This calculator gives you a basic overview of what you should pay for a flip based on the repairs needed and the ARV (after repaired value).
The calculator is based on the 70 percent rule, which is very close to what I pay for most of my flips. I can actually pay a little more, because I am an agent and save money on commissions.
This is a basic calculator, I would always suggest writing all the numbers out when you are looking at a flip. For more information and instruction on flipping, check out my fix and flip video training course.