The general formula to calculate the volume (ml) to be given to the patient per dose is:

$$Vol (ml) = \text{dose} \times \text{wt} \times \frac{1}{\text{conc}}$$

The same formula can be used for continuous infusion calculations; if you want to calculate the total volume to be given in 24 hrs., you will multiply by 24 if the dose is expressed by (per hr) or multiply by 24×60 if the dose is expressed by (per minute)

To calculate the final volume (the appropriate concentration od administration) you should use the same formula, and instead of using the concentration of the available solution, you should use the final desired concentration you wish to achieve.