SuCalc
Everyday Calculators

Fuel Cost Calculator

Updated Aug 24, 2026 Reviewed Aug 24, 2026
Estimate trip fuel and cost using L/100 km, km/L, U.S. MPG, or Imperial MPG with clearly separated gallon definitions.

Trip fuel and cost estimate

Enter distance, vehicle economy, and fuel price

Consumption and economy are inverse measures
L/100 km increases as more fuel is used; km/L and MPG increase as a vehicle travels farther on the same fuel.

Use 2 when the entered distance is one way and the same return distance is required.

Result

Calculation summary

Enter values to see the result

Your result, breakdown, assumptions, and warnings will appear here.

Trip cost preview

Distance to fuel to cost

Live preview
Distance to fuel to costA three-step flow from total route distance to required fuel volume and estimated fuel cost.
Total distance300 km
Fuel required22.5 L
Estimated cost$37.13
All entered units are normalized before fuel volume and total cost are calculated.

Formula

cost = distance km × (L per 100 km ÷ 100) × price per L

Cost per route repetition
$37.13
Equal cost per person
$37.13
Equivalent consumption
7.5 L/100 km

How to use this calculator

  1. 1Enter one-way or route distance and the number of times that distance will be traveled.
  2. 2Enter vehicle consumption or economy in the labeled unit.
  3. 3Enter fuel price per liter, U.S. gallon, or Imperial gallon and optionally divide the cost among people.

Formula

Fuel cost = distance in km × (L/100 km ÷ 100) × price per liter

Distance, fuel economy, and price are normalized to kilometers, liters per 100 kilometers, and price per liter before calculating.

Calculation steps

  • Convert the total traveled distance to kilometers.
  • Normalize the entered economy to liters per 100 kilometers.
  • Multiply distance by normalized consumption to find liters required.
  • Normalize fuel price to price per liter and multiply by fuel required.

Worked example

A 300 km trip at 7.5 L/100 km uses 22.5 liters. At 1.65 per liter, the estimated fuel cost is 37.125 before display rounding.

Assumptions

  • U.S. MPG uses the U.S. liquid gallon; Imperial MPG uses the 4.54609-liter Imperial gallon.
  • The entered efficiency applies to the entire route and every repeated trip.
  • Idling, detours, traffic, weather, driving style, load, and price changes are not modeled.
  • Passenger cost is an equal division of fuel cost only.

Sources

Frequently asked questions

What is the difference between U.S. MPG and Imperial MPG?

They use different gallon sizes. The calculator keeps them separate and labels each result.

Should a round trip be entered twice?

Either enter the complete route distance once or enter the one-way distance and set the trip count accordingly.

Why can actual fuel use differ?

Published or entered economy is an estimate; driving, traffic, weather, load, and route conditions affect actual use.

Does the calculator fetch local fuel prices?

No. It uses only the price and price unit you enter.

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