Liters per Kilometer Calculator

April 23, 2025

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Calculate liters kilometers of fuel efficiency (L/100km, km/L, MPG US), distance traveled, or fuel used given the other two values. Supports metric and imperial units.

Fuel Efficiency & Consumption Calculator

Calculate fuel efficiency, distance, or fuel usage. Enter values and select units for any **two** fields below to compute the missing one.

Note: MPG calculations use the **US Gallon** (approx. 3.785 liters).

Enter Known Values

Distance:

Fuel Used:

Fuel Efficiency:

Enter L/100km, km/L, or Miles Per US Gallon.

Understanding Fuel Efficiency Metrics

Fuel efficiency (or fuel consumption) measures how much fuel a vehicle uses to travel a certain distance. Common metrics include:

L/100km (Liters per 100 Kilometers): Common in metric countries (like Egypt). Lower numbers mean better efficiency (less fuel used to travel 100 km).
km/L (Kilometers per Liter): The inverse of L/100km (related by $km/L = 100 / (L/100km)$). Higher numbers mean better efficiency (more distance per liter).
MPG (Miles Per Gallon): Common in the US and UK. Higher numbers mean better efficiency (more distance per gallon). **This calculator uses the US Gallon** (1 US gal ≈ 3.785 L). Note: The UK uses the larger Imperial Gallon (≈ 4.546 L).

The Relationship

These three values – Distance (d), Fuel Used (f), and Fuel Efficiency (e) – are interconnected. Knowing any two allows you to calculate the third. For example:

If efficiency is in km/L: $d = f \times e$
If efficiency is in L/100km: $f = (d / 100) \times e$
If efficiency is in MPG: $d (\text{mi}) = f (\text{gal}) \times e (\text{MPG})$

This calculator handles the necessary unit conversions between km/miles, Liters/US Gallons, and the different efficiency metrics automatically.

Use Cases:

Comparing the fuel economy of different vehicles using various metrics.
Estimating the amount of fuel needed for a planned trip based on distance and expected efficiency.
Calculating the total distance you can travel on a specific amount of fuel (e.g., a full tank).
Calculating your actual fuel consumption (L/100km or MPG) after a trip by tracking distance covered and fuel used.
Budgeting for fuel costs.

Frequently Asked Questions (FAQs)

How do I use this calculator?

Enter known values (and select their correct units) into exactly **two** of the three fields: Distance, Fuel Used, or Fuel Efficiency. Leave the field you want to calculate blank, select its desired output unit, and click "Calculate".

What's the difference between L/100km and km/L?

They measure the same thing (efficiency) but inversely. L/100km tells you fuel used per fixed distance (lower is better). km/L tells you distance covered per fixed fuel amount (higher is better). They are related by $km/L = 100 / (L/100km)$.

Which MPG does this use (US or Imperial)?

This calculator uses the **US Gallon** (approximately 3.785 liters) for MPG calculations. The Imperial Gallon used in the UK is larger (approximately 4.546 liters), so UK MPG figures are typically higher than US MPG figures for the same vehicle.

What factors affect real-world fuel efficiency?

Official ratings are based on standardized tests. Your actual fuel efficiency can vary significantly due to driving style (acceleration, braking), speed, terrain (hills), vehicle maintenance (tire pressure, engine condition), use of air conditioning, vehicle load, and weather conditions.

How can I calculate my actual L/100km or MPG?

Fill your tank completely and reset your trip meter. Drive normally until the tank is partially or nearly empty. Refill the tank completely again and note the exact amount of fuel added (in Liters or Gallons). Record the distance traveled on your trip meter (in km or miles). Enter the Distance and Fuel Used into this calculator, leave Efficiency blank, select your desired output unit (L/100km or MPG), and click Calculate.