How to see which is the best deal?

Strictlytaylor

I am at the end of a two year fixed rate deal and struggling to assess which is the best new deal to go for.  The two key variables that I want are 1) The total of the payments over the period (typically amount x 24 monthly payments and 2) the remaining balance at the end of the 24 months.    Am I right about this? 
It doesn't seem to me to be enough just to add up the total payments + charges in order to evaluate the best deal? Could it be the case for example, that a higher mortgage charge  with a lower interest rate, applied to a smaller loan amount will be generally less of a good deal than for a higher loan amount?  Does this make sense?   Does anyone know of a good calculator that can help work this out?  Do I need to go back to school?
Many thanks

foxy-stoat

https://www.moneysavingexpert.com/mortgages/mortgage-rate-calculator/

Try that.