Contractor Corner

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Click here to access Unilock’s Paver Calculator

 

Granite Boulders Approximate Weight Chart

Size Weight in Pounds
4-8″ 25
8-12″ 80
12-18″ 130
18-24″ 500

 

Natural Stone Calculations

Material Weight of Lbs per Cubic Foot
Wisconsin Limestone
                outcropping, 8″ cut drywall, flagstone, and most other natural stone 0.165
Wisconsin Sandstone
                sandy creek, highland brown 0.150
Wisconsin Granite Boulders 0.180
Aqua Blue Boulders 0.200

 

To calculate weight of a piece of stone

For anything Square or Rectangular:
Length x width x height (in inches) ÷ 1.728 x (weight of pounds per cubic foot) = lbs per stone

For anything Circular

To calculate weight of each piece of stone:
Length x width x height (in inches) ÷ 1.728 x (weight of lbs per cubic foot) / 4 x 3.1416 = lbs per stone

 

Calculating Areas and Circumference

Calculate Area Of a Circle

Area = Π x Radius2
Π = 3.1415Calculate Circumference Of a Circle
2 x Π x Radius
Calculate Area Of a Parallelogram

Area = Base x Height
Calculate Area of a Triangle

Area = Base x Height / 2
Calculate Area Of a Trapezium

Area = 1/2 x (B1+B2) x Height

 

Bluestone Reference Chart

size SQ FT size SQ FT
12×12 1 24×24 4
12×18 1.5 24×30 5
12×24 2 24×36 6
12×30 2.5 24×42 7
12×36 3 24×48 8
18×18 2.25 30×30 6.25
18×24 3 30×36 7.5
18×30 3.75 30×42 8.75
18×36 4.5 30×48 10
18×42 5.25 36×36 9
18×48 6 36×48 12

 

Mulch and Topsoil Calculations

Step 1: Length x Width = Area in Square Feet
Step 2: Total Square Feet x # of inches deep ÷ 324 = yards of Mulch/Topsoil Needed

 

Quick Reference Chart for Mulch and Topsoil (Cubic Yards)

Square Feet 2″ 4″ 6″ 8″ 12″
100 0.6 1.2 1.9 2.5 3.7
200 1.2 2.5 3.7 4.9 7.4
300 1.9 3.7 5.6 7.4 11.1
400 2.5 4.9 7.4 9.9 14.8
500 3.1 6.2 9.3 12.3 18.5
600 3.7 7.4 11.1 14.8 22.2
700 4.3 8.6 13.0 17.3 25.9
800 4.9 9.9 14.8 19.8 29.6
900 5.6 11.1 16.7 22.2 33.3
1000 6.2 12.3 18.5 24.7 37.0

 

Base Materials Chart (Cubic Yard)

Bedding Course
Square Feet 1″ 2″ 3″ 4″ 5″ 6″ 7″ 8″ 9″ 10″ 11″ 12″
50 0.3 0.3 0.5 0.6 0.8 0.5 1.1 1.2 1.4 1.5 1.7 1.9
100 0.3 0.6 0.9 1.2 1.5 1.9 2.2 2.5 2.8 3.1 3.4 3.7
150 0.5 0.9 1.4 1.9 2.3 2.8 3.2 3.7 4.2 4.6 5.1 5.6
200 0.6 1.2 1.9 2.5 3.1 3.7 4.3 4.9 5.6 6.2 6.8 7.4
250 0.8 1.5 2.3 3.1 3.9 4.6 5.4 6.2 6.9 7.7 8.5 9.3
300 0.9 1.9 2.8 3.7 4.6 5.6 6.5 7.4 8.3 9.3 10.2 11.1
350 1.1 2.2 3.2 4.6 5.4 6.5 7.6 8.6 9.7 10.8 11.9 13.0
400 1.2 2.5 3.7 4.9 6.2 7.4 7.6 9.9 11.1 12.3 13.6 14.8
450 1.4 2.8 4.2 5.6 6.9 8.3 9.7 11.1 12.5 13.9 15.3 16.7
500 1.5 3.1 4.6 6.2 7.7 9.3 10.8 12.3 13.9 15.4 17.0 18.5
550 1.7 3.4 5.1 6.8 8.5 10.2 11.9 13.6 15.3 17.0 18.7 20.4
600 1.9 3.7 5.6 7.4 9.3 11.1 13.0 14.8 16.7 18.5 20.4 22.2
650 2.0 4.0 6.0 8.0 10.0 12.0 14.0 16.0 18.1 20.1 22.1 24.1
700 2.2 4.3 6.5 8.6 10.8 13.0 15.1 17.3 19.4 21.6 23.8 25.9
750 2.3 4.6 6.9 9.3 11.6 13.9 16.2 18.5 20.8 23.1 25.5 27.8
800 2.5 4.9 7.4 9.9 12.3 14.8 17.3 19.8 22.2 24.7 27.2 29.6
850 2.6 5.2 7.9 10.5 13.1 15.7 18.4 21.0 23.6 26.2 28.9 31.5
900 2.8 5.6 8.3 11.1 13.9 16.7 19.4 22.2 25.0 27.8 30.6 33.3
950 2.9 5.9 8.8 11.7 14.7 17.6 20.5 23.5 26.4 29.3 32.3 35.2
1000 3.1 6.2 9.3 12.3 15.4 18.5 21.6 24.7 27.8 30.9 34.0 37.0

 

Actual volume may vary due to type of materials, moisture content, amd compaction. We will not be held responsible in any way for product overage or shortage.

 

Base Material Calculations

The following formula is used to calculate amount of base material (3/4″ Crushed Gravel):
Step 1: Length x Width = Area (measured in square feet)
Step 2: Area ÷ 12″ x Inches of Base required = Total Cubic Feet of Base
Step 3: Cubic Feet of Base x 1.25 (compression factor) ÷ 27 = Yards of Base Needed

 

Bedding Sand Calculations

The following formula is used to calculate amount of Bedding Sand (clean, sharp, well graded, 1-1.5″):
Step 1: Length x Width = Area (measured in square feet)
Step 2: Area ÷ 12″ x 1″ (typical thickness) = Cubic Feet of Sand
Step 3: Cubic Feet of Sand ÷ 27 = Yards of Sand Needed

 

Edge Restraint Calculations

The following formula is used to calculate amount of Edging and Spikes:
Step 1: Two (2) Widths + Two (2) Lengths = Total Lineal Feet
Step 2: Total Lineal Feet ÷ 8′ = Total Pieces of Edging Required
Step 3: Total number of pieces required x 7 = Total number of Spikes required

 

Traditional Spacing Guidelines for Groundcover

1 YR COVERAGE 2 YR COVERAGE
Spacing on Center Sq Ft per Plant Spacing on Center Sq Ft per Plant
Ajuga 8″ 0.44 12″ 1.00
Euonymus ‘Coloratus’ 10″ 0.70 15″ 1.56
Pachysandra ‘Green Carpet’ 6″ 0.25 10″ 0.70
Sedum kamtschaticum 8″ 0.44 12″ 1.00
Vinca minor 8″ 0.44 12″ 1.00

Sq. Feet of Planting Area ÷ Sq. Feet per Plant = # of plants needed