Quantities and Measures

Useful Calculations for Landscaping Projects

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When planning a landscaping project, the first step is determining the quantity of landscape materials you need.

How much mulch do I need?
How many teaspoons in a tablespoon?
How many plants are required to cover an area?

This page provides some helpful calculations for the number of plants it takes to plant a certain area, as well as the amount of landscaping mulch or decorative stone required to cover an area.

Bob also provides conversion charts on other weights and measures you may require in various landscape maintenance projects, such as calibrations for mixing concentrates and pesticides.


SHREDDED MULCH
Coverage of Shredded Mulch

Quantities can vary greatly due to the moisture content and type of mulch used. Bob's "experience" quantities relate to past projects using dry, double-shredded hardwood mulch, where 1 cubic yard covers 150 square feet at Bob's recommended depth of 1-1/2 inches.

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Depth (inches) / Quantity (cubic yards)
  per 100 square feet

1/2 inch / .22 yard
1 inch / .44 yard
1-1/2 inches / .66 yard
2 inches / .88 yard
2-1/2 inches / 1.10 yards
3 inches / 1.32 yards
3-1/2 inches / 1.54 yards
4 inches / 1.76 yards


TOPSOIL
Coverage of Topsoil

Quantities can vary due to the moisture content and type of topsoil. Quantities below assume that one cubic yard of topsoil weighs 2,250 pounds (lbs.) and one cubic foot of topsoil weighs 83 pounds.

Depth is shown in inches (in.)
Quantity is shown in cubic yards (cu. yds.) and pounds (lbs.)

Depth / Volume / Weight
  per 100 square feet

1 in. / .33 cu. yds. / 750 lbs.
2 in. / .66 cu. yds. / 1,500 lbs.
3 in. / 1 cu. yd. / 2,250 lbs.


TOPSOIL
Quantity for topdressing lawns

Experience tells us that the average amount of screened topsoil needed for lawn renovation projects is 2 cubic yards per 1,000 square feet.

Quantity is shown in cubic yards (cu. yds.) and pounds (lbs.) per 1,000 square feet (sq. ft.)

Lawn project / Cubic yards / Pounds
  per 1,000 sq. ft.

Skim coat / 1.5 cu. yds. / 3,375 lbs.
Filling low spots / 2 cu. yds. / 4,500 lbs.
Filling holes / 3 cu. yds. / 6,750 lbs.


STONE
Coverage of Gravel and Decorative Stone

Quantity shown in pounds (lbs.) and square feet (sq. ft.) indicating the approximate minimum amount of stone required to provide coverage.
One ton = 2,000 pounds (lbs.)

Diameter of stone / Coverage per 1-ton
  (minimum amount required for coverage)

2" (2b gravel) / 100 sq. ft.
2" to 6" (river rock mix) / 60 sq. ft.
3" river rock / 80 sq. ft.


MASS LANDSCAPE PLANTINGS COVERAGE
Required Plant Quantities per 100 square feet

Plant spacing / Number of plants
  per 100 square feet

6-inch centers / 400 plants
1-foot centers / 100 plants
2-foot centers / 25 plants
3-foot centers / 11 plants
4-foot centers / 6 plants


LIQUID MEASURE

3 teaspoons = 1 tablespoon
2 tablespoons = 1 ounce
8 ounces = 1 cup
2 cups = 1 pint
2 pints = 1 quart
4 quarts = 1 gallon
42 gallons = 1 barrel
2 barrels = 1 hogshead


METRIC LIQUID CONVERSIONS

1 milliliter = .0338 ounce
1 liter = 33.817 ounces
1 quart = .94625 liter
1 gallon = 3.785 liters


CUBIC MEASURE

1,728 cubic inches = 1 cubic foot
46,656 cubic inches = 1 cubic yard
27 cubic feet = 1 cubic yard
1 cubic yard = 3 ft x 3 ft x 3 ft
1 cord of wood = 128 cubic feet
1 board foot = 144 cubic inches 



AREA MEASURE

144 square inches = 1 square foot
9 square feet = 1 square yard
43,560 square feet = 1 acre
4,840 square yards = 1 acre
640 acres = 1 square mile


LINEAR MEASURE

4 inches = 1 hand
9 inches = 1 span
12 inches = 1 foot
36 inches = 1 yard
5-1/2 yards = 1 rod
40 rods = 1 furlong
320 rods = 1 mile
3 feet = 1 yard
1,320 feet = ¼ mile
5,280 feet = 1 mile
3 miles = 1 league


NAUTICAL MEASURE

6 feet = 1 fathom
6,028.2 feet = 1 nautical mile
1 nautical mph = 1 knot of speed


METRIC CONVERSIONS - LENGTH

1 inch = 2.54 centimeters
1 foot = 30.48 centimeters
1 mile = 1.609 kilometers
1 millimeter = .0394 inch
1 centimeter = .3937 inch
1 decimeter = 3.937 inches
1 meter = 39.37 inches
1 kilometer = 3,280 ft. 1 in. or .6214 mile


WEIGHT

2,000 pounds = 1 ton
1 gallon water = 8.3453 pounds


METRIC CONVERSIONS - WEIGHT

1 ounce = 28.353 grams
1 kilogram = 2.205 pounds


COUNTING & CIRCLES

12 units = 1 dozen
12 dozen = 1 gross

Circle Formulas:
p = 3.1416
circumference = p x diameter
diameter = circumference ÷ p
area of a circle = .785398 x diameter²


TEMPERATURE CONVERSIONS

32°F = 0°C
212°F = 100°C

Fahrenheit to Centigrade:
Subtract 32 degrees and multiply by 5/9 (.55)

Centigrade to Fahrenheit:
Multiply by 9/5 (1.8) and add 32 degrees.