I've got an aquarium that's 12 7/8" x 21 1/2" x 14 3/16". How many gallons of water will I need to fill it to 2" from the top? How many pounds will it weigh? I want to know if my six-year-old will be able to lift it.

I have a 11' 3 1/2" x 12" trench that's 14" deep. I want to put a retaining wall there. How many cubic yards of crushed stone will I need to fill it to a 4" depth?

I have 1.13 acres of land (hundredths of acres? since when is the acre metric?). My True Green guy is quoting me per square foot for the weed-n-feed program. How do I know that the total price is not BS? Did he subtract the square footage of the house?

I'm at the salad bar. It's priced per ounce. The scale at the register shows that I have 0.91 pounds of salad on the plate. How much do I owe? Am I sure that the cashier has the right conversion factor? Do I even know of the conversion factor?

I'm looking at European chocolate. It's labeled as 10.8oz. The shelf label helpfully gives me the price per pound. How do I compare it to the mighty Hershey's 1/2-pounder that's listed on someone else's shelf whith a per-ounce price?

Real world ponderings, folks. Impossible in Fred Flinstone Units w/out a calculator. Done in your head in seconds using Metric.

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