Calculator Comparison

Fuel Economy Converter vs Volume Converter

Not sure which calculator to use? Here's a side-by-side comparison of the Fuel Economy Converter and Volume Converter to help you pick the right one for your needs.

Fuel Economy Converter

Unit Conversions

Convert between fuel economy and efficiency units including miles per gallon (MPG), liters per 100 kilometers, and kilometers per liter.

What you enter

Fuel Economy Value
From Unit

What you get

Miles per Gallon(primary)
Liters per 100 km
Kilometers per Liter

Use Fuel Economy Converter

Volume Converter

Unit Conversions

Convert between common volume units including liters, gallons, cups, milliliters, fluid ounces, and tablespoons.

What you enter

Value
From Unit

What you get

Liters(primary)
Gallons
Cups
Milliliters
Fluid Ounces
Tablespoons

Use Volume Converter

Key Differences

Feature	Fuel Economy Converter	Volume Converter
Category	Unit Conversions	Unit Conversions
Inputs	2 required fields	2 required fields
Outputs	3 results	6 results
Chart	No chart	No chart
FAQs	3 answered	3 answered

Input Comparison

Shared Inputs

From Unit

Only in Fuel Economy Converter

Fuel Economy Value

Only in Volume Converter

Value

Which Calculator Should You Use?

Use the Fuel Economy Converter if you need to:

Calculate miles per gallon
When you know your fuel economy value and from unit

Use the Volume Converter if you need to:

Calculate liters
When you know your value and from unit

Frequently Asked Questions

How do I convert MPG to liters per 100 km?

Divide 235.215 by the MPG value. For example, 25 MPG = 235.215 / 25 = 9.41 L/100km. The relationship is inverse: higher MPG means lower L/100km (better efficiency).

What is considered good fuel economy?

For gasoline cars, 30+ MPG (under 7.8 L/100km) is considered good. Hybrid vehicles typically get 40-60 MPG. The average new car in the US gets about 25-30 MPG combined.

How many cups are in a gallon?

There are 16 cups in a US gallon. A gallon is 128 fluid ounces, and each cup is 8 fluid ounces. For UK Imperial gallons, there are approximately 18.18 US cups.

What is the difference between a US gallon and a UK gallon?

A US gallon is 3.785 liters while a UK (Imperial) gallon is 4.546 liters. The UK gallon is about 20% larger. This calculator uses US measurements.

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Bottom Line

Choose the Fuel Economy Converter if you need to calculate miles per gallon. Use the Volume Converter if you need to calculate liters. Both calculators are free and require no sign-up.

Use Fuel Economy Converter Use Volume Converter

Feature

Fuel Economy Converter

Volume Converter