Need a quote system designed for providing a quotes (Vlookup)

We have a basic Xcel spreadsheet for calculating potential quotes for clients but it's not very efficient at the moment we still need read off a chart.

Basically we want a fast/quick calculation where we put in the measurement in both inches and cm and it will provide us with an overall quote for 2 options 1) no overpaint 2) with overpaint

Of course other costs need to be factored in to the calculation but I can go through this with you.