Units of Measure

Basic Units of Length
12 inches 1 foot
3 feet 1 yard
1760 yards 1 statute mile
5280 feet 1 statute mile

 

Basic units of Area
144 sq. in. 1 sq. ft.
1296 sq. in. 1 sq. yd.
9 sq. feet 1 sq. yd.
43560 sq. ft. 1 acre
4840 sq. yd. 1 acre
640 acres 1 sq. mile

 

 

Area: Acres to sq. feet
Acre Fraction Acre Decimal Square Feet
1/100 .01 435
1/10 .1 4,356
1/4 .25 10,890
1/2 .50 21,780
3/4 .75 32,670
1 1.0 43,560

 

 

Basic units of cubic measure
1,728 cu. in. 1 cu. foot
27 cu. ft. 1 cu. yard

 

 

Decimal fractions for inches - as a part of 1 foot
  0" 1/4" 1/2" 3/4"
1" .083 .021 .042 .063
2" .167 .188 .208 .229
3" .250 .271 .292 .313
4" .333 .354 .375 .396
5" .417 .438 .458 .479
6" .500 .521 .542 .563
7" .583 .604 .625 .646
8" .667 .688 .708 .729
9" .750 .771 .792 .813
10" .833 .854 .875 .896
11" .918 .938 .958 .979
Some formulas require using inches in their decimal fraction.
Fractions for whole inches are found under column 0".
When determining decimal fraction reading for whole inches plus a fractional part -
Find the point where the whole inch reading, intersects with the fractional reading.
Example: 1" = .083, 5 1/2" = .458