Potting Soil Math
So, I was in Menards the other day and found an 8-quart bag of potting soil on sale for $4.88. That sounded like a good deal. But then I found I could get the same brand and potting soil mix for regular price of $10.99 for a 2 cubic foot bag.
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Why are the smaller bags measured in quarts, but the larger bags are measured in cubic feet? Seems like they don't want you know something about the price comparison.

I'm an old guy, but it sure seemed to me that the larger bag of potting soil at the everyday regular price was probably a better deal than the smaller bag of potting soil on sale. So, I bought the larger bag. Well, I suspected it was a better price per unit, and I needed more than one small bag for my planned seed starts.

Back at home, I used my computer to ask MS Copilot AI to compare the different quantities and prices of those bags of potting soil and give me price per common unit so I could see the real cost. I mean, why not let AI do all the work for you? As I suspected, the larger bag at the regular price was a much better deal than the smaller bag even on sale.
For those who are interested in the math, here is the response I got from the AI query..
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To compare the price per unit for both bags, we need to convert the volume measurements into the same unit. Let's use
cubic feet (ft³), as the larger bag is already measured that way.
Conversions:
- 1 cubic foot = 25.71 quarts (approximate conversion factor).
Calculations:
- Small Bag:
- Volume: 8 quarts ÷ 25.71 quarts per cubic foot ≈ 0.311 ft³.
- Price per cubic foot: $4.88 ÷ 0.311 ft³ ≈ $15.69 per cubic foot.
- Large Bag:
- Volume: 2 cubic feet (no conversion needed).
- Price per cubic foot: $10.99 ÷ 2 ft³ ≈ $5.50 per cubic foot.
Comparison:
- Small Bag: $15.69 per cubic foot.
- Large Bag: $5.50 per cubic foot.
The larger bag offers significantly better value for your money. Let me know if you'd like me to help with any other comparisons!