownership calculator: purchase, resale, ownership years, and yearly lines.

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All motoring calculators

Examples

Example 1

  • Distance: 260
  • Consumption: 32
  • Price: 3.45

≈ 287.04

What does 260 cost at 32 L/100 km and 3.45 a liter?

Example 2

  • Distance: 420
  • Consumption: 28
  • Price: 3.20

≈ 376.32

What does 420 cost at 28 L/100 km and 3.20 a liter?

Example 3

  • Distance: 90
  • Consumption: 35
  • Price: 3.65

≈ 114.98

What does 90 cost at 35 L/100 km and 3.65 a liter?

Frequently asked questions

What does 420 km cost at 6.5 L/100 km and 6.39 per liter?

27.3 L × 6.39 ≈ 174.45. 800 km at 7.2 and 6.15 is about 354.24. 150 km at 8.5 and 6.80 is 86.70.

Is 420 kilometers or miles?

It follows the header label. Metric uses 420 km. US wants miles and the economy printed on the label.

What does a 5% consumption adjustment do to 6.5?

It runs as 6.825 L/100 km, then times distance and price. Buffer grows liters once, not money a second time.

Are two segments of 280 and 140 the same as 420 averaged?

Not when economy or price differs. Each segment has its own liters. The sum is not one-field average.

Does the result include tolls and parking?

No. Fuel only. Tolls and full ownership live in TCO. Taxi is a separate card.

Does the US switch convert a typed 420?

No. On an empty field it relabels. It does not multiply a number you already typed.

What if distance is blank?

The calculator does not compute and does not fill 420 from the example. Quick mode needs three numbers.

Does a comma in 6.39 work?

Yes. 6,39 and 6.39 are the same price per liter. A comma and a period mean the same value.

What about 280 km at 5.8 L/100 km and 6.19?

About 100.53. 45 km at 8.2 and 6.89 is about 25.42. 1,200 km at 6.4 and 5.99 is about 460.03.

Where do I get 6.5 L/100 km if I have not filled up?

Measure it on the fuel consumption page from distance and fuel added. Here you already type a known economy.

Knowledge sources

Use and cost come from your own numbers. Below is the FuelEconomy.gov and EPA vocabulary.

Page updated in 2026.