---
title: "Fuel Cost Calculator — mpg & L/100km for US, UK, Europe, Australia"
description: "Calculate the fuel cost of any trip. Supports US mpg, UK mpg, and European L/100km fuel efficiency standards. Preset defaults for 8 countries with local currency and fuel prices."
url: "https://worldcalculators.org/calculators/fuel-cost/"
canonical: "https://worldcalculators.org/calculators/fuel-cost/"
---

# Fuel Cost Calculator

Calculate the fuel cost of any trip. Supports US mpg, UK mpg, and European L/100km fuel efficiency standards. Preset defaults for 8 countries with local currency and fuel prices.

## Quick answer

Formula: US mpg: cost = (miles ÷ mpg) × price/US-gallon. UK mpg: cost = (miles ÷ mpg) × 4.546L × price/litre (UK sells fuel by litre). Europe/Australia/Canada: cost = (km ÷ 100) × L/100km × price/litre. US and UK mpg figures are not equivalent — a UK imperial gallon is 4.546L vs US gallon at 3.785L, so a UK 40 mpg car ≈ US 33 mpg.

## US Gallon vs UK Imperial Gallon

This is the most common source of confusion for international car buyers and travellers. The US gallon is 3.785 litres ; the UK imperial gallon is 4.546 litres — about 20% larger. This means a British car advertised at 50 mpg is roughly equivalent to a US car at 41.6 mpg. Always verify which standard a vehicle's fuel economy spec uses.

## Electric Vehicle Equivalent

For EVs, the equivalent metric is kWh per 100km (Europe/Australia) or MPGe (miles per gallon equivalent, USA). A typical EV uses 15–20 kWh/100km. At €0.30/kWh, a 100km trip costs €4.50–6.00 — compared to €12–16 in a petrol car at 8 L/100km and €1.75/L.

Source: https://worldcalculators.org/calculators/fuel-cost/
Markdown mirror of the HTML page. Prefer this URL for RAG; the interactive calculator still lives on the HTML page.