Weights and Measures

Dave's Math Tables: Weights and Measures

Unit Conversion Tables for Areas

The notation 1.23E + 4 stands for 1.23 x 10⁺⁴ = 0.000123.

_from \ ^to = __ acres = __ feet² = __ inches² = __ meters² = __ miles² = __ yards²

acre 43560 6272640 4046.856... (1/640) 4840

foot² (1/43560) 144 0.09290304 (1/27878400) (1/9)

inch² (1/6272640) (1/144) 6.4516E - 4 3.587006E - 10 (1/1296)

meter² 2.471054...E - 4 10.76391... 1550.0031 3.861021...E - 7 1.195990...

mile² 640 27878400 2.78784E + 9 2.589988...E + 6 3097600

yard² (1/4840) 9 1296 0.83612736 3.228305...E - 7

To use: Find the unit to convert from in the left column, and multiply it by the expression under the unit to convert to.
Examples: foot² = 144 inches²; 2 feet² = 2x144 inches².

Useful Exact Area & Length Relationships

acre = (1/640) miles²
mile = 1760 yards = 5280 feet
yard = 3 feet = 36 inches
foot = 12 inches
inch = 2.54 centimeters

Note that when converting area units:
1 foot = 12 inches
(1 foot)² = (12 inches)² (square both sides)
1 foot² = 144 inches²
The linear & area relationships are not the same!

_from \ ^to	= __ acres	= __ feet²	= __ inches²	= __ meters²	= __ miles²	= __ yards²
acre		43560	6272640	4046.856...	(1/640)	4840
foot²	(1/43560)		144	0.09290304	(1/27878400)	(1/9)
inch²	(1/6272640)	(1/144)		6.4516E - 4	3.587006E - 10	(1/1296)
meter²	2.471054...E - 4	10.76391...	1550.0031		3.861021...E - 7	1.195990...
mile²	640	27878400	2.78784E + 9	2.589988...E + 6		3097600
yard²	(1/4840)	9	1296	0.83612736	3.228305...E - 7