Autofill data with value where row and column intersect after user enters data

[trubio77]

Hello,

Need some assistance with attached worksheet.
At the top of the worksheet we have (3) main boxes "Miles", "Weight", and "LN charge".
We need the "LN charge" box to autofill with value of where Miles & Weight intersect after user enters data in the "miles" & "weight" boxes

We also need this to be in VBA macro

Thank you