First of all, in most cases, you don’t give only dextrose to the patient.

In this app, Dextrose Calc, I think the developer assumes you want to know the final concentration of the solution after adding another, dextrose free, solution, auch as normal saline. This is not directly related to the GIR calculation.

You can try our calculator here:

https://samraph.com/glucose-infusion-rate-gir/

It’s more simple and straightforward.

Here is an example of patient weights 5 kg, needs GIR of 5 mg/kg/min and the volume of solution available to administer that GIR is 120 ml (or 5 ml/hr)