Question

How do you convert 5L 850 mL

Answer 1

I am assuming that you are trying to convert into mL

Multiply 5 by 1000 and add 850
= 5850 mL

If you are trying to convert into liters
Divide 5850 by 1000
= 5.85 L

If this is what you aren't looking for, please indicate which unit you are trying to convert