Sample-and-Scale Counter: Crowds, Jars, Books and Trees

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Opens on Chapter 14’s example: Main Street at the Cedar Bend street fair, 1,200 by 60 feet.

A crowd

Length (ft)

Width (ft)

Over the day

People at a time

Hours open

Hours each stays

Scale up from a sample

Counted in the sample

Samples in the whole

Other sample counts (for a range)

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Enter your numbers, then press Calculate.

From the book, Chapter 14. Main Street is 72,000 square feet: 7,200 people in a loose crowd at 10 square feet each, 16,000 dense at 4.5, 28,800 packed at 2.5 (reporters’ rules of thumb). About 7,000 at a time, staying 1.5 hours over 8, turn over 5.3 times: about 37,333 visits. A gallon jar of 64 quarter cups at 40 beans each is 2,560. 11 × 32 × 320 = 112,640 words. A 40-acre park is 174 squares of 100 feet; at 7 trees a square, about 1,220 (from 871 to 1,568).

Rounding is half up, the way the book rounds. Numbers can be typed as 1,450, $38, 12%, 1/20, 2.5 million or 3 × 10⁷. Everything stays in your browser: no sign-up, nothing stored or sent.