Mileage Calculator

Calculate your vehicle fuel efficiency (MPG, L/100km, km/L) and trip fuel costs.

Mileage Calculator Options
Result Details
Enter parameters and click Calculate to view.
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Efficiency Tool

Mileage Calculator

Measure your vehicle's fuel efficiency and estimate trip budgets.

100% Free & Local
STEP 01

Distance Traveled

Enter the total distance driven since your last fuel fill-up, in either miles or kilometers.

STEP 02

Fuel Quantity

Input the total volume of fuel added to the tank (in gallons or liters).

STEP 03

Price per Unit

Optionally enter the price of fuel per gallon or liter to compute your total trip cost.

STEP 04

Check Economy

Click Calculate to output your vehicle's fuel efficiency across multiple unit standards.

Your Privacy Matters

All calculations run locally in your browser.

No Server Uploads

No variables or results are sent to our servers.

Auto-Cleared

Your session data is erased upon closing the tab.

Capabilities

Key Capabilities

Complete Features

Dual Unit Support

Allows standard US (MPG/Gallons) and Metric (km/Liters) configurations in parallel.

Trip Budgeting Calculator

Computes the total spending amount based on local fuel pricing averages.

Three-in-One Outputs

Renders fuel efficiency results in MPG, L/100km, and km/L simultaneously.

Vehicle Performance Logger

Tracks history over multiple fills to analyze driving patterns and fuel degradation.

Confidential Logs

Your vehicle mileage numbers and travel logs are not collected on databases.

Help

Common Questions Answered

Support
Q1 How is L/100km mathematically calculated?
Liters per 100 Kilometers is computed as: (Liters used / (Kilometers traveled / 100)). It represents the fuel required to drive 100 kilometers.
Q2 Why does my calculated MPG differ from my car dashboard display?
Car computer readouts estimate values based on direct injection pulses, whereas manual fill math represents exact fuel consumed.
Q3 How can I calculate fuel economy accurately?
Fill your tank completely, reset the trip odometer, drive until you need fuel, fill the tank completely again, and note the gallons added and miles driven.
Q4 Does fuel grade (Premium vs. Regular) affect mileage?
Unless your engine is designed for high octane, using premium fuel does not improve fuel mileage.
Q5 Will this calculator work for hybrid vehicles?
Yes. It calculates total distance per unit of fuel consumed regardless of vehicle hybrid batteries.