Miles/Gallon (US) to Gallon (US)/100mi Converter

Fuel Economy Converter

11 units available

Decimals:

From

To

553.259002

1 mpg = 553.259002 gal/100mi

Formula:

gal/100mi = mpg × 553.2590019026

With your value: 1 mpg = 553.2590019 gal/100mi

Other Miles/Gallon (US) to Gallon (US)/100mi conversions

2 mpg to gal/100mi 3 mpg to gal/100mi 4 mpg to gal/100mi 5 mpg to gal/100mi 6 mpg to gal/100mi 7 mpg to gal/100mi 8 mpg to gal/100mi

Miles/Gallon (US) to Gallon (US)/100mi Conversion Table

Miles/Gallon (US) (mpg)	Gallon (US)/100mi (gal/100mi)
0.5	1,106.518004
1	553.259002
2	276.629501
5	110.6518
10	55.3259
15	36.883933
20	27.66295
25	22.13036
50	11.06518
100	5.53259
250	2.213036
500	1.106518
1000	0.553259

Gallon (US)/100mi to Miles/Gallon (US) Conversion Table

Gallon (US)/100mi (gal/100mi)	Miles/Gallon (US) (mpg)
0.5	1,106.518004
1	553.259002
2	276.629501
5	110.6518
10	55.3259
15	36.883933
20	27.66295
25	22.13036
50	11.06518
100	5.53259
250	2.213036
500	1.106518
1000	0.553259

Where these values come from

Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.

Miles/Gallon (US) (mpg)

Fuel Economy

Exact conversion

Composite of a defined volume and a defined length. US and imperial gallons differ, so mpg figures are not interchangeable between them.

Source: NIST Special Publication 811, Guide for the Use of the International System of Units

National Institute of Standards and Technology (US) · Reviewed 2026-07-01

Gallon (US)/100mi (gal/100mi)

Fuel Economy

Exact conversion

Composite of a defined volume and a defined length. US and imperial gallons differ, so mpg figures are not interchangeable between them.

Source: NIST Special Publication 811, Guide for the Use of the International System of Units

National Institute of Standards and Technology (US) · Reviewed 2026-07-01

How to Convert Miles/Gallon (US) to Gallon (US)/100mi

This conversion uses an offset formula, so it cannot be described by a single multiplication factor.

Formula: gal/100mi = mpg × 553.2590019026

Reverse: mpg = gal/100mi × 553.2590019026

Step-by-Step Example

Start with your value in Miles/Gallon (US). For example: 5 mpg
Apply gal/100mi = mpg × 553.2590019026
The result is: 110.6518 gal/100mi

About Miles/Gallon (US)

Miles per gallon (mpg) is the standard measure of fuel economy in the United States.

Common uses: car window stickers, fuel costs, environmental metrics.

About Gallon (US)/100mi

The gallon (us)/100mi (gal/100mi) is a unit of fuel economy. The gallon (us)/100mi scale is offset from the kilometre per litre scale, so converting it requires both a factor and an offset rather than a single multiplier. UnitConvertLab converts it against every other fuel economy unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.

Common uses: fuel economy calculations, engineering and science, education.

Frequently Asked Questions

How many Gallon (US)/100mi are in 1 Miles/Gallon (US)?

There are exactly 553.2590019026 Gallon (US)/100mi in 1 Miles/Gallon (US).

What is the formula to convert Miles/Gallon (US) to Gallon (US)/100mi?

The formula to convert Miles/Gallon (US) to Gallon (US)/100mi is: gal/100mi = mpg × 553.2590019026. For example, to convert 10 Miles/Gallon (US) to Gallon (US)/100mi, you would apply the formula to 10.

What is a Miles/Gallon (US)?