Fuel, Mileage & Trip Cost calculator

Fuel Cost Calculator

Estimate trip fuel, total travel cost, per-person sharing, monthly commute expense, measured mileage, and savings from better efficiency.

Category: TravelLast updated: 7 June 2026

Interactive calculator

Estimate fuel, travel cost, sharing, and savings

Use one mode for a trip, recurring commute, measured mileage, or a better-efficiency scenario. No live fuel price or route data is assumed.

What do you want to calculate? Choose one question. Only the measurements needed for that mode are shown.

Trip fuel and total cost

Use ₹/litre and km/L for most India petrol or diesel estimates. Select mpg and gallons only when those are the source units.

Trip distance

Enter the one-way distance, then select return trip separately when needed. Trip distance unit Include the return journey? Vehicle mileage / efficiency

Use a realistic city, highway, or mixed-driving figure for this trip. Mileage / efficiency unit Fuel price

Enter the current price you want to plan with. No live petrol or diesel price is fetched. Fuel price unit People sharing the cost (optional)

Use 1 when the cost is not being split. Enter a whole number.

Optional trip extras

Add only known amounts. The calculator does not look up tolls, parking, food, hotels, or maintenance.

Tolls (optional)

Parking (optional)

Other trip cost (optional)

Optional food, permit, ferry, or another known travel amount. Maintenance is not inferred.

Currency

Currency symbol or code

Examples: ₹, $, €, £, USD. The calculator does not convert currency.

The symbol changes display only. No currency conversion is performed.

Trip fuel cost

₹3,360

total trip estimate including entered extras

₹3,360 each

Total trip distance: 480 km (298.26 miles)
Fuel required: 32 L (8.45 US gal)
Fuel cost: ₹3,360
Extra costs entered: ₹0
Total travel estimate: ₹3,360
Cost per person: ₹3,360
Total cost per distance: ₹7/km · ₹11.27/mile

What this means

This 480 km (298.26 miles) trip may use about 32 L (8.45 US gal) and cost ₹3,360 for fuel. With entered extras, the travel estimate is ₹3,360. Split between 1 person, that is about ₹3,360 each.

Decision guidance

No toll, parking, food, hotel, or maintenance cost is included. Confirm the actual route distance and current local fuel price before leaving, especially when traffic or detours can change consumption.

Unit check

For km/L or mpg, a higher number means better efficiency.

What can change the real result

This estimate has no live route, traffic, fuel-price, or toll data. City traffic, AC use, load, tyre pressure, road condition, and driving style can change real mileage.

Next calculator

For regular travel, add the monthly amount to Monthly Budget Calculator. Use Unit Converter when the source distance, fuel, or gallon standard is unclear.

Monthly Budget Calculator Unit Converter Percentage Calculator

Method used

Fuel used = total distance ÷ efficiency in km/L; fuel cost = fuel used × price per litre; total = fuel cost + entered extras; split = total ÷ people.

What to do next

Continue your decision

Formula, example, assumptions, and FAQs — open any section for the detail.

Formula

Distance, fuel, and price normalization

Distance → km · Fuel → litres · Fuel price → price per litre

The calculator converts miles to kilometres, US or UK gallons to litres, and gallon prices to a litre price before calculating. A US gallon is 3.785411784 L; a UK gallon is 4.54609 L.

Fuel used from efficiency

km/L: fuel = distance ÷ km/L · L/100 km: fuel = distance × L/100 km ÷ 100

For mpg, miles and the selected US or UK gallon are converted to km/L first. Higher km/L or mpg is better; lower L/100 km is better.

Trip cost and sharing

Fuel cost = fuel used × price/L · Total = fuel + tolls + parking + other entered cost · Per person = total ÷ people

The total includes only extras entered by the user. It does not infer tolls, parking, food, hotels, permits, maintenance, or depreciation.

Monthly commute cost

Monthly distance = one-way distance × trips/day × days/month · Yearly fuel cost = monthly fuel cost × 12

Enter one-way trips explicitly. A normal home-to-work return journey is usually two one-way trips per day. Optional recurring travel extras are shown separately from fuel.

Mileage helper and savings

Measured km/L = distance km ÷ fuel litres · Savings = current monthly fuel cost − improved monthly fuel cost

The helper expresses one measured fill in all four efficiency units. The savings mode holds monthly distance and fuel price constant to isolate the effect of better mileage.

Worked example

Example for a 480 km shared trip

A 480 km one-way trip uses a vehicle estimated at 15 km/L. Fuel is entered at ₹105 per litre, four people share the cost, and no toll or parking amount is added.

Calculation:Fuel required: 480 ÷ 15 = 32 L. Fuel cost: 32 × ₹105 = ₹3,360. Per-person fuel share: ₹3,360 ÷ 4 = ₹840.

Result:The trip may use about 32 litres and cost around ₹3,360 for fuel, or ₹840 per person. Tolls, parking, food, hotels, maintenance, traffic, and route changes are excluded unless entered or checked separately.

Assumptions

Distance is converted to kilometres internally and fuel quantity is converted to litres.
Fuel prices are converted to price per litre using the selected litre, US gallon, or UK gallon standard.
The entered mileage or efficiency represents the expected conditions for the trip or commute.
Return-trip mode doubles the entered one-way trip distance.
Commute trips per day means one-way trips; two normally represents travelling out and back.
Monthly and yearly commute figures assume the same entered pattern repeats.
Per-person sharing divides all entered trip costs equally and does not apply different contributions.
The mileage helper assumes the entered distance and fuel belong to the same measurement period.
The savings scenario holds monthly distance and fuel price constant.
Currency is for display only; no exchange-rate conversion is performed.

Common mistakes

Using highway mileage for a city commute where traffic and idling reduce efficiency.
Entering km/L as L/100 km, or treating lower L/100 km as worse rather than better.
Using mpg without checking whether the source means a US gallon or UK gallon.
Entering a one-way distance and also doubling trips per day incorrectly.
Adding a return trip when the entered distance already includes both directions.
Using an old fuel price and treating the result as a current petrol or diesel quote.
Sharing only fuel cost while forgetting entered tolls and parking in the group total.
Assuming the estimate includes food, hotels, maintenance, tyres, servicing, insurance, or vehicle depreciation.
Comparing one short mileage reading with a longer full-tank measurement without considering pump cutoff and traffic differences.

Accuracy notes

Unit conversions and arithmetic are deterministic, with distance, fuel, efficiency, and money rounded for display. Accuracy depends mainly on route distance, real city or highway mileage, the entered fuel price, commute frequency, and complete extra costs. The calculator has no live route, traffic, toll, or fuel-price data.

Frequently asked questions

How do I calculate fuel cost for a trip?

Convert distance and mileage to compatible units, divide distance by km/L to estimate litres, then multiply by price per litre. Add toll, parking, or another known amount separately. This calculator performs those conversions for km, miles, L/100 km, and mpg.

Which units should I use in India?

Use ₹/litre and km/L for most India petrol or diesel estimates. Enter a current local price yourself because prices vary by city and change frequently. No live fuel-price service is used.

What is the difference between km/L and L/100 km?

km/L shows distance travelled per litre, so higher is better. L/100 km shows litres consumed over 100 km, so lower is better. They describe the same efficiency in opposite directions.

Are US mpg and UK mpg the same?

No. Both use miles, but a UK imperial gallon is larger than a US gallon. The same vehicle efficiency has a higher numerical mpg UK value than mpg US. Select the standard used by the source.

Why can real fuel use be higher than the estimate?

City traffic, idling, AC use, passengers or luggage, tyre pressure, road condition, gradients, speed, weather, vehicle condition, and driving style can all reduce real mileage.

Does trip cost include tolls and parking?

Only when you enter them. The calculator also has an optional other-trip amount. It does not fetch tolls, parking fees, food, hotels, permits, maintenance, or route-specific charges.

How should I calculate monthly commute cost?

Enter the one-way distance, one-way trips per day, and travel days per month. The result shows monthly distance, fuel, fuel cost, yearly fuel cost, and cost per travel day. Compare the recurring amount with your monthly budget.

How do I measure my actual vehicle mileage?

Record distance driven between two similar fill levels, preferably full tank to full tank, and divide distance by fuel filled. Repeating the measurement across normal driving usually gives a better planning figure than one short trip.

Does better mileage guarantee the shown savings?

No. Savings mode holds distance and fuel price constant to show the mathematical difference. Real distance, prices, traffic, maintenance, driving style, and city versus highway use can change the result.

This calculator provides a travel and fuel planning estimate only. It does not fetch live petrol or diesel prices, calculate a route, verify tolls, inspect a vehicle, estimate maintenance or depreciation, or provide an official travel quote. Check current prices, route conditions, vehicle guidance, and important costs before travelling.Read the full disclaimer.

Last updated: 7 June 2026More Travel calculators