How to Calculate Fuel Cost and Petrol Expense for a Journey in Pakistan?

Calculating fuel cost before travelling can help you estimate the total expense of a journey, decide how much petrol to put in your car, compare different routes, and prepare a realistic travel budget.

Whether you are travelling from Lahore to Islamabad, Multan to Lahore, Faisalabad to Islamabad, Karachi to Hyderabad, or making a local trip within your city, the basic calculation is the same.

The most important information you need is:

• Total journey distance

• Vehicle's average fuel consumption

• Current petrol price per litre

• Whether the journey is one-way or round trip

The basic formula is:

Fuel Required = Distance ÷ Vehicle Average (km per litre)

Then:

Fuel Cost = Fuel Required × Petrol Price per Litre

For example, if a journey is 300 km, your vehicle gives an average of 15 km per litre, and petrol costs Rs. 396.65 per litre:

Fuel Required = 300 ÷ 15 = 20 litres

Fuel Cost = 20 × Rs. 396.65 = Rs. 7,933

Therefore, the estimated petrol expense for the journey is Rs. 7,933.

Because fuel prices in Pakistan can change frequently, the petrol price should always be checked before making the final calculation. OGRA maintains official fuel-price publications, while the Ministry of Energy's Petroleum Division publishes petroleum-price updates.

What Information Do You Need to Calculate Petrol Cost?

You only need three main figures:

1. Journey Distance

Find the approximate road distance between your starting point and destination.

You can obtain the distance from a reliable navigation service or your vehicle's trip meter.

For a round trip, multiply the one-way distance by two.

For example:

One-way distance = 250 km

Round-trip distance = 250 × 2 = 500 km

2. Vehicle Fuel Average

Determine how many kilometres your vehicle can travel on one litre of petrol.

For example:

Vehicle average = 12 km/l

This means the vehicle can theoretically travel about 12 kilometres using one litre of petrol.

The actual average may change because of traffic, air-conditioning use, road conditions, vehicle load, tyre pressure, driving style and vehicle maintenance.

3. Current Petrol Price

You also need the current petrol price per litre.

Petrol prices in Pakistan can change, so avoid using an old price for a new journey calculation.

For example, the petrol price effective October 8, 2026 was reported at Rs. 396.65 per litre. This is a time-specific example, not a permanent rate. Check the latest official petroleum-price notification before using it for a current journey.

Main Formula for Calculating Fuel Cost

The easiest formula is:

Fuel Cost = (Distance ÷ Fuel Average) × Petrol Price

Where:

• Distance = total journey distance in kilometres

• Fuel Average = kilometres per litre

• Petrol Price = price of one litre of petrol

Example

Suppose:

• Distance = 400 km

• Fuel average = 14 km/l

• Petrol price = Rs. 396.65/litre

First calculate fuel required:

400 ÷ 14 = 28.57 litres

Then calculate fuel cost:

28.57 × Rs. 396.65 = approximately Rs. 11,337

So the estimated petrol cost is approximately Rs. 11,337.

Actual consumption can be slightly higher or lower.

How to Calculate Petrol Cost for a Round Trip

If you are returning to your starting point, you should calculate the total round-trip distance.

For example:

• Lahore to Islamabad = 375 km

• Islamabad to Lahore = 375 km

Total:

375 + 375 = 750 km

If your vehicle gives 15 km/l:

750 ÷ 15 = 50 litres

At a petrol price of Rs. 396.65 per litre:

50 × 396.65 = Rs. 19,832.50

Therefore, the estimated petrol cost for the round trip is Rs. 19,832.50.

This calculation does not include tolls, parking, food, accommodation, vehicle maintenance or other travel expenses.

How to Calculate Fuel Cost Per Kilometre

You can also calculate how much petrol costs for every kilometre travelled.

The formula is:

Fuel Cost Per KM = Petrol Price ÷ Vehicle Average

For example:

• Petrol price = Rs. 396.65/litre

• Vehicle average = 15 km/litre

Therefore:

Rs. 396.65 ÷ 15 = Rs. 26.44 per km

The vehicle's estimated petrol cost is approximately Rs. 26.44 per kilometre.

You can then multiply this figure by the journey distance.

For 500 km:

500 × Rs. 26.44 = approximately Rs. 13,220

Using the direct formula is usually more accurate because it avoids rounding the per-kilometre figure too early.

How to Calculate Fuel Cost for 100 Kilometres

A useful comparison is to calculate the fuel expense for every 100 km.

The formula is:

Fuel Required for 100 km = 100 ÷ Vehicle Average

Then:

Cost per 100 km = Fuel Required × Petrol Price

Suppose your vehicle gives 20 km/litre.

Fuel required:

100 ÷ 20 = 5 litres

At Rs. 396.65 per litre:

5 × 396.65 = Rs. 1,983.25

Therefore, the estimated petrol cost is Rs. 1,983.25 per 100 km.

This is useful when comparing two vehicles.

How to Calculate Fuel Cost When the Vehicle Gives KM/L

Many Pakistani drivers describe fuel economy as kilometres per litre.

For example:

• 10 km/l

• 12 km/l

• 15 km/l

• 18 km/l

• 20 km/l

The formula is straightforward:

Fuel Required = Distance ÷ KM/L

Suppose:

Distance = 600 km

Average = 12 km/l

Then:

600 ÷ 12 = 50 litres

At Rs. 396.65/litre:

50 × 396.65 = Rs. 19,832.50

Estimated petrol cost:

Rs. 19,832.50

How to Calculate Fuel Cost When Fuel Economy Is Given as Litres per 100 KM

Some vehicles or specifications use litres per 100 kilometres (L/100 km) instead of km/l.

In this case, the formula is different.

Fuel Required = Distance × (Litres per 100 km ÷ 100)

For example:

• Distance = 500 km

• Fuel consumption = 8 litres/100 km

Fuel required:

500 × 8 ÷ 100 = 40 litres

At Rs. 396.65/litre:

40 × 396.65 = Rs. 15,866

Estimated petrol cost:

Rs. 15,866

A lower L/100 km figure generally means lower fuel consumption.

How to Convert KM/L to L/100 KM

You may want to compare fuel figures presented in different formats.

The formula is:

L/100 km = 100 ÷ KM/L

For example:

15 km/l

becomes:

100 ÷ 15 = 6.67 L/100 km

Similarly:

20 km/l

becomes:

100 ÷ 20 = 5 L/100 km

This conversion can help when comparing vehicle specifications.

How to Calculate Fuel Cost Using a Vehicle's Trip Meter

One of the best ways to determine your actual vehicle average is to use the vehicle's trip meter.

A simple method is:

1. Fill the fuel tank or add a known quantity of petrol.

2. Reset the trip meter.

3. Drive normally.

4. Record the distance travelled.

5. Refill the vehicle.

6. Record how many litres were needed to refill it.

7. Divide kilometres travelled by litres used.

For example:

• Distance travelled = 360 km

• Petrol used = 24 litres

Fuel average:

360 ÷ 24 = 15 km/l

This gives you a practical estimate based on your actual driving rather than relying only on the manufacturer's claimed fuel economy.

Why the Vehicle's Advertised Average May Be Different

A vehicle's advertised or claimed fuel economy is not necessarily the same as what you will achieve on Pakistani roads.

Actual fuel consumption can be affected by:

Traffic

Frequent stopping and starting can increase fuel consumption.

Air Conditioning

Running the air conditioner can affect fuel economy, particularly in hot weather and heavy traffic.

Driving Style

Rapid acceleration, high-speed driving and unnecessary braking can increase fuel consumption.

Vehicle Load

A heavily loaded vehicle may consume more fuel than the same vehicle travelling with a light load.

Tyre Pressure

Incorrect tyre pressure can affect rolling resistance and fuel efficiency.

Road Conditions

Traffic congestion, road quality, hills and frequent stops can change consumption.

Vehicle Condition

Poor maintenance can negatively affect fuel economy.

Therefore, it is better to use your vehicle's real-world average when preparing a travel budget.

How to Calculate Fuel Cost for City Driving

City driving can be more difficult to estimate because traffic conditions vary.

Suppose:

• Total city distance = 150 km

• Real-world average = 10 km/l

• Petrol price = Rs. 396.65/litre

Fuel required:

150 ÷ 10 = 15 litres

Cost:

15 × 396.65 = Rs. 5,949.75

Estimated petrol expense:

Rs. 5,949.75

If traffic is particularly heavy, actual consumption could be higher.

How to Calculate Fuel Cost for Highway Driving

Highway fuel economy may differ from city driving.

Suppose:

• Distance = 600 km

• Highway average = 16 km/l

• Petrol price = Rs. 396.65/litre

Fuel required:

600 ÷ 16 = 37.5 litres

Fuel cost:

37.5 × 396.65 = Rs. 14,874.38

Estimated petrol expense:

Approximately Rs. 14,874

The actual result will depend on driving conditions.

How to Calculate Fuel Cost for a Car Trip Between Two Cities

For an intercity journey, follow these steps:

1. Determine the road distance.

2. Decide whether you need a one-way or round-trip calculation.

3. Estimate your realistic vehicle average.

4. Check the latest petrol price.

5. Divide distance by average.

6. Multiply the required litres by petrol price.

7. Add a reasonable allowance for local driving, detours and traffic if necessary.

For example:

Journey distance = 450 km

Round trip = 900 km

Vehicle average = 15 km/l

Petrol price = Rs. 396.65/litre

Fuel required:

900 ÷ 15 = 60 litres

Fuel cost:

60 × 396.65 = Rs. 23,799

Estimated petrol cost:

Rs. 23,799

You may want to keep an additional budget for unexpected detours, city driving or traffic-related fuel consumption.

How to Calculate Petrol Cost for Multiple Vehicles

Suppose you want to compare two vehicles for the same 500 km journey.

Vehicle A

Average = 10 km/l

Fuel required:

500 ÷ 10 = 50 litres

At Rs. 396.65:

50 × 396.65 = Rs. 19,832.50

Vehicle B

Average = 15 km/l

Fuel required:

500 ÷ 15 = 33.33 litres

Cost:

33.33 × 396.65 ≈ Rs. 13,221.67

Approximate saving with Vehicle B:

Rs. 19,832.50 − Rs. 13,221.67 = Rs. 6,610.83

This demonstrates how fuel efficiency can significantly affect travel expenses.

How to Calculate Petrol Expense for a Motorcycle

The same formula works for motorcycles.

Suppose:

• Distance = 300 km

• Motorcycle average = 40 km/l

• Petrol price = Rs. 396.65/litre

Fuel required:

300 ÷ 40 = 7.5 litres

Fuel cost:

7.5 × 396.65 = Rs. 2,974.88

Estimated petrol expense:

Approximately Rs. 2,975

Motorcycle fuel consumption varies according to engine size, riding style, traffic, load and maintenance.

How to Calculate Fuel Cost for a Carpool

If several people are sharing the petrol expense, first calculate the total fuel cost.

Suppose:

• Total fuel cost = Rs. 8,000

• Four people are sharing equally

Cost per person:

Rs. 8,000 ÷ 4 = Rs. 2,000

If the driver is also included in the equal sharing arrangement, four people each pay Rs. 2,000.

If only three passengers are contributing while the driver does not contribute, divide the cost according to the agreed arrangement.

Fuel Cost Is Not the Same as Total Journey Cost

Petrol is only one part of the cost of travelling by car.

A complete journey budget may also include:

• Motorway tolls

• Highway tolls

• Parking

• Food and drinks

• Accommodation

• Vehicle maintenance

• Tyres

• Oil and filters

• Unexpected repairs

• Car washing

• Other travel expenses

Therefore:

Total Journey Cost = Fuel Cost + Tolls + Parking + Food + Accommodation + Other Expenses

If your goal is only to calculate petrol expense, use the fuel-cost formula. If you are preparing a complete travel budget, include the other expenses separately.

How to Include a Fuel Reserve

It is often sensible to budget slightly more than the mathematical fuel estimate.

For example, your calculation may show:

Estimated petrol cost = Rs. 10,000

You may choose to budget:

Rs. 11,000 or Rs. 12,000

depending on the journey and expected conditions.

The extra amount is not part of the mathematical fuel cost. It is simply a contingency allowance.

A reserve can help cover:

• Traffic

• Detours

• Wrong turns

• Local driving

• Road diversions

• Unexpected stops

• Lower-than-expected fuel economy

How to Calculate Monthly Petrol Expense

The same method can be used to estimate monthly fuel expenses.

Suppose you drive:

60 km per day

for:

26 days per month

Monthly distance:

60 × 26 = 1,560 km

If your vehicle averages:

12 km/l

Monthly petrol requirement:

1,560 ÷ 12 = 130 litres

At Rs. 396.65/litre:

130 × 396.65 = Rs. 51,564.50

Estimated monthly petrol expense:

Rs. 51,564.50

This can be useful for household budgeting, employee travel budgets and business vehicle expenses.

How to Calculate Annual Petrol Expense

You can also estimate yearly petrol expenses.

Suppose your vehicle travels:

20,000 km per year

and averages:

14 km/l

Annual petrol requirement:

20,000 ÷ 14 = 1,428.57 litres

If petrol were Rs. 396.65 per litre:

1,428.57 × 396.65 ≈ Rs. 566,643

This is only an estimate because petrol prices can change throughout the year.

For a more realistic annual budget, calculate expected fuel costs using different possible petrol prices.

How Petrol Price Changes Affect Your Journey

Fuel-price changes can have a noticeable effect on travel costs.

Suppose your journey requires:

40 litres

If petrol costs Rs. 350/litre:

40 × 350 = Rs. 14,000

If petrol rises to Rs. 400/litre:

40 × 400 = Rs. 16,000

The same journey would cost:

Rs. 2,000 more

Therefore, drivers who frequently travel long distances should monitor fuel prices.

Pakistan's official OGRA fuel-price portal publishes petroleum price information, and the Petroleum Division also publishes petroleum-product price updates.

How to Calculate Fuel Cost for a Business Journey

Businesses can use the same formula for official travel.

For example:

• Business trip distance = 800 km

• Vehicle average = 13 km/l

• Petrol price = Rs. 396.65/litre

Fuel required:

800 ÷ 13 = 61.54 litres

Fuel expense:

61.54 × Rs. 396.65 ≈ Rs. 24,406

The company can then separately record tolls, parking and other approved travel expenses according to its own accounting and reimbursement policy.

How to Calculate Fuel Reimbursement

If an employer reimburses an employee for fuel based on actual consumption, the basic calculation can be:

Reimbursement = Approved Distance ÷ Vehicle Average × Applicable Petrol Rate

For example:

• Approved distance = 500 km

• Average = 15 km/l

• Petrol rate used for reimbursement = Rs. 396.65/litre

Fuel required:

500 ÷ 15 = 33.33 litres

Estimated reimbursement:

33.33 × 396.65 ≈ Rs. 13,222

However, employers may use their own approved mileage rates or reimbursement policies, so the actual amount paid may differ from the mathematical fuel cost.

How to Calculate Fuel Cost Without Knowing the Exact Average

If you do not know your vehicle's average, you have several options.

You can:

• Check the vehicle's manual or specifications.

• Review previous fuel records.

• Calculate actual consumption using the full-tank method.

• Use your recent trip-meter data.

• Estimate separately for city and highway driving.

For budgeting, using a realistic lower average is often safer than assuming an optimistic fuel-economy figure.

For example, if your vehicle sometimes gives 14–16 km/l, you might calculate the expected trip using 14 km/l and treat the result as a conservative estimate.

Simple Petrol Cost Formula

For most users, the following formula is enough:

Petrol Cost = (Journey Distance ÷ Vehicle Average) × Petrol Price

Example:

Distance = 300 km

Average = 15 km/l

Petrol Price = Rs. 396.65/litre

Therefore:

(300 ÷ 15) × 396.65

= 20 × 396.65

= Rs. 7,933

Estimated petrol cost:

Rs. 7,933

Quick Fuel Cost Examples

Example 1: 100 km Journey

Average = 15 km/l

Fuel required:

100 ÷ 15 = 6.67 litres

At Rs. 396.65:

6.67 × 396.65 ≈ Rs. 2,644

Example 2: 200 km Journey

Average = 15 km/l

Fuel required:

200 ÷ 15 = 13.33 litres

Fuel cost:

13.33 × 396.65 ≈ Rs. 5,289

Example 3: 500 km Journey

Average = 15 km/l

Fuel required:

500 ÷ 15 = 33.33 litres

Fuel cost:

33.33 × 396.65 ≈ Rs. 13,222

Example 4: 1,000 km Journey

Average = 15 km/l

Fuel required:

1,000 ÷ 15 = 66.67 litres

Fuel cost:

66.67 × 396.65 ≈ Rs. 26,443

These examples use the October 8, 2026 petrol rate only for illustration. The actual cost should be recalculated using the petrol price applicable when you travel.

How to Make Your Fuel Cost Estimate More Accurate

For a more realistic estimate:

1. Use actual road distance rather than straight-line distance.

2. Include the return journey if applicable.

3. Use your vehicle's real-world average.

4. Consider whether the journey is mainly city or highway driving.

5. Consider air-conditioning use.

6. Account for passengers and luggage.

7. Check the latest petrol price before travelling.

8. Add a reasonable contingency for detours and traffic.

9. Keep fuel receipts to compare estimated and actual costs.

10. Recalculate your average periodically.

Final Formula

The easiest formula to remember is:

Fuel Required = Distance ÷ Vehicle Average

Then:

Fuel Cost = Fuel Required × Petrol Price

Or combine them:

Fuel Cost = (Distance ÷ Vehicle Average) × Petrol Price

For a round trip:

Fuel Cost = (One-Way Distance × 2 ÷ Vehicle Average) × Petrol Price

For a complete travel budget:

Total Journey Cost = Fuel Cost + Tolls + Parking + Food + Accommodation + Other Expenses

Petrol prices in Pakistan are subject to change, so a fuel-cost calculation should always use the latest applicable petrol price rather than an old rate. OGRA's official price portal and the Ministry of Energy's Petroleum Division are useful official sources for checking current petroleum-price information.

Once you know your vehicle's actual average, calculating the petrol expense for almost any journey becomes very simple. The most reliable approach is to keep a record of kilometres travelled and litres consumed over several refills, calculate your real-world average, and then use that figure with the latest petrol price.

Guide Information

Step-by-Step Process

1. Decide which journey you want to calculate.

2. Identify the starting point of the journey.

3. Identify the destination.

4. Find the approximate road distance between the two locations.

5. Do not use straight-line distance when calculating vehicle fuel requirements.

6. Decide whether you need a one-way or round-trip calculation.

7. Double the one-way distance if you will return to the starting point using approximately the same route.

8. Add any known extra local driving or detours to the estimated distance.

9. Identify the vehicle you will use for the journey.

10. Find the vehicle's expected fuel economy if you do not have actual fuel records.

11. Prefer your vehicle's real-world fuel average when reliable records are available.

12. Express the fuel average in kilometres per litre if using the standard km/l calculation.

13. If your vehicle's consumption is given in litres per 100 kilometres, convert it or use the corresponding L/100 km formula.

14. Check recent fuel records if you want to determine your actual fuel average.

15. Record the kilometres travelled between two fuel refills.

16. Record the number of litres required to refill the vehicle.

17. Divide kilometres travelled by litres consumed to calculate actual km/l.

18. Check the latest petrol price applicable in Pakistan before making the final estimate.

19. Prefer an official petroleum-price source such as OGRA or the Petroleum Division for the current rate.

20. Enter the total journey distance in kilometres.

21. Enter the vehicle's average in kilometres per litre.

22. Divide the total distance by the vehicle average.

23. The result represents the estimated litres of petrol required.

24. Multiply the estimated litres by the current petrol price per litre.

25. The result is the estimated petrol expense for the journey.

26. Round the result to a practical amount when preparing a travel budget.

27. Consider whether heavy traffic could reduce the actual fuel average.

28. Consider air-conditioning use, especially during hot weather.

29. Consider passengers and luggage because additional weight can affect consumption.

30. Consider road conditions, hills, frequent stops and driving style.

31. Add a reasonable fuel contingency if the journey involves uncertain traffic or detours.

32. Keep fuel cost separate from motorway or highway tolls.

33. Keep parking costs separate from petrol expense.

34. Keep food and accommodation separate if preparing a complete journey budget.

35. For a business trip, identify the approved reimbursement policy if the employer pays travel expenses.

36. For a carpool, calculate the total fuel cost first.

37. Divide the agreed fuel cost among passengers according to the carpool arrangement.

38. For monthly budgeting, estimate total kilometres driven during the month.

39. Divide monthly kilometres by the vehicle's average fuel economy.

40. Multiply the estimated monthly litres by the expected petrol price.

41. For annual budgeting, estimate the total annual kilometres driven.

42. Divide annual kilometres by the expected average fuel economy.

43. Multiply annual fuel consumption by an estimated petrol price.

44. Remember that annual fuel cost can change substantially if petrol prices change.

45. Compare your estimated fuel expense with previous actual fuel expenses.

46. Recalculate your vehicle's actual fuel average periodically.

47. Use a conservative fuel average when preparing a budget if your consumption varies significantly.

48. Check the latest official petrol price again before a long journey.

49. Record the actual petrol purchased during the journey if you want to compare the estimate with real expenditure.

50. Use the actual result to improve future fuel-cost estimates.