In the Offers section of your Seller Leads app, you will find 2 calculation fields:
Suggested Buy Price
Max Allowable Offer
The calculation for them (as you can see in the image below) is 50% of (ARV - Repair Estimate) for "Suggested Buy Price" and 75% of (ARV - Repair Estimate) for "Max Allowable Offer".
ARV, Living Area (Sq.Ft) and Comparables are 3 auto-populating fields (they will auto-populate from Zillow if the property is found over there).