Wow, this is going to be tough to figure out since I reuse some chemicals, vary my dilutions, and shoot both 35mm and 120 film. It is CHEAP for me to process my own B&W film though, I can tell you that. So far, I have only screwed up one roll in developing beyond recovery. I was using a lot of a weaker dilution for a while and forgot I had mixed up a regular batch so I essentially ended up developing for twice as long as I should have. Twice I have forgotten to mix up fresh fixer and needed to refix film but, that's no biggie.

My chemicals:

HC-110 is $13.99 - Had about 15 rolls of 35mm and 35 rolls of 120 on my first bottle using dil. H 75% of the time and dil. B the other 25%. I still had a little left in the bottle but, I only mix a quart of working solution at a time and that is straight from concentrate. The little left in the original bottle had started to go bad. I would guess there was about a little under 10% of the bottle left when I switch to a fresh bottle.

Kodak Indicator Stop Bath is $5.99 - I reuse this. I have about 65 rolls on the bottle so far and have only gone through MAYBE 25% of the bottle at most.

Kodafix is $7.49 - Reusing this as well. Just finished my second bottle. 1 bottle of Kodafix makes 4 quarts of working solution IIRC ( I mix everything 1 quart at a time). The first bottle I used single use and that was good for about 12 rolls of 35mm. Now I reuse and just mixed up the last of my second bottle. So far I have about 50 rolls??? on this bottle, about 1/3 35mm and 2/3 120 film.

Hypo Clearing Agent is $3.49 for the 1.25 gallon packets. This make 1 quart of stock solution - Depending on the film, one packet is good for roughly 15 rolls of 35mm or 10 rolls of 120 film.

Kodak Photo Flo 200 is $7.99 - This stuff lasts FOREVER. Doing the math on it 1 bottle makes about roughly 94 quarts of working solution. 1 quart does 3 rolls of 35mm or 2 rolls of 120.

Not sure what that works out to per roll but, it is cheap and worth every penny IMO. Also, thanks to Ebay, I only have $30 into my set-up including storage bottles, beakers, Patterson tank with 2 reels, and a changing bag.

Aaron