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Durkin Tactical Franklin Armory
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Posted: 3/20/2010 9:42:20 AM EDT
I'm revamping my budget and trying to calculate how long a 35lbs bag of Natura; Choice Chicken & Oatmeal dry kibble will last my GSD.

Like I said, the bag is 35lbs. I feed her four cups a day.

Is it possible to calculate this since I don't know the weight of one cup of food?

Link Posted: 3/20/2010 9:44:04 AM EDT
You're trying to divide a weight by a volume. You'd need two volumes or two weights to get a good approximation.
Link Posted: 3/20/2010 9:44:14 AM EDT
Only if you could accurately calculate the total area in cubic feet/inches of the food in a 35lb bag.

The alternative would be to sit there with a measuring cup and keep scooping until you run out of the bag, keeping track of how many cups you pulled out of it.
Link Posted: 3/20/2010 9:44:28 AM EDT

Link Posted: 3/20/2010 9:44:52 AM EDT
I would think you need to weigh out a pound worth of food, see how many cups in a pound, then multiply it by 35.
Link Posted: 3/20/2010 9:45:53 AM EDT
Good luck OP, quite an endeavor your on....
Link Posted: 3/20/2010 9:46:42 AM EDT
About 80
Link Posted: 3/20/2010 9:47:09 AM EDT
Link Posted: 3/20/2010 9:47:35 AM EDT
Weigh one cup of food then divide 35 pounds by that weight?

If you scoop and weigh a half dozen times to get an average weight, you might be a little more accurate.
Link Posted: 3/20/2010 9:47:42 AM EDT
Find a large container, weigh it empty

Dump one cup into container and note the difference.  

Now dump the rest of the bag and note the difference from the weight of the empty container.

Divide the full bag by the weight of the cup = amount of cups in the bag.
Link Posted: 3/20/2010 9:48:00 AM EDT
186 cups in a 35lb bag of Royal Canin Boxer formula. It has large kibbles, not sure how much of an effect that has.
Link Posted: 3/20/2010 9:49:03 AM EDT
Weigh one cup of food then divide 35 pounds by that weight?

If you scoop and weigh a half dozen times to get an average weight, you might be a little more accurate.

this should work but I'm no brain scientist
Link Posted: 3/20/2010 9:53:35 AM EDT
Fuzzy math.
Roughly 160 cups or about 40 days food at 4 cups a day.
That's generous, depends on the density of the dry good.

I'd be willing to bet that the manufactuer has calculated the size of the bag vs. their recommended diet to approximate a thirty day ration.
Link Posted: 3/20/2010 10:09:05 AM EDT
why don't you just take a sheet of paper and every time you feed you Dog you mark it on said paper and once the bag is empty you have the exact count of how many cups are in a 35 lb bag. I think this would be the easiest way to do it rather than get all technical and mathematically to figure it out. It seems to be an easy way ok it will take you a few days or so but this way you get the exact count.
Link Posted: 3/20/2010 10:13:03 AM EDT
Weigh a cup in ounces and then find the total ounces in 35 pounds.
Link Posted: 3/20/2010 10:14:59 AM EDT
Then subtract how much is actually shit and how much is meat.
Link Posted: 3/20/2010 10:31:37 AM EDT
Drive to the pet food store with the bag of dog food.  

Rip it open and dump it all over the floor.

Scream at the top of your lungs "You fuckers better put this into cups and tell me how many there were.  Call me when you're done."

Hand your business card to the nearest person as you turn and walk out the door.
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