Useful numbers to memorize@Everything2.com

one year = 3e7 seconds - useful for those "if everyone on Earth did ~ one time every second" ideas
1 meter per second = 2.16 mph - this is useful for estimating speeds by sight.
one hour = 3600 seconds
one mile = 1.6 km (and one km = 0.6 miles - see golden ratio
speed of light in a vacuum = 3e8 m/s
one mile = 5280 feet
one square mile = 640 acres
one acre is ~ 209 feet on a side
one ounce = 28 grams
one kilogram = 2.2 pounds
(1 + 1/n)^n approaches e as n goes to infinity. So the sequence 1.5², 1.25⁴, 1.1¹⁰, 1.05²⁰ etc goes to e.
1 mb of mp3 = 1 minute of sound at 128 kbps

Golden ratio	All I ever needed to know about unit conversion, I learned from drugs	Infinite expected value	gomi no sensei
Getting your oil checked, or acute adolescent Appalachian homosexuality	English units / Metric conversion factors	Bingbang Babbaloo Battles Burpers	Quick unit conversion
mile	infinity	CPUID	The Birth of Conversion
Unit Conversion	Gravity	second	Russia
e	Currency of the World	Star Island	Unit conversion formulae
Everything Kitchen Conversion Table	Volume Conversion Factors	Area Conversion Units	Conversion Table

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