Well, if you have a pint and a half for an acre, mixed into
100 gallons of water, that is 24 US fluid ounces in 100 gallons
of water, or .24 fluid ounces per gallon, or about 1/2 tablespoon
of liquid concentrate per gallon, spread over 100th of an acre.
An acre is 43560 square feet, so 100th of that would be 435.6
square feet. A 20 by 20 foot space would be 400 square feet.
So figure 1/2 tablespoon in a gallon sprayed over a 20 foot by
20 foot space, plus another 5 foot by 7 foot space, if the
recommendation was to use 1.5 pints per acre.
I usually run a tape measure down beside a garden space in
two directions to get a rectangular area measure, like "10'x20'
for 200 square feet", and I ignore any "missing" areas in there
that do not have a plant, or some other kind of plant, a patch
of lawn, and so on. For convenience, I assume that the "extra"
space makes up for overspray that misses the plants and
garden entirely, gets picked up by a breeze and ends up on
nearby trees or shrubs, and so on. Rough measures are
usually good enough here, and all areas are rectangular for
the purposes of estimating how much stuff to use, even if
their actual shapes look like a map of the holes on a golf
course.
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