Conversion formula

The conversion factor from fluid ounces to milliliters is 29.5735296875, which means that 1 fluid ounce is equal to 29.5735296875 milliliters:

1 fl oz = 29.5735296875 ml

To convert 21 fluid ounces into milliliters we have to multiply 21 by the conversion factor in order to get the volume amount from fluid ounces to milliliters. We can also form a simple proportion to calculate the result:

1 fl oz → 29.5735296875 ml

21 fl oz → V_(ml)

Solve the above proportion to obtain the volume V in milliliters:

V_(ml) = 21 fl oz × 29.5735296875 ml

V_(ml) = 621.0441234375 ml

The final result is:

21 fl oz → 621.0441234375 ml

We conclude that 21 fluid ounces is equivalent to 621.0441234375 milliliters:

21 fluid ounces = 621.0441234375 milliliters

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 milliliter is equal to 0.0016101915504247 × 21 fluid ounces.

Another way is saying that 21 fluid ounces is equal to 1 ÷ 0.0016101915504247 milliliters.

Approximate result

For practical purposes we can round our final result to an approximate numerical value. We can say that twenty-one fluid ounces is approximately six hundred twenty-one point zero four four milliliters:

21 fl oz ≅ 621.044 ml

An alternative is also that one milliliter is approximately zero point zero zero two times twenty-one fluid ounces.

Conversion table

fluid ounces to milliliters chart

For quick reference purposes, below is the conversion table you can use to convert from fluid ounces to milliliters