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NumLuma› Conversions›Fuel Economy
Conversions · calculator Unit Conversion Calculators ↗

Fuel Economy Converter

Convert vehicle fuel economy between US MPG, kilometers per liter and liters per 100 kilometers.

FreeNo sign-upInstant resultFormula shownInputs stay in your browser
Interactive calculatorEnter your values
Recalculates as you type
Converted fuel economy Live result
Enter your values
Calculation breakdown
How to read this result

Use the result to compare scenarios and verify the inputs, units and real-world conditions before making an important decision.

More actions
Useful next calculationLength
How to use it

A clear result in a few inputs.

  1. Enter the requested values.Use consistent units and the real values for your scenario.
  2. Read the main result and breakdown.NumLuma recalculates immediately when an input changes.
  3. Check the formula and assumptions.Use the supporting context before making a real-world decision.

What this calculator does

Convert vehicle fuel economy between US MPG, kilometers per liter and liters per 100 kilometers.

When to double-check the result

This tool is designed for planning, comparison and estimation. Taxes, local codes, professional standards, lender rules, product specifications and real-world measurements can change the final answer. For decisions where an error could have an important financial, legal, health or safety consequence, verify the result with an appropriate qualified source.

NLNumLuma standard

Built to be understandable before it is impressive.

  • Formula shown clearly
  • No sign-up required
  • Mobile-first controls
  • Inputs processed locally
  • Plain-language result breakdown
Read our methodology →
Reference standards

Sources used for context.

These links support the measurement standard or scope around this calculation. NumLuma still shows its own formula so the math remains inspectable.

The International System of Units (SI), 9th editionBIPM

Primary international reference for SI units and unit relationships.

External reference ↗
Assumptions & scope

Know what the number includes.

Conversion utility. Accuracy, unit definitions and fast UX matter more than long-form copy.

How NumLuma checks calculators →
Part of a curated toolkit

Unit Conversion Calculators

Best for measurements, specifications, travel and international unit comparisons.

Explore the toolkit →
Quick answers

About the fuel economy calculation.

How is the fuel economy result calculated?

US MPG, km/L and L/100km are converted using 1 US gallon = 3.785411784 L and 1 mile = 1.609344 km.. The calculator updates this relationship instantly when you change an input.

What does the result mean?

The primary output is converted fuel economy. 30 US MPG is about 7.84 L/100km.

What should I verify before using the result?

Conversion factors are standardized, but product labels, local conventions and rounding rules can differ.

Is this calculator free and private?

Yes. It works without an account, and the entered values are processed locally in your browser for this calculation.