How Many Litres of Fuel Do You Need per Month for 500, 1,000, 1,500 or 2,000 km?

Many drivers know their car's average fuel consumption — for example, 6.5 or 8 litres per 100 kilometres. But answering another very practical question is often much harder: how many litres of fuel do I actually need for an entire month?

If you drive 500 kilometres per month, the answer will be very different from that of a driver covering 2,000 kilometres. The car itself makes an even bigger difference — an efficient vehicle using 5 l/100 km and a car using 10 l/100 km will consume twice as much fuel over the same monthly distance.

The good news is that this calculation is extremely simple. You only need two figures: your monthly mileage and your average fuel consumption.

Monthly fuel use does not have to be a guess. If you know your mileage and fuel consumption, you can calculate it in a few seconds.

Main table: how many litres do you need per month?

The table below shows how many litres of fuel are required at different monthly distances and average fuel-consumption figures.

This table makes the scale easy to understand. If you drive 1,000 km per month and your car uses 7 l/100 km, you need around 70 litres. If you drive 2,000 km with a consumption of 10 l/100 km, you need approximately 200 litres.

The formula is very simple

For example, you drive 1,350 km per month and your average fuel consumption is 6.8 l/100 km.

1,350 ÷ 100 × 6.8 = 91.8 litres.

So you will need approximately 92 litres of fuel per month.

Your monthly mileage does not have to be exactly 500, 1,000 or 2,000 km. The formula works with any number.

If you drive only 500 km per month

500 kilometres per month is not particularly high mileage. Spread across every day of the month, it works out to roughly 16–17 kilometres per day.

At this mileage, fuel use will be:

• 5 l/100 km — 25 litres;
• 6 l/100 km — 30 litres;
• 7 l/100 km — 35 litres;
• 8 l/100 km — 40 litres;
• 10 l/100 km — 50 litres.

Even at relatively low mileage, the difference between an economical and a less economical car already reaches 25 litres per month.

If you drive 1,000 km per month

For many drivers, 1,000 km per month is a realistic everyday distance. It can include commuting, shopping, taking children to school, weekend trips and other routine journeys.

At this distance, the calculation becomes especially easy because the consumption per 100 km simply needs to be multiplied by ten.

If your car uses 7.5 l/100 km, then at 1,000 km per month the result is 75 litres. It really is that simple.

If you drive 1,500 km per month

At 1,500 km per month, fuel budgeting becomes more important because even a small difference in consumption starts to mean dozens of litres.

For example:

• a car using 5 l/100 km will consume 75 litres;
• a car using 7 l/100 km will consume 105 litres;
• a car using 10 l/100 km will consume 150 litres.

The difference between 5 and 10 l/100 km is already 75 litres in a single month.

Over a year, if the mileage remains similar, that becomes a difference of 900 litres.

If you drive 2,000 km per month

Driving 2,000 kilometres per month means approximately 24,000 kilometres per year. At this level of use, fuel consumption becomes a significant part of the total cost of running a car.

At 2,000 km per month:

• 5 l/100 km = 100 litres;
• 6 l/100 km = 120 litres;
• 7 l/100 km = 140 litres;
• 8 l/100 km = 160 litres;
• 10 l/100 km = 200 litres.

This clearly shows why even a difference of one litre per 100 km becomes important for drivers with high annual mileage.

How much does that cost per month?

Once you know the number of litres, converting it into money is very simple.

To make the examples easy to compare, we will use €1.60/l as a simple example price. This is not presented as today's fuel price — use the current price at your filling station for your own calculation.

If the car uses 7 l/100 km:

This is only the fuel budget. It does not include insurance, tyres, oil changes, repairs, taxes, parking or vehicle depreciation.

How many tanks is that per month?

For some people, litres can feel a little abstract. It may be easier to think in terms of full tanks.

Suppose the car has an approximately 50-litre fuel tank and averages 7 l/100 km.

Of course, in real life drivers almost never use a fuel tank down to absolute zero, and the amount added at each refill varies. This is therefore only a visual comparison.

How can you find your real monthly mileage?

Many drivers do not actually know how far they travel each month. You may feel that you drive “around a thousand kilometres”, while the real figure could be 700 or 1,400 km.

The easiest method is:

1. record the odometer reading on the first day of the month;
2. record it again at the end of the month;
3. subtract the starting reading from the ending reading.

For example:

158,420 km − 157,180 km = 1,240 km per month.

If the car averages 7.2 l/100 km:

1,240 ÷ 100 × 7.2 = 89.28 litres per month.

Which fuel-consumption figure should you use?

This is important. If you enter an unrealistic consumption figure into the formula, the result will also be unrealistic.

You can use:

• the long-term average shown by your trip computer;
• an average calculated across several full tanks;
• the average from your previous refuelling records.

If your trip computer and full-tank calculation do not match, read our article about why the trip computer can show lower fuel consumption than your calculation from fuel receipts.

Should you use the official fuel-consumption figure for your monthly budget?

For budgeting, it is usually better to use the consumption figure you actually see in your everyday driving.

The same car can have very different fuel consumption depending on:

• city or motorway driving;
• short or long journeys;
• traffic congestion;
• driving speed;
• cold or warm weather;
• tyres and tyre pressure;
• air conditioning and heating use;
• driving style.

That is why your own long-term average is generally more practical for a monthly budget.

What does just 1 litre per 100 km more really mean?

Over one short trip, a difference of one litre per 100 km may not seem particularly important.

But over a month, the picture changes.

That is exactly why vehicle efficiency becomes increasingly important as annual mileage rises.

How to create a monthly fuel budget

If you do not want every visit to the filling station to feel like an unexpected expense, fuel can be budgeted in much the same way as phone bills, electricity or other monthly costs.

For example:

• mileage — 1,200 km;
• fuel consumption — 7.5 l/100 km;
• fuel required — 90 litres;
• at €1.60/l — €144 per month.

You can add a small reserve to the budget because not every month will be identical. There may be an extra journey, more traffic, colder weather or a longer weekend trip.

Mini test: how much fuel do you need?

30-day experiment: find your real monthly fuel budget

If you currently just refuel whenever the warning light comes on, try recording everything for one month.

After a few months, you will have a much more accurate understanding not only of your car's fuel consumption but also of how much money you should set aside for fuel at the beginning of each month.

Frequently asked questions

Conclusion

You do not need a complicated calculation to understand how much fuel you need each month. You only need two figures — your mileage and average fuel consumption.

At 7 l/100 km, 500 kilometres requires 35 litres, 1,000 kilometres requires 70 litres, 1,500 kilometres requires 105 litres and 2,000 kilometres requires 140 litres per month.

The more you drive, the more important every tenth of a litre becomes. For a driver covering only a few hundred kilometres per month, an extra litre per 100 km may not feel especially significant. At 2,000 or 3,000 kilometres per month, however, it quickly turns into dozens of extra litres.

That is why it is worth knowing not only what your dashboard shows but also your real monthly mileage. Once you know both figures, you can plan your fuel budget much more accurately.

If you want to calculate not only litres but also the cost of a specific journey, you can use our fuel consumption calculator guide.

Driver's short takeaway: kilometres ÷ 100 × fuel consumption = litres per month. Once you know those two figures, your monthly fuel spending no longer has to be a guess.