There are no secret formulas.

Could someone inform me the formula to figure out the average for a rehab for a flooded home?

They're often interesting and sometimes pretty deep for their brevity, but ultimately they are as forgettable as a Justin Timberlake song.

I am trying to understand the numbers a bit better and I do better by plugging in formulas and seeing the numbers change.I am especially interested in: -the layout of your pro forma-the percentage you estimate in vacancy, repair/maint., cap ex, misc-rough estimate for utilities etcI know every market is different but thats why I am asking.

Does anyone know the right "formula"?

Just starting out, I would love to have some answers or formulas for this questions.

Your local tax office will give you the formula that they use.

There are two ways to do it.If you are looking to buy as a primary residence, you base the value on the comps with any adjustments for condition and amenities.If you are buying to flip, you use the flip formula: ARV - profit margin - rehab costs - closing costs - finance carrying costs = maximum possible offer.If a seller is holding out for price, a low offer without contingencies doesn't mean very much to them.

Just completed my profile and will be reading as much info on the forums as I can.I am looking to gain knowledge and discover the formula for making money and providing safe and affordable housing.I have very thick skin and will take advice well. 

I understand there are different formula's that work for commercial, big MF and so on, so for example in this case I would like to determine what I would like to use to ascertain value in SF flips and small MF (less than 6 units).