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Fuel Cost Calculator

Fuel Cost Calculator - Trip Gas Estimator

Free fuel cost calculator for 2026. Calculate gas cost for any trip based on distance, MPG or L/100km, and fuel price. Save money on gas.

Trip Details

Lower is better
$

Estimated Trip Cost

$0.00
Fuel Required0.00 Liters
1

How Fuel Cost is Calculated

Fuel cost depends on three primary factors: total distance, your vehicle's fuel efficiency (MPG or L/100km), and the price per unit of fuel (gallon or liter). Driving habits and vehicle load also play a significant role.

2

Formula

We use standard formulas depending on your unit system:

Metric (L/100km)

`Fuel Needed (L) = (Distance / 100) × L/100km` `Cost = Fuel Needed × Price per Liter`

Imperial (MPG)

`Fuel Needed (Gal) = Distance / MPG` `Cost = Fuel Needed × Price per Gallon`

Key Terms

L/100km

Liters per 100 kilometers. A measure of fuel consumption.

Calculate Gas Cost for Your Trip

Planning a road trip or commute? Use our Fuel Cost Calculator to instantly estimate how much you'll spend on gas. By inputting your trip distance, vehicle's fuel efficiency, and the current gas price, you can budget accurately and avoid surprises at the pump.

Fuel Efficiency Conversion

Understanding the difference between US MPG and L/100km:
US MPGL/100kmEfficiency Rating
50 MPG4.7 L/100kmExcellent (Hybrid/EV)
40 MPG5.9 L/100kmVery Good (Compact Car)
30 MPG7.8 L/100kmGood (Average Sedan)
20 MPG11.8 L/100kmFair (SUV/Light Truck)
15 MPG15.7 L/100kmPoor (Heavy Truck/Towing)

Driving Tips for Efficiency

Save up to 25% on fuel with these driving habits. For comprehensive trip planning, also check our trip cost calculator to estimate total travel expenses including accommodation and meals.

Fuel Cost Formulas

We use standard formulas depending on your unit system:

Frequently Asked Questions

Q:How do I calculate gas cost for a trip?

Divide your trip distance by your vehicle's fuel economy (MPG). This gives you the gallons of gas required. Multiply that number by the price of gas per gallon to get your total trip cost. (For metric: Distance / 100 * L/100km * Price).

Q:How accurate is this fuel calculator?

This calculator provides a precise estimate based on your inputs. However, real-world factors like traffic, terrain (hills), vehicle load, and weather (wind) can affect actual fuel consumption by 10-20%.

Q:What is a good MPG?

A 'good' MPG depends on the vehicle class. For a modern sedan, 30+ MPG (highway) is good. For an SUV, 25+ MPG is decent. Hybrids often achieve 50+ MPG.

Q:Does using AC use more gas?

Yes, using air conditioning puts load on the engine and can reduce fuel economy by up to 20%. Opening windows at high speeds also increases drag. The most efficient method is using the fan/vent without AC.

Q:How do I convert MPG to L/100km?

The formula is `235.21 / MPG`. For example, 30 MPG is `235.21 / 30 ≈ 7.8 L/100km`.