21 milliliters in US gallons

Result

The conversion result is: 21 milliliters is equivalent to 0.00554761309952112 US gallons.[1]

Conversion formula
How to convert 21 milliliters to US gallons?

We know (by definition) that: 1 ml ≈ 0.000264172052358148 usgallon.

We can set up a proportion to solve for the number of US gallons.

1 ml / 21 ml ≈ 0.000264172052358148 usgallon / x usgallon

Now, we cross multiply to solve for our unknown x:

x usgallon ≈ (21 ml / 1 ml) * 0.000264172052358148 usgallon → x usgallon ≈ 0.005547613099521108 usgallon

Conclusion:

21 ml ≈ 0.005547613099521108 usgallon

Conversion in the opposite direction

The inverse of the conversion factor is that 1 US gallon is equal to 180.257704 times 21 milliliters.

It can also be expressed as: 21 milliliters is equal to 1 / 180.257704 US gallons.

Approximation

An approximate numerical result would be: twenty-one milliliters is about zero point zero one US gallons, or alternatively, a US gallon is about one hundred and eighty point two five times twenty-one milliliters.

Footnotes

[1] The precision is 15 significant digits (fourteen digits to the right of the decimal point).

Results may contain small errors due to the use of floating point arithmetic.