Calculations

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Retaining Walls:

Total Lineal ft. ________ x Conversion Factor ________ x # of rows _______ = Total Bricks Needed

Pavers:

Project Dimensions: Length _____ x Width ______ = Total Square Ft. 
Lineal ft. of edge (for borders): (2 x Length) _____ + (2 x width) _____ = Total Lineal ft. of edge

# Pavers needed: Total sq. ft. of area ______ x Conversion Factor ______ = Total Pavers needed  
# Edge Stones needed: Total Lineal ft. of edge _____ x Conversion _____ = Total Edge stones needed
NOTE: Number of full edge & half edge stones will vary depending on the laying pattern.

Natural Stone/Flagstone:

1 Tonne will cover about 150 ft2 using a 1" thick stone or about 10 lbs per ft2
1 Tonne will cover about 40-50 ft2 using a 2-6" thick stone or about 20 lbs per ft2
Dry stacking will use about 100 lbs per sq. ft. of wall face

Conversion Factors:

PISA II or ROMAN PISA II			1.5
STACK STONE					1.71
CORNERSTONE					0.67
UNIT BLOK					3.7
HOLLAND						4.7
DOUBLE HOLLAND				2.32
DÉCOR (9" x 5.5")				3.6
DÉCOR EDGE					4.1
TILE STONE					1.03
COBBLE
   LARGE RECTANGLE			4.75
   SQUARES					7.12
   SMALL RECTANGLE			14.0
ROMAN EURO
   LARGE RECTANGLE (6" x 7")		3.52
   SQUARE (6" x 6")				4.25
   GRANDE (9" x 6"				2.32
ROMAN EURO CIRCLE
   3 layers of the bag will build a 5' diameter circle
   1 full bag (6 layers) will build an 8.5' diameter circle or two 5' diameter circles


To Calculate Cirlces:
Area (pi = 3.14) pi * R2 = area of circle OR Diameter x Diameter x .7864
ie: Diameter of circle is 12' --- 3.14 x 6 (radius) x 6 (radius) = 113 ft2 or --- 12 x 12 x .7864 = 113 ft2

Circumference (lineal footage around the outside of the circle) or 2 * pi * R
Ie: Diameter is 12' --- Circumference is 2 x 3.14 x 6 (radius of circle or ½ of diameter) = 38 lineal ft.