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Fuel savings calculator

Compare the yearly fuel cost of two cars and see how much you'd save.

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The Fuel savings calculator turns Annual distance (km), Car A (L/100 km), Car B (L/100 km), Fuel price (per L) into Car A cost/year, Car B cost/year, Yearly saving, instantly and for free. For instance, with Annual distance (km) = 15,000, Car A (L/100 km) = 8, Car B (L/100 km) = 5 and Fuel price (per L) = $1.80 it returns Car A cost/year = $2,160.00, Car B cost/year = $1,350.00 and Yearly saving = $810.00.

How to use it

  1. Enter your values: Annual distance (km), Car A (L/100 km), Car B (L/100 km), Fuel price (per L).
  2. Read the result instantly: Car A cost/year, Car B cost/year, Yearly saving.

Frequently asked questions

What does the Fuel savings calculator actually compute?

It takes Annual distance (km), Car A (L/100 km), Car B (L/100 km) and Fuel price (per L) and derives Car A cost/year, Car B cost/year and Yearly saving from them. The calculation is live as you type, so the result updates on every change.

What information do I need to provide?

4 values: Annual distance (km), Car A (L/100 km), Car B (L/100 km) and Fuel price (per L) ($). Nothing else is required — no account, no file upload.

Can you show a worked example?

With Annual distance (km) = 15,000, Car A (L/100 km) = 8, Car B (L/100 km) = 5 and Fuel price (per L) = $1.80, the calculator returns Car A cost/year = $2,160.00, Car B cost/year = $1,350.00 and Yearly saving = $810.00. Those figures come from running this exact tool, so you can reproduce them by entering the same values.

What happens if I enter larger values?

It moves a lot. Using Annual distance (km) = 16,500, Car A (L/100 km) = 16, Car B (L/100 km) = 10 and Fuel price (per L) = $3.60 instead, Car A cost/year goes from $2,160.00 to $9,504.00 — which is why it is worth testing a few scenarios rather than trusting a single figure.

What does it give for smaller values?

Scaled down to Annual distance (km) = 13,500, Car A (L/100 km) = 4, Car B (L/100 km) = 2.5 and Fuel price (per L) = $0.90, Car A cost/year comes out at $486.00. The relationship is worth checking at both ends before you rely on a single result.

When would I actually use this?

Deciding between two cars, or between keeping one and replacing it: fuel or charging, insurance, depreciation and what a kilometre really costs.

What is the most common mistake?

Comparing on fuel alone. Depreciation is usually the largest line in the first years and dwarfs the difference in consumption between two comparable cars.

What is the difference between the Fuel savings calculator and the Fuel consumption calculator?

This one returns Car A cost/year and Car B cost/year; the Fuel consumption calculator returns Consumption (L/100 km) and Fuel cost. That is the whole difference — open the one whose figure you need.

Is there a tool for the next step?

Fuel cost calculator is the closest one after this: Estimate the fuel needed and its cost for a trip from distance and consumption.

What else is worth having open alongside it?

MPG calculator (fuel economy) and Fuel range calculator — they come up in the same task often enough to be worth a second tab.

Further reading

All guides →
ExplainerThe Fuel Saving That Is Not LinearGoing from 10 to 20 mpg saves six times more fuel than going from 30 to 40, over the same distance. The reason is that fuel used is the reciprocal of fuel economy — and it changes which vehicle you should replace first.GuideThe Real Cost of a Trip Is Not the FuelComparing a drive with a train ticket on fuel alone understates the car by a factor of five. Here is how to build the marginal cost of a trip, how to separate it from the fixed cost of ownership, and why both numbers are correct answers to different questions.How-toThe Real Cost Per Mile of Driving: Beyond Just FuelFuel is only part of what a mile costs. Add depreciation, insurance and maintenance to find your true cost per mile — and why it is higher than the pump suggests.How-toFuel Cost for a Road TripDivide distance by fuel economy, then multiply by the price. Here's the calculation, metric vs mpg, what pushes it up, and how to split the cost.ComparisonElectric or Petrol: From How Many Miles a Year Does It Pay Off?The break-even is a division, and the number underneath it moves more with where you charge than with which country you live in. Electricity and fuel prices from 2025 and 2026, the arithmetic in full, and the point at which an electric car stops saving anything at all.GuideMileage Allowances: the Official Scales in France, Spain and Italy, and What They Do Not CoverOne country gives you a formula that changes with the car's horsepower and the distance driven, one gives everybody the same figure per kilometre, and one publishes a table per model. All three are meant to cover the whole cost of running a car, and all three leave out things people assume are included.