Have you ever tried to compare to products in the store but couldn't because they were different sizes? Sometimes the tag on the shelf helps, but sometimes it doesn't. So, here's a quick reference...
On your calculator (or phone) enter the cost of the item, then divide by the quantity of units (ounces, pounds, square feet, etc).
example: the 4 lb bag of sugar is $2.99, the 5 lb bag of sugar is $3.29 which is cheaper?
2.99/4=$0.74/lb
3.29/5=$0.658/lb
So this time, the 5lb bag is cheaper.
Don't you love math?
Sometimes it's not so simple. Toilet paper is very hard to compare because of ply's and square sizes vary.
Just for reference:
16 oz/lb
128 oz/gallon
a standard loaf of bread has 22 slices a sandwich loaf has 24 slices
4 quarts/gallon
2 pints/quart
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