AREA(FACE FOOT)=Length X Width(Height)
DEPTH IN FEET=Depth in inches divided by 12
CUBIC FEET REQUIRED=Length X Width(Height) X Depth
CUBIC YARDS REQUIRED=Cubic feet divided by 27
CIRCLE AREA=3.14 X Radius Squared
CIRCLE CIRCUMFERENCE=3.14 X Diameter
TRIANGLE AREA=1/2 of Base x Height

***One Cubic Yard = 27 Cubic Feet
***One Ton = 2000 pounds
***One Ton of Construction Aggregate = 3/4 of a cubic yard

TONNAGE REQUIRED=Cubic Feet X Pounds per Cubic Foot divided 
by 2000

APPROXIMATE WEIGHTS PER CUBIC FOOT:
***Michigan Granite Boulders:170 pounds per cubic foot
***Michigan Limestone:155 pounds per cubic foot
***Canadian Limestone:165 pounds per cubic foot
***Michigan Grindstone:136 pounds per cubic foot

MICHIGAN BOULDER COVERAGE:

SIZE

APPROXIMATE
WEIGHTS

APPROXIMATE 
FACE FEET PER TON

4"-8"

20-60lbs.

30-50

4"-12"

20-100lbs.

18-19

8"-18"

100-200lbs.

15-16

12"-24"

125-250lbs.

13-14

18"-30"

205-530lbs.

11-12

24"-36"

250-1100lbs.

9-10

30"-42"

530-2000lbs.

7-8

36"-48"

1100-2800lbs.

6-7

APPROXIMATE BOULDER WEIGHTS:

SIZE

WEIGHT

12"

100lbs.

14"

125lbs.

18"

205lbs.

24"

253lbs.

30"

530lbs.

36"

1100lbs.

48"

2800lbs.

***One cubic yard of 4"-12" oversize cobblestone 
weighs approximately 3,200 pounds.