Rules of Thumb

150_rulesofthumbTom Parker has published several books on “rules of thumb” over the past 25 years, and has collected even more information, which he’s turned into a collective website.
A rule of thumb turns information you have into information you need. The goal of this website is to gather every rule of thumb on earth into one gargantuan, easily searchable online reference database that will be accessible from anywhere in the world and continue to grow forever.

Some featured rules cover how to choose a lawyer, the safe stopping distance at traffic lights, caring for your car, and winning at blackjack. There are 151 categories of rules so far! You can submit yours, too. Link -Thanks, Tom!

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OK, well I love this site. There are tons of real rules like these: "To estimate the temperature outdoors in degrees Fahrenheit, count the number of times a lone cricket chirps in 15 seconds and add 37."

I've been entering some of my own rules and they might appear in his next book. Could be fun!
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